Class / Patent application number | Description | Number of patent applications / Date published |
348251000 | Shading or black spot correction | 49 |
20080225141 | PHASE ADJUSTMENT DEVICE, PHASE ADJUSTMENT METHOD AND DIGITAL CAMERA - A brightness level detector detects a brightness level of the digital imaging signal for each of the plurality of pixels. A shading detector sets a group of pixel regions distant from each other in a horizontal direction in the imaging element and then detects whether or not shadings are generated in the analog imaging signal based on a difference between the brightness levels of the group of pixel regions. A timing adjuster adjusts a phase of a peak sample pulse for detecting a peak level of the analog imaging signal, a phase of a reference sample pulse for detecting a signal level used as a reference in the correlated double sampling executed when the digital imaging signal is generated and a phase of a horizontal transfer pulse in the imaging element based on outputs of the brightness level detector and the shading detector. | 09-18-2008 |
20080239117 | SHADING DETECTING METHOD AND SHADING DETECTING APPARATUS FOR CAMERA MODULE - An exemplary shading detecting method for a camera module is provided. In the method, a plurality of brightness values are measured from a plurality of predetermined regions of a stable rectangular image generated by the camera module. A plurality of brightness differences, each based on a comparison between a respective two of the brightness values, chosen from among the brightness values measured, are calculated. Each brightness difference is judged as to whether it exceeds a corresponding predetermined threshold. If at least one brightness difference is judged to exceed the corresponding threshold, the camera module is a rejected. A corresponding shading detecting apparatus, for facilitating the shading detecting method, is also provided. | 10-02-2008 |
20080239118 | Image processing apparatus, imaging apparatus and recording medium storing image processing medium - An image processing apparatus includes an input section, an adjusting section, and a correcting section. | 10-02-2008 |
20080273103 | TECHNIQUES FOR MODIFYING IMAGE FIELD DATA AS A FUNCTION OF RADIUS ACROSS THE IMAGE FIELD - A technique for modifying data of an image, such as can be implemented in a still camera or video recorder in order to correct for defects in its optical and/or electronic systems, includes generating data to modify the image as a function of radial position across it. A variation of the intensity across an image (lens shading) that appears in data from a two-dimensional detector is an example of an application of the technique. In order to make modifications to the data, positions of a two-dimensional raster scan pattern of an image sensor are converted to radial positions and this is then used to generate the modification data. The modification data is generated on the fly, at the same rate as the image data is being acquired, so that the modification takes place without slowing down data transfer from the image sensor. | 11-06-2008 |
20080291302 | Lens Shading Compensation Apparatus and Method, and Image Processor Using the Same - Disclosed are a lens shading compensation apparatus and a lens shading compensation method in an image sensor that compensate the difference in signal amplitude according to the position of pixels to preserve the quality of a primitive image. The lens shading compensation apparatus includes a pixel value analyzing part, an auto exposure value setting part, a central pixel detecting part, a table generating part, a pixel location calculating part, a mask image generating part and a compensation part. The above apparatus and method perform a color interpolation individually for red, green and blue, and then compensate a lens shading image for each color in accordance with its characteristics. Also the above apparatus and method can analyze and compensate a lens shading phenomenon without considering other colors or being interrupted by other colors. | 11-27-2008 |
20080297630 | IMAGING DEVICE AND IMAGING METHOD - According to an aspect of an embodiment, an imaging device has a black level reference generator for generating a reference value of a black level by calculating an average value of the accumulated pixel values for which the maximum values and/or minimum values has been replaced by the compensational pixel values, and an output compensator for compensating an output from the light sensitive pixels with the reference value of the black level. | 12-04-2008 |
20080297631 | SOLID-STATE IMAGING CIRCUIT AND CAMERA SYSTEM - A solid-state imaging circuit is formed by including an imaging unit and an image processing unit. The imaging unit is formed by including a pixel array in which plural pixel circuits performing a photoelectric conversion of an optical image image-formed by a photographic optical system are arranged. The image processing unit performs a first shading correction using plural first correction factors having extreme-value positions at positions different from a position corresponding to an optical axis of the photographic optical system, for a two-dimensional image obtained by the imaging unit. | 12-04-2008 |
20090002529 | METHOD AND APPARATUS FOR ROBUST IMAGE PROCESSING - A method and digital camera module is provided for taking a digital picture of an image. The digital camera module includes a plurality of light sensitive pixel elements, a first memory buffer, a second memory buffer and a controller. The controller is coupled to the plurality of light sensitive pixel elements and the first and second memory buffers and records a first plurality of pixel values representing an image by activating the plurality of light sensitive pixel elements in a first predetermined manner and stores the first plurality of pixel values in the first buffer. The controller then records a second plurality of pixel values representing the image by activating the plurality of light sensitive pixel elements in a second predetermined manner and stores the second plurality of pixel values in the second buffer. The controller further processes the first and second plurality of pixel values in a compressed domain to generate a third plurality of pixel values representative of the image. | 01-01-2009 |
20090051792 | DIGITAL SINGLE-LENS REFLEX CAMERA - A digital single-lens reflex camera includes a lens unit, a storage medium and a camera body. The lens unit has a photographing lens and an identification data memory for storing identification data to identify the photographing lens. The storage medium stores lens data that indicates shading characteristics of the photographing lens. The lens unit and the storage medium are detachably attached to the camera body. The camera body has an imaging device, a lens data reader, and an image corrector. The imaging device receives light transmitted through the photographing lens to generate an image corresponding to a subject. The lens data reader reads the lens data based on the identification data. An image corrector corrects an error in the image of the subject caused by shading, based on the lens data read by the lens data reader and imaging device data that indicates shading characteristics of the imaging device. | 02-26-2009 |
20090079854 | NON-UNIFORMITY CORRECTION OF IMAGES GENERATED BY FOCAL PLANE ARRAYS OF PHOTODETECTORS - Methods and apparatus for effecting a non-uniformity correction of images of a scene obtained with an array of detector elements are disclosed. A first image of the scene having a first integration period is acquired using the array of detector elements. A second image of the scene having a different integration period is acquired, and a corrected image of the scene is generated by computing a difference of the images. In some embodiments, the first and second images are images of substantially identical scenes. According to some embodiments, the images are infrared images. Optionally, the corrected image is subjected to further correction using pixel dependent correction coefficients, such as gain coefficients. Exemplary image detection elements include but are not limited to InSb detector elements and ternary detector elements, such as InAlSb, MCT (Mercury Cadmium Telluride), and QWIP technology (Quantum Well Infrared Photodiodes). In some embodiments, the detector elements are cooled to a temperature substantially equal to an atmospheric boiling point of liquid nitrogen. Alternatively, the detector elements are cooled to a temperature below an atmospheric boiling point of liquid nitrogen, or any other operating temperature. | 03-26-2009 |
20090160980 | GRADUATED-BASED DIGITAL IMAGE PROCESSING METHOD - A graduated processing method of digital image is adapted to a digital camera for immediately adjusting brightness in different regions of a shot digital image. The processing method includes the following steps. An image capturing device determines an image boundary of a digital image according to an image difference condition in the digital image. Then, a graduated layer is used in the digital image along a vertical direction of the image boundary, and a brightness difference in different regions of the digital image is adjusted. | 06-25-2009 |
20090167908 | IMAGE PICKUP APPARATUS, IMAGE DISPLAY APPARATUS, AND IMAGE DISPLAY SYSTEM - An image display system has a capsule endoscope for capturing an in-vivo image of a subject, a receiving device for receiving the in-vivo image from the capsule endoscope, and an image display apparatus for displaying a group of in-vivo images of the subject. The capsule endoscope has an imaging unit having a black region which optical rays do not reach in an effective pixel region contributing to image capture. By the imaging unit, an in-vivo image including the signal level of the black region is detected. The receiving device receives an image signal of the in-vivo image. The image display apparatus obtains an in-vivo image group from the receiving device. The image display apparatus does not display an in-vivo image in the in-vivo image group determined as an image influenced by fluctuations in the power source voltage but displays a stable in-vivo image which is not influenced by fluctuations in the power source voltage. | 07-02-2009 |
20090190010 | GAIN-COEFFICIENT ACQUIRING DEVICE AND IMAGE PROCESSING DEVICE HAVING SAME - An image processing device includes an initialization module, an optical black detection module, a calculation module, an image capturing module, a gain-value acquiring module, a gain adjusting module, and a pixel value adjusting module. The calculation module is configured for calculating the gain-coefficient. The image capturing module is configured for capturing an image of an object and acquiring the pixel value of each pixel of the image. The gain-value acquiring module is configured for acquiring a gain value according to the pixel values of the image. The gain adjusting module is configured for multiplying the gain value by the gain-coefficient to obtain an adjusted-gain value. The pixel value adjusting module is configured for multiplying the pixel values by the adjusted-gain value to adjust the pixel values. | 07-30-2009 |
20090219419 | Peripheral Light Amount Correction Apparatus, Peripheral Light Amount Correction Method, Electronic Information Device, Control Program and Readable Recording Medium - The present invention corrects the insufficient peripheral light amount due to the lens shading and correcting the non-uniformity of light amount at the periphery due to a distortion resulting from a precision of the lens or a poor mounting precision of the lens. A peripheral light amount correction circuit is structured by an image synchronization signal generation circuit, a coordinate conversion circuit and a luminance value correction computing circuit. An integrated value of luminance values is calculated at the coordinate conversion circuit to extract light amount information. Coordinate values to be input to the luminance value correction computing circuit are generated based on an integrated/averaged value of the light amount information. In the luminance value correction computing circuit, peripheral light amount correction functions are converted based on the input coordinate values from the coordinate conversion circuit to perform appropriate correction on the input image. | 09-03-2009 |
20090322915 | Speaker and Person Backlighting For Improved AEC and AGC - Regions of interest in video image capture for communication purposes are selected based on one or more inputs based on sound source localization, multi-person detection, and active speaker detection using audio and/or visual cues. Exposure and/or gain for the selected region are automatically enhanced for improved video quality focusing on people or inanimate objects of interest. | 12-31-2009 |
20100002103 | IMAGE PROCESSING APPARATUS, METHOD FOR CONTROLLING IMAGE PROCESSING APPARATUS, AND STORAGE MEDIUM - Foreign substance information including information on a position and size of a foreign substance in an imaging unit is acquired. When correcting a shadow of the foreign substance of the moving image data using the acquired foreign substance information and playing back the corrected moving image data, a selection is made whether to perform processing for correcting the shadow of the foreign substance of a frame based on the data size of the frame of the moving image data to be played back. | 01-07-2010 |
20100097504 | SHADING CORRECTING DEVICE AND IMAGING APPARATUS - A shading correcting device includes a correction-coefficient interpolation unit that calculates a color shading correction coefficient used at a position of a pixel at which the color shading correction coefficient is not set among pixels in an image signal by an interpolation process using a color shading correction coefficient set at a predetermined position. A color shading correction coefficient sent to the correction-coefficient interpolation unit is a color shading correction coefficient that is for a first color and corresponds to a pixel value of a second color adjacent to a pixel of the first color. | 04-22-2010 |
20100110241 | MULTI ILLUMINANT SHADING CORRECTION USING SINGULAR VALUE DECOMPOSITION - Methods and systems for determining shading correction coefficients of an imaging device. An inversion surface is determined based on an image captured by the imaging device. The inversion surface is approximated using the captured image and eigenvectors associated with singular values of the inversion surface, to form multiple reconstruction weights. A polynomial fit is applied to: i) the multiple reconstruction weights to determine a first set of polynomial coefficients and ii) the eigenvectors to determine a second set of polynomial coefficients. The first and second sets of polynomial coefficients are used to form the shading correction coefficients. | 05-06-2010 |
20100149387 | Method and Apparatus for Imaging - According to one embodiment, a shading correction circuit, which corrects for the influence of ambient light quantity shading, for input image light from three CCD sensors of R, G and B, based on a distance from the center of a screen. A shading correction circuit does not make correction for a maximum correction area which is out of a circle with a distance a from the central part of a screen, and corrects for the influence of ambient light quantity shading for a minimum correction area with a distance b from the central part of a screen, after calculating a square L | 06-17-2010 |
20100231764 | METHOD AND APPARATUS FOR POST NOISE REDUCTION BLACK LEVEL CORRECTION - Techniques for implementing a Black Level Correction (BLC) processing operation on image data signal pixel values that results in little to no nonlinearity in the dark areas of the image due to black noise clipping, and avoids reducing image quality or adding cost, are provided. Image data signal pixel values are caused to maintain black level while being operated on by image data signal processor circuits that precede a Noise Reduction (NR) processing operation, thus allowing the BLC processing operation to be executed after the NR processing operation. With black noise mostly removed, little to no nonlinearity in the dark areas of the image due to black noise clipping results from the BLC processing operation. | 09-16-2010 |
20110001854 | LENS SHADING CORRECTION FOR AUTOFOCUS AND ZOOM LENSES - In one embodiment of the invention, there is provided a method of correcting a captured image for lens shading artifacts, the captured image being captured by an image capture system, the method comprising: determining a function L(x, y) being a lens shading correction function to be applied to images captured by a lens of the image capture system in order to correct for lens shading artifacts; if a focal length associated with the captured image is less than a focal length associated with, the function L(x, y) then cropping the function L(x, y) based on the focal length associated with the captured image; and scaling the cropped function L(x, y) to a size of the tin-cropped Junction L(x, y). | 01-06-2011 |
20110025889 | TECHNIQUES OF MODIFYING IMAGE FIELD DATA BY EXTRAPOLATION - Techniques for modifying data of an image that can be implemented in a digital camera, video image capturing device and other optical systems are provided to correct for Image image shading variations appearing in data from a two-dimensional photo-sensor. These variations can be caused by imperfect lenses, non-uniform sensitivity across the photo-sensor, and internal reflections within a housing of the optical system, for example. In order to correct for these variations, a small amount of modification data is stored in a small memory within the camera or other optical system, preferably separate correction data for each primary color. Image data from individual pixels are corrected on the fly by interpolating individual pixel corrections from the stored modification data, at the same rate as the image data is being acquired, so that the correction takes place without slowing down data transfer of picture data from the image sensor. | 02-03-2011 |
20110096209 | SHADING CORRECTION METHOD, SHADING-CORRECTION-VALUE MEASURING APPARATUS, IMAGE CAPTURING APPARATUS, AND BEAM-PROFILE MEASURING APPARATUS - A shading correction method includes dividing a light receiving region of a solid-state image capturing element, in which pixels including light receiving elements are disposed, into areas; irradiating each of the areas with light, which is emitted from a light source serving as a reference, via an image forming optical system so that a size of a spot of the light corresponds to a size of the area; storing a sensitivity value of each of the areas in an area-specific-sensitivity memory; calculating shading correction values for all of the pixels of the solid-state image capturing element from the sensitivity values; storing the shading correction values for all of the pixels in a correction-value memory; and correcting signals of the individual pixels, which have been obtained using image capture by the solid-state image capturing element, using the corresponding shading correction values for the individual pixels. | 04-28-2011 |
20110187904 | Aperture shading correction - In camera systems with more than one aperture plane, light from different object points can be shaded by either the lens' pupil, the system's aperture or both. depending on pupil and aperture diameters, separation and camera system field of view. In an aperture shading correction (ASC) algorithm, the shading that results from the convolution of the lens' pupil function and its aperture function is determined over the image plane for any given pupil and aperture diameter and separation. A shading correction function is then calculated, and/or its parameters are determined, that will undo the adverse relative illumination degradations that result from the tandem pupil and aperture. This can be done in separate color planes. This can be done in tandem with standard lens shading correction that must also be corrected for (i.e., the lens shading correction (LSC) can be performed in the sensor for the case of no aperture shading, then the ASC multiples the LSC during aperture shading). Aperture shading will also impact SNR and MTF, and as such the tuning of these parameters will also benefit from ASC knowledge. | 08-04-2011 |
20110279715 | BLEMISH DETECTION SYTEM AND METHOD - An image blemish detecting system includes an image capturing module, a brightness adjusting module, and a blemish detecting module. The image capturing module captures an image. The brightness adjusting module adjusts the brightness of the image to obtain a second image having substantially uniform brightness. The blemish detecting module calculates a brightness ratio of each pixel in the second image, marks the pixels of which the brightness ratios are not smaller than a predetermined reference value as “1”, and marks the other pixels as “0”. The blemish detecting module calculates the quantity of the pixels in a continuous area in which all pixels are marked as “1”, and determines that the continuous area is a blemish if the quantity of the pixels in the continuous area is greater than or equal to the predetermined pixel quantity. | 11-17-2011 |
20110304752 | APPARATUS AND METHOD FOR CREATING LENS SHADING COMPENSATION TABLE SUITABLE FOR PHOTOGRAPHY ENVIRONMENT - An apparatus and a method for creating a lens shading compensation table suitable for a photography environment are provided. A photography environment condition determining unit determines photography environment conditions of an image input from a camera module. A compensation parameter detecting unit detects compensation parameters corresponding to the determined photography environment conditions. A compensation table creating unit creates a lens shading compensation table suitable for the determined photography environment conditions by applying the detected compensation parameters to a predetermined reference lens shading compensation table. | 12-15-2011 |
20120008019 | Shadow Removal in an Image Captured by a Vehicle-Based Camera Using an Optimized Oriented Linear Axis - A method is provided for removing an illumination generated shadow in a captured image. Each pixel of the captured input image is plotted on a two dimensional logarithmic graph. A linear axis for the plurality of color sets is determined that is substantially orthogonal to a respective illumination direction of each respective color set. A log-chromaticity value of each plotted pixel is projected on the axis. An orientation of the linear axis is selected to minimize an illumination effect and provide optimum separation between each of the respective color sets on the linear axis. Edges in the input image and illumination invariant image domain are identified. The identified edges of the input image are compared to identify edges in the illumination invariant image domain. A determination is made whether a shadow edge is present in response to the comparison. A shadow-reduced image is generated for scene analysis by a vehicle vision-based system. | 01-12-2012 |
20120008020 | Shadow Removal in an Image Captured by a Vehicle Based Camera Using a Non-Linear Illumination-Invariant Kernel - A method is provided for removing an illumination generated shadow in a captured image. An image is captured by an image capture device. Each pixel of the captured image is represented by a respective color value in a logarithmic graph. A non-linear illumination-invariant kernel is determined. An illumination direction for each respective color set is determined in the logarithmic graph that is orthogonal to the non-linear illumination-invariant kernel. A log-chromaticity value of each plotted pixel is projected on the non-linear illumination-invariant kernel. Edges are identified in the input image. Edges are identified in the illumination-invariant image domain. The identified edges are compared. A determination is made whether a shadow is present in response to an edge identified in the input image and an absence of a correlating edge in the illumination-invariant image domain. A shadow-reduced image is generated for scene analysis by a vehicle vision-based system. | 01-12-2012 |
20120008021 | Shadow Removal in an Image Captured by a Vehicle-Based Camera for Clear Path Detection - A method for is provided for creating a shadow-reduced image from a captured image for distinguishing a clear path of travel. Each pixel of a captured input image is plotted according to a two dimensional logarithmic graph. A specific color set relating to an associated color value of a clear path. A linear illumination-invariant axis is determined as a function of the specific color set. An illumination direction for the linear illumination-invariant axis is determined. A log-chromaticity value of each plotted pixel of the specific color set is projected on the axis. Edges in the input image and the illumination-invariant image domain are identified. The identified edges of the input image are compared to identify edges in the illumination-invariant image domain. A determination is made whether a shadow edge is present in response to comparing the edges. A shadow-reduced image is generated for scene analysis by a vehicle vision-based system. | 01-12-2012 |
20120075508 | IMAGE PROCESSING APPARATUS, METHOD FOR CONTROLLING IMAGE PROCESSING APPARATUS, AND STORAGE MEDIUM - Foreign substance information including information on a position and size of a foreign substance in an imaging unit is acquired. When correcting a shadow of the foreign substance of the moving image data using the acquired foreign substance information and playing back the corrected moving image data, a selection is made whether to perform processing for correcting the shadow of the foreign substance of a frame based on the data size of the frame of the moving image data to be played back. | 03-29-2012 |
20120092533 | IMAGING APPARATUS AND IMAGING METHOD - An imaging apparatus in which a matrix of pixels converts light into electric charge. The pixels are disposed in an optically black area that receives no light so as to output optically black signals and in an effective pixel area that receives incident light. An analog amplifier applies predetermined gain to the electric charge read from the pixels in the effective pixel area. A vertical line detector calculates a correction value to remove vertical line-shaped fixed pattern noise. A vertical line corrector adds each of the correction values to the corresponding effective pixel signal to remove the vertical line-shaped fixed pattern noise; and a multiplier multiplies the corrected pixel signals by the digital gain so that the ouput pixel signal contains no vertical line-shaped fixed pattern noise caused by the digital gain. | 04-19-2012 |
20120236186 | CAMERA MODULE, IMAGE PROCESSING APPARATUS, AND IMAGE PROCESSING METHOD - According to one embodiment, a camera module includes a second imaging optical system and an image processing section. The second imaging optical system forms an image piece. The image processing section has at least one of an alignment adjustment section, a resolution restoration section, and a shading correction section and has a stitching section. The stitching section joins the image pieces, subjected to at least one of alignment adjustment, resolution restoration, and shading correction, together to form a subject image. | 09-20-2012 |
20130002912 | METHOD OF CALCULATING LENS SHADING COMPENSATION FACTOR AND METHOD AND APPARATUS FOR COMPENSATING FOR LENS SHADING BY USING THE METHOD - Provided is a method of calculating a compensation factor to compensate for lens shading due to the characteristics of an image capturing device, which requires a small amount of memory. A reference image is captured, and a compensation factor is calculated using the characteristics of a lens shading pattern of the captured reference image. A distribution of pixel values is approximated using an exponential spline function, and a compensation factor is calculated using the approximated distribution. In addition, a method and an apparatus for compensating for lens shading by using a calculated compensation factor are provided. | 01-03-2013 |
20130120620 | IMAGE PROCESSING APPARATUS AND IMAGE PROCESSING METHOD - An image processing apparatus has an input unit for inputting an image captured by an image sensor, a shading correction amount calculation unit for calculating per pixel a shading correction amount to be applied to the image inputted from the input unit, a γ correction gain calculation unit for calculating a γ correction gain depending on the shading correction amount and pixel values of the image sensor pixels, and a gain correction unit for applying gain correction to the pixel values based on the γ correction gain, wherein shading correction and γ correction are performed simultaneously by the gain correction with the gain correction unit. | 05-16-2013 |
20130321678 | SYSTEMS AND METHODS FOR LENS SHADING CORRECTION - Systems and methods for correcting intensity drop-offs due to geometric properties of lenses are provided. In one example, a method includes receiving an input pixel of the image data, the image data acquired using an image sensor. A color component of the input pixel is determined. A gain grid is determined by pointing to the gain grid in external memory. Each of the plurality of grid points is associated with a lens shading gain selected based upon the color of the input pixel. A nearest set of grid points that enclose the input pixel is identified. Further, a lens shading gain is determined by interpolating the lens shading gains associated with each of the set of grid points and is applied to the input pixel. | 12-05-2013 |
20150042849 | IMAGE CAPTURING APPARATUS AND METHOD OF CONTROLLING THE SAME - An image capturing apparatus includes an image sensor, a shutter, a composition unit configured to perform continuous shooting of a plurality of exposure images by the image sensor and compose the plurality of images, a driving unit configured to drive the shutter and the image sensor to capture a first black image before the continuous shooting while the image sensor is shielded from light and to capture a second black image after the continuous shooting while the image sensor is shielded from light, and an image processing unit configured to perform first noise reduction processing using the first black image and second noise reduction processing using the second black image for each of a plurality of images obtained by the continuous shooting or an image obtained by composing the plurality of images. | 02-12-2015 |
20150070537 | Lens Shading Modulation - This disclosure pertains to systems, methods, and computer readable media for performing lens shading correction (LSC) operations that modulate gains based on scene lux level and lens focus distance. These gains compensate for both color lens shading (i.e., the deviation between R, G, and B channels) and vignetting (i.e., the drop off in pixel intensity around the edges of an image). As scene illuminance increases, the sensor captures more signal from the actual scene, and the lens shading effects begin to appear. To deal with the situation, the lens shading gains are configured to adaptively ‘scale down’ when scene lux approaches zero and ‘scale up’ when scene lux changes from near zero to become larger. The lens shading gain may also be modulated based on the focus distance. For optical systems without zoom, the inventors have discovered that the amount of lens shading fall off changes as focus distance changes. | 03-12-2015 |
20150077599 | LENS SHADING CORRECTION METHOD AND IMAGE SIGNAL PROCESSOR FOR PERFORMING THE SAME - A lens shading correction method for pixels of an image is provided. The method includes the steps of: inputting coordinates of the pixels and setting a threshold range on the image; providing a first gain function and a second gain function, each relating the coordinates of the pixels to brightness gains; performing the first gain function on the pixels located at the interior of the threshold range for calculating the brightness gains; and performing a blended gain function on the pixels located at the exterior of the threshold range for calculating the brightness gains, wherein the blended gain function is the combination of the first gain function and the second gain function. | 03-19-2015 |
20150124128 | LENS SHADING CORRECTION SYSTEM - A lens shading correction (LSC) system includes an illuminant estimator configured to calculate at least one spectral association-measurement of a current frame according to pixel data of an LSC circuit, and then to correlate the at least one calculated spectral association-measurement with spectral association-measurements of a plurality of pre-defined illuminants to determine at least one correlated illuminant. An LSC parameter generator retrieves at least one set of pre-calibrated LSC parameters from a pre-calibrated LSC parameter memory. The LSC parameter generator generates a set of LSC parameters based on the at least one retrieved set of pre-calibrated LSC parameters according to the at least one correlated illuminant. | 05-07-2015 |
20150130972 | Self-Adaptive Lens Shading Calibration and Correction - A CMOS imaging system is capable of self-calibrating to correct for lens shading by use of images captured in the normal environment of use, apart from a production calibration facility. | 05-14-2015 |
20150296127 | FOCUS DETECTING UNIT, FOCUS DETECTING METHOD, IMAGE PICKUP APPARATUS, AND IMAGE PICKUP SYSTEM - A focus detecting unit that includes a corrector configured to correct a signal output from an image sensor using a first shading correction value when the half-mirror is retreated from an optical path, and to correct the signal using a second shading correction value different from the first shading correction value when the half-mirror is inserted into the optical path, and a focus detector configured to provide a focus detection based on the signal corrected by the corrector. | 10-15-2015 |
20150312499 | IMAGING SYSTEMS AND METHODS FOR MITIGATING PIXEL DATA QUANTIZATION ERROR - An image sensor may have an array of pixels and readout circuitry. The array may include image pixels that generate signals in response to image light and reference pixels that generate signals in response to electrical noise. The readout circuitry may obtain first pixel values from the image pixels and may obtain second pixel values from the reference pixels. The readout circuitry may generate an extended precision pixel value based on the second pixel values that have an extended bit width relative to the each of the second pixel values. The readout circuitry may generate multiple dithered correction values by adding randomized sequences of least significant bits to the extended precision pixel value. The readout circuitry may mitigate visible quantization error and noise such as row-correlated and column-correlated noise in the final image by subtracting the dithered correction values from corresponding first pixel values. | 10-29-2015 |
20150334280 | TERMINAL DEVICE, METHOD FOR ACQUIRING DRAWING TARGET, AND COMPUTER-READABLE RECORDING MEDIUM - A terminal device, comprising: a capturing unit capturing a subject; a light emitting unit; a display unit, a processor, and a storage unit containing a program that causes the processor to execute a process of acquiring a drawing target drawn by a user from a captured image of the subject including the drawing target and causing the drawing target to be displayed on a screen of the display unit, the program causes the processor to execute; controlling the light emitting unit to emit the light when the capturing unit captures the subject according to the user's operation, acquiring the captured image that is obtained by capturing the subject irradiated with the light emitted from the light emitting unit, performing image correction corresponding to a brightness distribution of the light emitted from the light emitting unit on the captured image, and extracting the drawing target from the captured image acquired. | 11-19-2015 |
20150365576 | IMAGE CAPTURING DEVICE AND METHOD FOR SHADING COMPENSATION THEREOF - A shading compensation method of an image capturing device, adapted to an image capturing device having a primary lens, a secondary lens, and a diffuser as well as pre-storing a primary-secondary lenses table and a secondary lens-diffuser table, includes the following steps. First, the secondary lens is covered by the diffuser. A scene is simultaneously captured by the primary lens and the secondary lens covered by the diffuser so as to generate a primary image and a diffused image. Next, according to the primary image and the diffused image, a shading compensation table corresponding to the scene is constructed by using the primary-secondary lenses table and the secondary lens-diffuser table. A shading compensation process is then performed on the primary image according to the shading compensation table so as to generate a compensated image. | 12-17-2015 |
20160028975 | DEVICE AND METHOD FOR COMPRESSING/DECOMPRESSING LENS SHADING COMPENSATION COEFFICIENT - A lens shading compensation coefficient compression device includes: a first differential block suitable for calculating a lens shading compensation coefficient between color channels and removing redundancy between the color channels; a second differential block suitable for calculating a lens shading compensation coefficient within color channels and removing redundancy within the color channels; and an entropy coding block suitable for performing entropy coding on remaining lens shading compensation coefficients and compressing the lens shading compensation coefficients. | 01-28-2016 |
20160191824 | IMAGE PROCESSING DEVICE, IMAGING DEVICE, IMAGE PROCESSING METHOD, AND IMAGE PROCESSING PROGRAM - The invention provides an image processing device, an imaging device, an image processing method, and a non-transitory computer readable recording medium recorded with an image processing program that can instantaneously correct shading characteristics. A correction unit calculates a shading characteristic correction coefficient based on a first comparison result and a second comparison result and corrects the shading characteristics of a subsequent frame based on the calculated coefficient. The first comparison result indicates the result of the comparison between a phase difference image and a normal image included in a preceding frame acquired first a pair of frames acquired at different times. The second comparison result indicates the result of the comparison between a phase difference image and a normal image included in the subsequent frame. A control unit directs a display device to continuously display the subsequent frame, of which the shading characteristics have been corrected, as a moving image. | 06-30-2016 |
20160198105 | IMAGE PROCESSING DEVICE, IMAGING DEVICE, IMAGE PROCESSING METHOD, AND IMAGE PROCESSING PROGRAM | 07-07-2016 |
20160255291 | IMAGE PICKUP APPARATUS AND IMAGE PICKUP SYSTEM | 09-01-2016 |
20220141407 | CMOS IMAGE SENSOR WITH IMAGE BLACK LEVEL COMPENSATION AND METHOD - An image sensor has an image sensor array and circuit design employing a method of black level compensation to address image shading related to global exposure image capture and rolling row by row readout schemes. An image sensor including the invented black level compensation pixel array and method may be incorporated within a digital camera. | 05-05-2022 |