Abtahi
Ali Abtahi, Canyon Country, CA US
Patent application number | Description | Published |
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20120091550 | SPECTROSCOPY AND SPECTRAL IMAGING METHODS AND APPARATUS - The invention pertains to a new type of standing wave filter in which the detector is located within the cavity, rather than outside the cavity and methods of manufacturing such a filter. | 04-19-2012 |
20120200852 | SPECTROSCOPY AND SPECTRAL IMAGING METHODS AND APPARATUS - The invention pertains to a new type of spectroscope comprising an array of Fabry-Perot cells having no moving parts and that can be fabricated inexpensively using semiconductor fabrication techniques. | 08-09-2012 |
Farnaz Abtahi, Fort Lee, NJ US
Patent application number | Description | Published |
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20150125041 | REINFORCEMENT LEARNING APPROACH TO CHARACTER LEVEL SEGMENTATION OF LICENSE PLATE IMAGES - Methods and systems for achieving accurate segmentation of characters with respect to a license plate image utilizing a reinforcement learning approach. A vehicle image can be captured by an image capturing unit and processed utilizing an ALPR (Automatic License Plate Recognition) unit. The reinforcement learning (RL) approach can be configured to initialize a segmentation agent with a starting location. A proper segmentation path (cuts) from top to bottom and from a darker to lighter area in a cropped license plate image can be identified by the segmentation agent during a training phase. Rewards can be provided based on a number of good and bad moves. The association between a current state and a sensory input with a preferred action can be learned by the segmentation agent at the end of the training phase. | 05-07-2015 |
Mohammad Abtahi, Montreal CA
Patent application number | Description | Published |
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20130272656 | Double-Sided Compression-Tuned Fiber Bragg Grating - A new type of tunable fiber Bragg grating (FBG) is proposed based on the compression of FBG from both sides. In this technique, the FBG is compressed from both sides simultaneously which provides the more uniform force distribution along the grating compared to the compression from one side. As a result, the grating period changes uniformly due to compression and the same spectral shape can be achieved over a wide spectrum. The double-sided compression technique represents a significant improvement over the prior wavelength tunable fiber grating techniques, especially for the long gratings. | 10-17-2013 |
20140123764 | Fiber Bragg Grating Pressure Sensor with Adjustable Sensitivity - A new type of optical pressure sensor with adjustable sensitivity is proposed based on the fiber Bragg grating (FBG). In this technique, the pressure changes the length of a metal bellows which is placed behind a spring. The fiber grating is fixed over the bellows between a fixed position and the connection point of bellows and spring. The wavelength change of FBG is caused by the change in the bellows length; however, the spring controls the total length expansion of the bellows. It will bring two benefits: first it is easy to change the pressure sensing range by changing the spring rate; and secondly the spring improves the linearity of the wavelength sift due to the pressure. The FBG is installed outside of the bellows and is not in contact with the material in which the pressure should be measured (gas or liquid) in contrast with other pressure sensors where the FBG is inside the bellows. This is an important issue because some materials could damage or change the characteristics of the fiber over the time. | 05-08-2014 |