Patents by Inventor Chang-Che Tsai
Chang-Che Tsai has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11651479Abstract: An image processing method and an image processing device is provided. The processing device comprises memory and a processor configured to receive a frame of color filtered image data comprising pixels which are spatially multiplexed according to a plurality of different light exposures, resample the color values as different frames of pixels for the plurality of different light exposures, fuse the resampled frames of pixels for the plurality of different light exposures into a frame of pixels according to a HDR format and color interpolate the fused frame of pixels. The processor is configured to interpolate, for each resampled frame, missing pixel color values based on the color values of adjacent resampled pixels in a same resampled frame. The color interpolated fused frame of pixels is processed in an image processing pipeline and converted to a YUV color space.Type: GrantFiled: December 22, 2020Date of Patent: May 16, 2023Assignee: Advanced Micro Devices, Inc.Inventors: Chang-Che Tsai, Tsung-Han Chiang
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Patent number: 11417151Abstract: A processing device comprises a memory configured to store data and a processor. The processor is configured to control an exposure timing of a rolling shutter image sensor and an IR illumination timing of an object, by an IR light emitter, by switching between a first operation mode and a second operation mode. In the first operation mode, a sequence of video frames, each having a plurality of pixel lines, comprises a frame in which each pixel line is exposed to IR light emitted by the IR light emitter; a frame which is partially exposed to the IR light and a frame in which no pixel line is exposed to the IR light. In the second operation mode, alternating video frames of the sequence comprise one of a frame in which each pixel line is exposed to the IR light and a frame in which no pixel line is exposed to the IR light.Type: GrantFiled: December 20, 2019Date of Patent: August 16, 2022Assignee: ADVANCED MICRO DEVICES, INC.Inventors: Chang-Che Tsai, Chih-Wei Li, Po-Min Wang, Yang Wang
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Publication number: 20220198623Abstract: An image processing method and an image processing device is provided. The processing device comprises memory and a processor configured to receive a frame of color filtered image data comprising pixels which are spatially multiplexed according to a plurality of different light exposures, resample the color values as different frames of pixels for the plurality of different light exposures, fuse the resampled frames of pixels for the plurality of different light exposures into a frame of pixels according to a HDR format and color interpolate the fused frame of pixels. The processor is configured to interpolate, for each resampled frame, missing pixel color values based on the color values of adjacent resampled pixels in a same resampled frame. The color interpolated fused frame of pixels is processed in an image processing pipeline and converted to a YUV color space.Type: ApplicationFiled: December 22, 2020Publication date: June 23, 2022Applicant: Advanced Micro Devices, Inc.Inventors: Chang-Che Tsai, Tsung-Han Chiang
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Publication number: 20210182582Abstract: A processing device comprises a memory configured to store data and a processor. The processor is configured to control an exposure timing of a rolling shutter image sensor and an IR illumination timing of an object, by an IR light emitter, by switching between a first operation mode and a second operation mode. In the first operation mode, a sequence of video frames, each having a plurality of pixel lines, comprises a frame in which each pixel line is exposed to IR light emitted by the IR light emitter; a frame which is partially exposed to the IR light and a frame in which no pixel line is exposed to the IR light. In the second operation mode, alternating video frames of the sequence comprise one of a frame in which each pixel line is exposed to the IR light and a frame in which no pixel line is exposed to the IR light.Type: ApplicationFiled: December 20, 2019Publication date: June 17, 2021Applicant: Advanced Micro Devices, Inc.Inventors: Chang-Che Tsai, Chih-Wei Li, Po-Min Wang, Yang Wang
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Patent number: 8786719Abstract: A sensor array module with wide angle for creating a composite image includes a first image sensor, a second image sensor, a storage unit and a processor. The first image sensor is for capturing a first image. The second image sensor is for capturing a second image and has a relative spatial relationship with respective to the first image sensor. The storage unit stores at least one transformation matrix obtained according to the relative spatial relationship between the first and the second image sensors. The processor combines the first image and the second image by using the transformation matrix to create the composite image. The present invention also provides an image calibration method, an operation method and an application for a sensor array module with wide angle.Type: GrantFiled: February 7, 2013Date of Patent: July 22, 2014Assignee: Pixart Imaging Inc.Inventors: Tzu Yi Chao, Hsin Chia Chen, Chih Hsin Lin, Ren Hau Gu, Chang Che Tsai
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Patent number: 8638398Abstract: A cursor control method for controlling a cursor on an image display includes: providing at least two reference points for generating light of a predetermined spectrum and defining a predetermined area; providing an image sensor pointing inside the predetermined area; receiving the light of the predetermined spectrum by the image sensor to form a digital image; identifying positions and shapes of the images of the reference points on the digital image to form a first parameter; performing distance and angle compensations on the first parameter; moving the aiming point of the image sensor inside the predetermined area to form a second parameter; and calculating an displacement of the images of the reference points on the digital image according to the compensated first and second parameters so as to accordingly control the cursor. The present invention further provides a cursor control apparatus.Type: GrantFiled: January 13, 2012Date of Patent: January 28, 2014Assignee: PixArt Imaging, Inc.Inventors: Tzu Yi Chao, Meng Tsung Wu, Hsin Chia Chen, Chih Hsin Lin, Chang Che Tsai, Chao Chien Huang, Yi Fang Lee
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Patent number: 8384789Abstract: A sensor array module with wide angle for creating a composite image includes a first image sensor, a second image sensor, a storage unit and a processor. The first image sensor is for capturing a first image. The second image sensor is for capturing a second image and has a relative spatial relationship with respective to the first image sensor. The storage unit stores at least one transformation matrix obtained according to the relative spatial relationship between the first and the second image sensors. The processor combines the first image and the second image by using the transformation matrix to create the composite image. The present invention also provides an image calibration method, an operation method and an application for a sensor array module with wide angle.Type: GrantFiled: July 21, 2009Date of Patent: February 26, 2013Assignee: Pixart Imaging Inc.Inventors: Tzu Yi Chao, Hsin Chia Chen, Chih Hsin Lin, Ren Hau Gu, Chang Che Tsai
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Publication number: 20120113000Abstract: A cursor control method for controlling a cursor on an image display includes: providing at least two reference points for generating light of a predetermined spectrum and defining a predetermined area; providing an image sensor pointing inside the predetermined area; receiving the light of the predetermined spectrum by the image sensor to form a digital image; identifying positions and shapes of the images of the reference points on the digital image to form a first parameter; performing distance and angle compensations on the first parameter; moving the aiming point of the image sensor inside the predetermined area to form a second parameter; and calculating an displacement of the images of the reference points on the digital image according to the compensated first and second parameters so as to accordingly control the cursor. The present invention further provides a cursor control apparatus.Type: ApplicationFiled: January 13, 2012Publication date: May 10, 2012Applicant: PIXART IMAGING INC.Inventors: Tzu Yi CHAO, Meng Tsung WU, Hsin Chia CHEN, Chih Hsin LIN, Chang Che TSAI, Chao Chien HUANG, Yi Fang LEE
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Patent number: 8169550Abstract: A cursor control method for controlling a cursor on an image display includes: providing at least two reference points for generating light of a predetermined spectrum and defining a predetermined area; providing an image sensor pointing inside the predetermined area; receiving the light of the predetermined spectrum by the image sensor to form a digital image; identifying positions and shapes of the images of the reference points on the digital image to form a first parameter; performing distance and angle compensations on the first parameter; moving the aiming point of the image sensor inside the predetermined area to form a second parameter; and calculating an displacement of the images of the reference points on the digital image according to the compensated first and second parameters so as to accordingly control the cursor. The present invention further provides a cursor control apparatus.Type: GrantFiled: December 27, 2007Date of Patent: May 1, 2012Assignee: Pixart Imaging Inc.Inventors: Tzu Yi Chao, Meng Tsung Wu, Hsin Chia Chen, Chih Hsin Lin, Chang Che Tsai, Chao Chien Huang, Yi Fang Lee
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Patent number: 8102282Abstract: An encoding and decoding method for a microdot matrix includes the steps of: forming a plurality of microdots by encoding based on Reflected Gray Codes in a data region included in each of a plurality of microdot blocks included in a microdot matrix, wherein the microdots corresponding to lower order bits of the Reflected Gray Codes are formed as the outmost microdots in the data region; scanning the microdot matrix to fetch an image and recognizing a microdot group in the date region of each microdot block in the image; and decoding a corresponded coordinate of the image on the microdot matrix according to the microdot block to which the microdot group containing lower order bits of the Reflected Gray Codes belongs.Type: GrantFiled: March 9, 2010Date of Patent: January 24, 2012Assignee: Pixart Imaging Inc.Inventors: Shou Te Wei, Chang Che Tsai
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Patent number: 7953153Abstract: A motion estimation method for a succession of frames in a digital coding system includes: a) with reference to a first block in a first frame, searching a second frame for a second block that corresponds to the first block; and b) estimating a motion vector of the first block on the basis of the second block in the second frame; wherein step a) includes: a1) forming a first initial search range including a virtual rhombus-shaped pattern substantially centered at a pre-determined block, and a2) expanding progressively outward a second initial search range based on the virtual rhombus-shaped pattern.Type: GrantFiled: March 1, 2006Date of Patent: May 31, 2011Assignee: PixArt Imaging IncorporationInventors: Chang-Che Tsai, Chih-Hsin Lin, Yi-Fang Lee, Tzu-Yi Chao
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Patent number: 7864837Abstract: A motion estimation method for a succession of frames in a digital coding system includes: with reference to a first block in a first frame, searching a second frame for a second block that corresponds to the first block; and estimating a motion vector of the first block with respect to the second block in the second frame. Blocks in the second frame are searched according to a distance-weighted search sequence starting from a candidate origin block. In view of the radiating characteristics of motion vectors, the distance-weighted search sequence can save unnecessary search time.Type: GrantFiled: March 1, 2006Date of Patent: January 4, 2011Assignee: PixArt Imaging IncorporationInventors: Chang-Che Tsai, Chih-Hsin Lin, Yi-Fang Lee, Tzu-Yi Chao
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Patent number: 7857703Abstract: A method for coordinate generation to be implemented using an orientation device includes the steps of: providing at least three reference marks on a target; aiming the orientation device at an initial point on the target, and operating the orientation device such that the sensor is able to capture an image of the target that contains at least one of the reference marks; correlating a coordinate space of the orientation device with a coordinate space of the target; aiming the orientation device at a target point on the target, and operating the orientation device such that the sensor is able to capture an image of the target that contains the reference marks; and determining relative coordinates of the target point with reference to the established coordinate space relation and the captured image. An orientation device that performs the method is also disclosed.Type: GrantFiled: March 28, 2006Date of Patent: December 28, 2010Assignee: FixArt Imaging IncorporatedInventors: Chih-Hsin Lin, Hsin-Chia Chen, Chang-Che Tsai, Yi-Fang Lee, Hsuan-Hsien Lee, Tzu-Yi Chao
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Publication number: 20100231420Abstract: An encoding and decoding method for a microdot matrix includes the steps of: forming a plurality of microdots by encoding based on Reflected Gray Codes in a data region included in each of a plurality of microdot blocks included in a microdot matrix, wherein the microdots corresponding to lower order bits of the Reflected Gray Codes are formed as the outmost microdots in the data region; scanning the microdot matrix to fetch an image and recognizing a microdot group in the date region of each microdot block in the image; and decoding a corresponded coordinate of the image on the microdot matrix according to the microdot block to which the microdot group containing lower order bits of the Reflected Gray Codes belongs.Type: ApplicationFiled: March 9, 2010Publication date: September 16, 2010Applicant: PIXART IMAGING INC.Inventors: Shou Te WEI, Chang-Che TSAI
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Patent number: 7702514Abstract: A method for audio encoding includes: analyzing an audio frame using a psychoacoustic model to obtain a corresponding masking curve and window information; transforming the audio frame according to the window information to obtain a spectrum, and dividing the spectrum into a plurality of frequency sub-bands; estimating a scale factor for each frequency sub-band; quantizing the frequency sub-bands; encoding the quantized frequency sub-bands; and packing the encoded frequency sub-bands and side information into an audio stream. Each scale factor is estimated based on a quantizable audio intensity of each frequency sub-band, which is adjusted according to a cumulative total amount of buffer space used for storing the encoded frequency sub-bands and an amount of buffer space used for storing a previously encoded audio frame, and a mean of intensities of all signals in the corresponding frequency sub-band and spectrum position of the corresponding frequency sub-band.Type: GrantFiled: March 28, 2006Date of Patent: April 20, 2010Assignee: Pixart Imaging IncorporationInventors: Chih-Hsin Lin, Hsin-Chia Chen, Chang-Che Tsai, Tzu-Yi Chao
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Publication number: 20100080298Abstract: A weighting function (WF) is previously provided to model the number of search points of a pattern search. However, WF fails to properly describe the behavior of the genetic pattern search algorithms due to some over-simplifications in their models. Therefore, a refined weighting function (RWF) is provided to more accurately describe both genetic and non-genetic pattern searches. Moreover, based on the understanding to RWF, two momentum-directed genetic search algorithms are further provided. These new algorithms check the possible mutations according to their likelihood to the preceding successful mutations and further accelerate the previous genetic pattern searches.Type: ApplicationFiled: June 24, 2009Publication date: April 1, 2010Inventors: Hsueh-Ming Hang, Tzu-Yi Chao, Chang-Che Tsai
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Publication number: 20100020201Abstract: A sensor array module with wide angle for creating a composite image includes a first image sensor, a second image sensor, a storage unit and a processor. The first image sensor is for capturing a first image. The second image sensor is for capturing a second image and has a relative spatial relationship with respective to the first image sensor. The storage unit stores at least one transformation matrix obtained according to the relative spatial relationship between the first and the second image sensors. The processor combines the first image and the second image by using the transformation matrix to create the composite image. The present invention also provides an image calibration method, an operation method and an application for a sensor array module with wide angle.Type: ApplicationFiled: July 21, 2009Publication date: January 28, 2010Applicant: PIXART IMAGING INC.Inventors: Tzu Yi CHAO, Hsin Chia CHEN, Chih Hsin LIN, Ren Hau GU, Chang Che TSAI
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Publication number: 20080158436Abstract: A cursor control method for controlling a cursor on an image display includes: providing at least two reference points for generating light of a predetermined spectrum and defining a predetermined area; providing an image sensor pointing inside the predetermined area; receiving the light of the predetermined spectrum by the image sensor to form a digital image; identifying positions and shapes of the images of the reference points on the digital image to form a first parameter; performing distance and angle compensations on the first parameter; moving the aiming point of the image sensor inside the predetermined area to form a second parameter; and calculating an displacement of the images of the reference points on the digital image according to the compensated first and second parameters so as to accordingly control the cursor. The present invention further provides a cursor control apparatus.Type: ApplicationFiled: December 27, 2007Publication date: July 3, 2008Applicant: PIXART IMAGING INC.Inventors: Tzu Yi CHAO, Meng Tsung Wu, Hsin Chia Chen, Chih Hsin Lin, Chang Che Tsai, Chao Chien Huang, Yi Fang Lee
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Publication number: 20080137746Abstract: A method of determining performance of block motion estimation procedures, including specific search patterns is disclosed. The patterns are based on genetic competition between paired coordinate points. An evaluation of a block matching cost is used to identify a survivor between the two selected points. Models are also provided for estimating performances of new search algorithms and image sequences.Type: ApplicationFiled: May 23, 2007Publication date: June 12, 2008Inventors: Chang-Che Tsai, Tzu-Yi Chao, Hsueh-Ming Hang
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Publication number: 20080130749Abstract: A block motion estimation search method and related search pattern for determining motion vectors of varying image data is disclosed. The patterns are based on genetic competition between paired coordinate points. An evaluation of a block matching cost is used to identify a survivor between the two selected points. Models are also provided for estimating performances of new search algorithms and image sequences.Type: ApplicationFiled: May 23, 2007Publication date: June 5, 2008Inventors: Chang-Che Tsai, Tzu-Yi Chao, Hsueh-Ming Hang