1
Chong U Lee: Adaptive block size image compression method and system. Qualcomm Incorporated, April 21, 1992: US05107345 (236 worldwide citation)

An image compression system and method for compressing image data for transmission. Each block and corresponding sub-blocks of pixel data is subjected to a discrete cosine transform (DCT) operation. Varying levels of sub-blocks of resulting corresponding transform coefficients are selected for const ...


2
Teruhiko Suzuki, Yoichi Yagasaki, Tatsuya Sudo, Toru Okazaki: Methods and apparatus for preventing rounding errors when transform coefficients representing a motion picture signal are inversely transformed. Sony Corporation, Ian Hardcastle, Limbach & Limbach, January 2, 1996: US05481553 (202 worldwide citation)

Mismatch errors occur in the local decoder of a MPEG-standard compressor for a motion picture signal, and in an MPEG-standard expander for a compressed motion picture signal. This is because of the lack of a standard for rounding results of *0.5 (* is an integer) obtained when a set of transform coe ...


3
Chong U Lee: Adaptive block size image compression method and system. Qualcomm Incorporated, Russell B Miller, Sean English, September 19, 1995: US05452104 (181 worldwide citation)

In an adaptive block size image compression method and system for compressing image data, a respective method and system for further compressing the image data for transmission. Each block and corresponding sub-blocks of pixel data is subjected to a discrete cosine transform (DCT) operation. Varying ...


4
Cheng Tie Chen: Adaptive transform coding using variable block size. Bell Communications Research, Leonard Charles Suchyta, Joseph Giordano, August 31, 1993: US05241395 (169 worldwide citation)

An adaptive transform coding algorithm for a still image utilizes a quadtree based variable block size discrete cosine transform to achieve a better tradeoff between bit rate and image quality. The choice of appropriate block size is made according to a mean based decision rule which can discriminat ...


5
Yasuyuki Nakajima: Noise reduction apparatus for reducing noise in decoding of moving picture sequence. Kokusai Denshin Denwa Kabushiki Kaisha, Westman Champlin & Kelly P A, March 11, 1997: US05610729 (167 worldwide citation)

In picture decoding from compressed data, noise component is predicted for each pixel, and noise-free original picture data is predicted from the predicted noise component and the decoded picture data, thus permitting picture quality improvement to be obtained.


6
Chong U Lee: Adaptive block size image compression method and system. Qualcomm, Russell B Miller, June 4, 1991: US05021891 (153 worldwide citation)

An image compression system and method for compressing image data for transmission. Each block and corresponding sub-blocks of pixel data is subjected to a discrete cosine transform (DCT) operation. Varying levels of sub-blocks of resulting corresponding transform coefficients are selected for const ...


7
Hakan Ancin: Document segmentation system. Seiko Epson Corporation, Michael T Gabrik, September 21, 1999: US05956468 (133 worldwide citation)

A method and apparatus for segmenting a document which has both text and image regions. The method and apparatus implement a technique in which large text pixels and image pixels are identified in a document having a relatively low resolution. The method and apparatus then detect dark text pixels on ...


8
Yoshinori Hatori, Toshio Koga, Kiichi Matsuda, Naoki Mukawa: Image coding system coding digital image signals by forming a histogram of a coefficient signal sequence to estimate an amount of information. Kokusai Denshin Denwa, NEC Corporation, Fujitsu, Nippon Telegraph and Telephone Corporation, Sughrue Mion Zinn Macpeak & Seas, April 24, 1990: US04920426 (115 worldwide citation)

In an image coding system having a plurality of coding characteristics, such as quantization characteristics, information of a digital image signal sequence is monitored in each of a number of predetermined intervals by forming a histogram of a sequence of coefficients which is calculated from the d ...


9
Ming Chieh Lee: Pixel block correlation process. Microsoft Corporation, Klarquist Sparkman Campbell Leigh & Whinston, July 21, 1998: US05784175 (113 worldwide citation)

A method of correlating transformation blocks between video frames for a block matching motion estimation process utilizes redundancy inherent in correlating pixel blocks to significantly reduce the processing resources required to perform the correlation. The method includes defining for the transf ...


10
Hewitt D Crane, John D Peters, Eugenio Martinez Uriegas: Method and apparatus for decoding spatiochromatically multiplexed color images using predetermined coefficients. SRI International, Townsend and Townsend and Crew, May 4, 1999: US05901242 (104 worldwide citation)

Color image decoding is achieved by a simplified method of decoding a spatially and chromatically multiplexing image plane (32), such as a plane consisting of RGB (Red-Green-Blue) pixels (22) by performing a summation of pixels of all three colors in a neighborhood of a missing pixel. The decoding p ...