Image analysis – Image compression or coding
Patent
1996-02-16
1998-04-14
Boudreau, Leo
Image analysis
Image compression or coding
348415, 348416, G06K 936, H04N 712
Patent
active
057402787
ABSTRACT:
A method and system for compressing and decompressing video image data in real time employs thresholding and facsimile-based encoding to eliminate the need for computationally intensive two-dimensional transform-based compression techniques. The method operates first by forming a difference frame which contains only information pertaining to the difference between a current video image frame and a computed approximation of the video image frame. The difference frame is fed to a thresholder which categorizes each pixel in the frame as being either in a first set having intensities above or at a preset threshold, or a second set having intensities below a preset threshold. A facsimile-based compression algorithm is then employed to encode the first set of above or at threshold pixel locations. To compress the intensity data for each above or at threshold pixel, a quantizer and lossless encoder are preferably employed, with the quantizer serving to categorize the intensities by groups, and the lossless encoder using conventional coding, such as Huffman coding, to compress the intensity data further. Various techniques may be employed with the embodiments of the invention to adjust the actual amount of compressed data generated by the method and system to accommodate communication lines with different data rate capabilities.
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"Bayesian Block-Wise Segmentation of Interframe Differences in Video Sequences" Ken Sauer et al, CVGIP: Graphical Models and Image Processing, vol. 55, No. 2, pp. 129-139, Mar. 1993.
CCITT Recommendation T.4, "Standardization of Group 3 Facsimile Apparatus for Document Translmission" pp. 1-12.
Ebrahimi, Tourdj et al., "New Trends in Very Low Bitrate Video Coding", IEEE Proc., vol. 83, No. 6, pp. 877-891, Jun. 1995.
Berger Toby
Chiu Yi-Jen
Boudreau Leo
Chen Wenpeng
Cornell Research Foundation Inc.
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