Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1987-06-02
1989-07-18
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358136, 358135, H04N 712
Patent
active
048498106
ABSTRACT:
A method and apparatus for encoding interframe error data in an image transmission system, and in particular in a motion compensated image transmission system for transmitting a sequence of image frames from a transmitter to a receiver, employ hierarchial vector quantization and arithmetic coding to increase the data compression of the images being transmitted. The method and apparatus decimate an interframe predicted image data and an uncoded current image data, and apply hierarchial vector quantization encoding to the resulting pyramid data structures. Lossy coding is applied on a level-by-level basis for generating the encoded data representation of the image difference between the predicted image data and the uncoded original image. The method and apparatus are applicable to systems transmitting a sequence of image frames both with and without motion compensation. The method and apparatus feature blurring those blocks of the predicted image data which fail to adequately represent the current image at a pyramid structural level and shifting block boundaries to increase the efficiency of the vector quantization coding mechanism. The method further features techniques when gain/shape vector quantization is employed for decreasing the data which must be sent to the receiver by varying the size of the shape code book as a function of the gain associated with the shape. Thresholding and the deletion of isolated blocks of data also decrease transmission requirements without objectionable loss of image quality.
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Groody James J.
Kostak Victor R.
PictureTel Corporation
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