Image analysis – Image compression or coding – Including details of decompression
Patent
1995-09-27
1997-12-02
Boudreau, Leo
Image analysis
Image compression or coding
Including details of decompression
382236, 382250, 382268, 382261, 348420, G06K 936, G06K 946
Patent
active
056944896
ABSTRACT:
A DCT circuit converts a specific block scanning signal into DCT coefficients. An encoder quantizes and Huffman-codes the image signal converted into DCT coefficients to compress it. A code memory stores the compressed image data obtained by quantizing and Huffman-coding a specific block scanning signal at the encoder. An IDCT circuit Huffman-decodes and inverse-quantizes the data read from the code memory and converts it into image data. An in-block horizontal scanning/in-block vertical scanning conversion circuit converts the image data into an in-block vertical scanning signal. An adaptive convolution filter effects the horizontal filtering of the in-block vertical scanning signal to remove the distortion of block boundary. An in-block vertical scanning/in-block horizontal scanning conversion circuit converts the image signal from which distortion has been removed into horizontal scanning direction. An adder circuit reconstructs and outputs the original image.
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Boudreau Leo
Olympus Optical Co,. Ltd.
Tran Phuoc
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