Image data encoding and decoding apparatus utilizing characteristic points of image data and methods thereof
 An image data encoding apparatus and decoding apparatus which perform encoding and decoding making effective use of the correlation of positional information of characteristic points of the luminance signal element and chrominance signal elements of image data. A first signal analysis unit analyzes the luminance signal Y, from which the low frequency component has been removed, using a filter having several resolution scales s, detects and connects the characteristic points from the results of the analysis, and produces line data. Based on the line data, the values of the results of analysis are extracted. A second signal analysis unit performs similar processing on the chrominance signal U and a third signal analysis unit performs similar processing on the chrominance signal V. First to third analysis result compression units compress the input signal by predictive encoding etc. The first to third signal analysis units produce the low frequency components of the luminance signal Y and the chrominance signals U and V. A low frequency component compression unit compresses the low frequency components. A transformation unit multiplexes and modulates the signal obtained by the above processing and inputs it to the transmission medium etc. connected to the encoding apparatus. 
Sony Corporation
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Masahiro Jin Hiroshi
Fujita Sato Abe