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CODING METHOD, CODER, DECODING METHOD, DECODER, DIGITAL CAMERA, DATABASE MANAGEMENT SYSTEM, COMPUTER AND STORAGE MEDIUM
CODING METHOD, CODER, DECODING METHOD, DECODER, DIGITAL CAMERA, DATABASE MANAGEMENT SYSTEM, COMPUTER AND STORAGE MEDIUM
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机译：编码方法，编码器，编码方法，解码器，数码相机，数据库管理系统，计算机和存储介质
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摘要
PROBLEM TO BE SOLVED: To improve the compression efficiency by adopting vector quantization of the multi-stage system such that vector quantization is applied to a sub-band of a medium frequency component in response to a content of a sub-band of a low frequency component and vector quantization is applied to a high frequency component depending on the contents of a sub-band of the medium frequency component. SOLUTION: A signal source 1 is given a digital image signal SI to a sub- band separate circuit 2. The separate circuit 2 separates an image IM into sub-bands according to three resolution degree levels. A coding circuit 3 executes DPCM coding and a sub-band coded by the coding circuit 3 is fed to a multiplexer 6 and a decoding circuit 4. The decoding circuit 4 decodes the coded sub-band and fed to a vector quantization circuit 5. The quantization circuit 5 encodes the sub-band with a higher frequency component received from the separate circuit 2. A multiplexer 6 receives the coded sub-band at a lower resolution on one hand and receives the coded sub-band on the other hand to shape the data.
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