RAW DATA COMPRESSING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a RAW data compressing method capable of not only compressing RAW data obtained by a single CCD solid imaging element having a CFA at a high rate and with a low distortion but also attaining a preview function to confirm the compressed RAW data conveniently as an image by a JPEG decoder.

SOLUTION: The RAW data observed by the single CCD solid imaging element having the CFA is directly compressed as "JPEG data capable of decoding the RAW data". The decoding process and the down sampling of the JPEG decoder are formulated. The JPEG data, which corresponds to such a quantization DCT coefficient as to reduce the error between the decoded RAW data and the observed RAW data is generated as the "JPEG data capable of decoding the RAW data". Computations to determine the quantized DCT coefficient are repeated to reduce the parameter number of the DCT coefficient. The quantization table of the DCT coefficient is redesigned to generate the "JPEG data capable of decoding the RAW data".

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