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ALREADY COMPRESSED DYNAMIC IMAGE DATA AMOUNT REDUCTION DEVICE, ALREADY COMPRESSED DYNAMIC IMAGE DATA AMOUNT REDUCTION SYSTEM AND ALREADY COMPRESSED DYNAMIC IMAGE DATA REDUCTION METHOD
ALREADY COMPRESSED DYNAMIC IMAGE DATA AMOUNT REDUCTION DEVICE, ALREADY COMPRESSED DYNAMIC IMAGE DATA AMOUNT REDUCTION SYSTEM AND ALREADY COMPRESSED DYNAMIC IMAGE DATA REDUCTION METHOD
PROBLEM TO BE SOLVED: To reduce further dynamic image data amount already compressed with a simple system configuration by reducing a data amount of an in-frame prediction coding frame and revising control information so as to be in matching with dynamic image data after the reduction. SOLUTION: A CPU 101 receives dynamic image data sent via a high speed communication network 111 via a communication control section 103 and gives the data to an image processing section 104, from which dynamic image data after data amount reduction processing are extracted and sent to a low speed communication network 112. The image processing section 104 applies arithmetic processing to a spatial frequency component obtained from the MPEG form dynamic image data with DCT processing and obtains the reduced spatial frequency component designated by a requested picture element number to compress the data amount. Furthermore, the inter-frame prediction coding frame in the forward direction or in two ways is replaced with dummy data to reduce a frame rate substantially. Moreover, control information representing a characteristic of the dynamic image data is revised so as to be in matching with the data amount after the reduction processing.
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