グループ分割DPCMによるディジタル画像圧縮記録装置

概要

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An image encoder/decoder system for digital still cameras was manufactured for experiment. The system consists of an AD/DA converter, a data compressor/expander, and banks of image memories. The picture is devided into square local areas and the brightness of each pixel is converted to 8bit data. These image data are compressed to 4bit data by applying PCM, whose encoding characteristics varies adaptive to the dynamic range of the signal for each local area. According to the magnitude of the dynamic range 8bit data of each local area, which are stored in the temporal memory, are fed into one of eight compressores and converted into 4 bit data. 4 bit data and indices corresponding to the dynamic range are transferred to the main memory and stored there in. The quality of the reproduced pictures was found to be excellent and there were no visible degredations observed.
山梨大学の論文