| 摘要 |
The digital still camera of the present invention includes: a microcomputer for controlling the camera and for performing the compression coding and the expansion decoding on images; an image photographing unit for converting images into electric signals using a CCD; a memory for temporarily storing information of photographed images to perform the compression coding and the expansion decoding on the images, the memory including a RAM used for the operation of the microcomputer and a ROM for storing a control program for controlling the microcomputer; a memory card for storing data of compressed images obtained after the photographed images are subjected to the compression coding; and a liquid crystal display unit for displaying the photographed images. The microcomputer fetches a variable length code of one word from a buffer accumulating codes to be decoded so that the decode start bit is shifted to the most significant bit, obtains a run length of the fetched variable length code, searches the primary decoding table using the obtained run length to obtain a corresponding offset and evaluation bit pattern, adds a constant "1" to the run length, shifts the variable length code to the left by the addition result, shifts the variable length code to the right by the evaluation bit pattern length to obtain an evaluation bit pattern. The microcomputer searches the secondary decoding table to obtain a decode value and a code length using an addition value obtained by adding the evaluation bit pattern to the offset.
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