Image coding and decoding apparatus with coded data size information provided coded data blocks
AssigneeFuji Xerox Co., Ltd.
InventorsToshiaki Yoshinari, Kazuhiro Suzuki, Taro Yokose, Ken Umezawa
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Abstract
An image coding and decoding apparatus to improve processing speed in searching for marker information such as control information when decoding, reduce the capacity of memory means for expanding compressed data and reduce the size of the unit of coding and decoding processing is disclosed, wherein divided coded data blocks CodeBlock 1-1, 1-2 and so forth are produced by dividing coded data obtained by coding image data for an image of a predetermined size into a predetermined size and control information values CodeSize1-1, 1-2 and so forth showing coded data block size are appended to each divided coded data block as control information.
Claims4
An image coding and decoding apparatus comprising:
- image data memory means for storing image data temporarily;
- coding and decoding means for carrying out a coding process to obtain coded data by coding the image data and a decoding process to obtain image data by decoding the coded data;
- coded data memory means for storing the coded data and control information necessary for transferring and controlling the coded data when decoding temporarily;
- external device connection means for connecting said image coding and decoding apparatus with external devices which actually carry out transferring and storing of data;
- a coded data size counter for counting the size of the coded data produced by said coding and decoding means;
- and control means for transferring data among said coding and decoding means, said image data memory means, said coded data memory means and said external device connection means, producing and parsing said control information for the coded data, adding said control information to the coded data, extracting said control information from the coded data and sending parameters necessary for the behavior of said coding and decoding means, and wherein said control means comprises coded data dividing means for dividing the coded data produced by said coding and decoding means into a predetermined size to produce divided coded data blocks and coded data size information addition means for appending to each of the divided coded data blocks, when coding the image data, control information showing the data size of the divided coded data blocks as said control information.
Dependencies are inferred from the claim text.