Image compression apparatus

Details Image compression apparatus Image compression apparatus

2005-02-15

2009-12-01

Alavi, Amir (Department: 2624)

Image analysis

Image compression or coding

C382S240000, C382S250000, C382S251000

Reexamination Certificate

active

07627180

ABSTRACT:
To improve the data compression ratio in the data compression/decompression method utilizing the down-sampling process. Image data in a DS area division unit (130) is divided into a plenty of DS areas and DS areas which are not important are converted into contracted data of the block size by down-sampling in a down-sampling unit (131). A relocation unit (132) allocates two or more contracted data in one DS area, inserts file data into the other portion in the DS area, and removes the DS area where no contracted data is allocated, thereby reducing the entire image size. The image data thus contracted is inputted into a JPEG encoder (14) and subjected to a DCT process and a quantization process for each block. When performing restoration, decompression is performed by the JPEG decoder and the original location is restored. As for the contracted data, interpolation is performed to restore the image data.

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K Shimauchi et al , “JPEG Based Image Compression Using Adaptive Resolution Conversion,” 2003 International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS 2003), Awaji Island, Japan, Dec. 7-10, 2003, pp. 379-384.
Kazuhiro Shimauchi et al , “JPEG Based Image Compression Using Adaptive Resolution Converstion,” D5-4, 18th Digital Signal Processing Symposium 2003, Nov. 2003.

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