Image analysis – Image compression or coding – Quantization
Reexamination Certificate
2006-08-15
2006-08-15
Chen, Wenpeng (Department: 2624)
Image analysis
Image compression or coding
Quantization
C382S239000, C382S246000, C358S296000
Reexamination Certificate
active
07092578
ABSTRACT:
Previously-unused slots in a Huffman code table associated with a Joint Photographic Experts Group (JPEG) image file are associated with various quantization matrices (Q matrices) that are used to quantize data blocks of the JPEG image file. Huffman codes associated with the various Q matrices permit the particular Q matrix used to quantize a given data block to be signaled by a decoder as an end-of-block (EOB) code. The EOB codes and the Huffman code table are sent with the JPEG image file. Upon decoding of the image file, a standard JPEG decoder reads each of the EOB codes as a standard JPEG EOB code and does not vary the Q matrix. A modified decoder reads from each of the EOB codes which Q matrix was used to encode each particular data block of the image and uses that Q matrix to dequantize the data block.
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Gibson Jonathan S.
Kakarala Ramakrishna
Agilent Technologie,s Inc.
Chen Wenpeng
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