Image analysis – Image compression or coding – Including details of decompression
Reexamination Certificate
2004-11-04
2008-12-23
Alavi, Amir (Department: 2624)
Image analysis
Image compression or coding
Including details of decompression
C345S560000
Reexamination Certificate
active
07469067
ABSTRACT:
Progressive scan encoded JPEGS are decoded sequentially on a Minimum Coded Unit (MCU) basis and then the JPEG image is output one row at a time to a frame buffer. Since the entire image does not need to be decoded at once, a huge JPEG buffer is generally not required. The present invention reconstructs each MCU one scan at a time to produce complete lines of image data and thus provides an output using the image data on a line-by-line basis. This technique may require that each MCU be reconstructed scan-by-scan. This technique provides a modified entropy (Huffman) decoder in which data for different scans of an MCU of the progressively scanned JPEG image may be stored in a buffer, and a parsing and scan table element creates pointers to the memory buffer corresponding to the start of each scan level. Scan tables are also extracted for each level of scan or points to the same tables if some scan levels use the same table.
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International Telecommunication union, CCITT, “Terminal Equipment and Protocols for Telematic Services, Information Technology—Digital Compression and Coding of Continuous-Tone Still IMages—Requirement and Guidelines”, Recommendation T.81 (Sep. 1992).
Alavi Amir
Bell Robert Platt
Imam Maryam
Magnum Semiconductor, Inc.
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