Transcoding scheme for assistance in image transformations
AssigneeTexas Instruments Incorporated
InventorsVenkat V. Easwar, Vivek Kumar Thakur
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Abstract
This invention proposes to transcode the compressed image, that may be in the JPEG format for example, to an intermediate format that allows pseudo-random access. Such a pseudo-random access would that allow efficient image transformation. By using this format, in most cases a pixel is decoded only once in the entire image transformation process. This is certainly true for the most common transformation operations such as rotation by 90, 180 and 270 degrees. This transcoding would enable image transformations in printers whose memory is insufficient to store the entire decompressed image.
Claims6
A method of transcoding image data in a compressed format comprising the steps of:
- decoding differential pulse code modulation DC frequency components of plural image blocks;
- partitioning the image into a plurality of image cells, each image cell including a plurality of image blocks;
- recoding DC frequency components of plural image blocks in differential pulse code modulated format, said differential pulse code modulated of said image blocks contained solely within a corresponding image cell;
- extracting the Huffman tables from the image data;
- storing said extracted Huffman tables together with an indication of an associated image cell in a header for said image cell;
- identifying image blocks by a block count;
- and
- recoding said identified image blocks into corresponding image cells.
Dependencies are inferred from the claim text.