发明名称 |
Quality based image compression |
摘要 |
A system and method for quality-based compression utilizing adaptively sized blocks and sub-blocks of discrete cosine transform coefficient data and a quality based quantization scale factor is claimed. A block size assignment element in an encoder element selects the block or sub-block of an input block of pixel data to be processed. Blocks with variances larger than a threshold are subdivided, while blocks with variances smaller than threshold are not subdivided. A transform element transforms the pixel values of the selected blocks into the frequency domain. The frequency domain values are quantized either on a block by block basis or a frame by frame basis utilizing a scale factor that correlates with the quality of the image. The data is then serialized and coded in preparation for transmission.
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申请公布号 |
US6600836(B1) |
申请公布日期 |
2003.07.29 |
申请号 |
US20000494192 |
申请日期 |
2000.01.28 |
申请人 |
QUALCOMM, INCORPORATED |
发明人 |
THYAGARAJAN KADAYAM S.;MORLEY STEVEN A. |
分类号 |
G06T9/00;H03M7/30;H03M7/40;H04N7/26;H04N7/30;(IPC1-7):G06K9/36;H04N1/32 |
主分类号 |
G06T9/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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