发明名称 |
Quality based image compression |
摘要 |
A system and method for quality-based image 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 a 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. |
申请公布号 |
AU3460701(A) |
申请公布日期 |
2001.08.07 |
申请号 |
AU20010034607 |
申请日期 |
2001.01.26 |
申请人 |
QUALCOMM INCORPORATED |
发明人 |
KADAYAM S. THYAGARAJAN;STEVEN A. MORLEY |
分类号 |
H04N19/176;G06T9/00;H03M7/30;H03M7/40;H04N19/60 |
主分类号 |
H04N19/176 |
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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