发明名称 |
Method of compressing digital images |
摘要 |
A method of compressing digital representations of images stores the images in multiple subsampling quality scales in a progressive manner such that a higher quality scale contains only data incremental to the data in an adjacent lower quality scale. The data in each quality scale is transformed, quantized, and entropy encoded. A discrete wavelet cosine transformation combining frequency transformation features of a discrete cosine transformation and spatial transformation features of a wavelet transformation is provided. Sequences of subsampling quality scales are provided for multi-scale representations of images. A novel context selection method is used which treats color components and coefficients of different positions differently. An image compressed in a given quality scale can be transmitted or decompressed progressively allowing progressive downloading or transmission over the Internet.
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申请公布号 |
US6823082(B2) |
申请公布日期 |
2004.11.23 |
申请号 |
US20010860109 |
申请日期 |
2001.05.16 |
申请人 |
BOLY MEDIA COMMUNICATIONS, INC. |
发明人 |
HU XIAOPING |
分类号 |
H04N11/04;G06T9/00;H03M7/30;H04N1/41;(IPC1-7):G06K9/00 |
主分类号 |
H04N11/04 |
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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