发明名称 |
Digital image compression and transmission system visually weighted transform coefficients |
摘要 |
A system for compressing and transmitting a digital image signal over a limited bandwidth communication channel, transform codes the image values and quantizes the transform coefficients according to a two-dimensional model of the sensitivity of the human visual system. The model of the human visual system is characterized by being less sensitive to diagonally oriented spatial frequencies than to horizontally or vertically oriented spatial frequencies, thereby achieving increased compression of the image.
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申请公布号 |
US4780761(A) |
申请公布日期 |
1988.10.25 |
申请号 |
US19870057413 |
申请日期 |
1987.06.02 |
申请人 |
EASTMAN KODAK COMPANY |
发明人 |
DALY, SCOTT J.;RABBANI, MAJID;CHEN, CHENG-TIE |
分类号 |
H04N7/26;H04N7/30;(IPC1-7):H04N7/133 |
主分类号 |
H04N7/26 |
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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