发明名称 |
Apparatus and method for compressing and expanding multibit digital pixel data. |
摘要 |
<p>Method and apparatus for converting multibit pixel data to a lesser number of bit pixel data and re-expanding the compressed data. Luminance data for each pixel is established as the 5 most significant bits of the original luminance signal. The chrominance information for groups of pixels is subsampled, and a common chrominance value assigned to each of the pixels in a group. The resulting compressed pixels may be 8 bits wide providing economical possibilities to store the 8 bit wide data. The data is expanded for display by adding lower order data bits to the compressed luminance signal data bits. A subsampled chrominance data signal is appended to the expanded luminance data for display. <IMAGE></p> |
申请公布号 |
EP0445388(A2) |
申请公布日期 |
1991.09.11 |
申请号 |
EP19900123518 |
申请日期 |
1990.12.07 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
LUCAS, BRUCE DAVID;RACKLEY, DARWIN PRESTON;SAENZ, JESUS ANDRES |
分类号 |
H03M7/30;G09G5/00;G09G5/02;G09G5/377;H04N9/64;H04N9/804;H04N11/04 |
主分类号 |
H03M7/30 |
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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