发明名称 |
Image encoding apparatus employing analog processing system |
摘要 |
An image sensing element for providing a series of voltage signals corresponding to a two-dimensional image, a two-dimensional analog DCT (discrete cosine transform) circuit for performing a two-dimensional DCT on the voltage signal series from the image sensing element in pixel blocks, and a quantization circuit for quantizing a result of the DCT are provided. The two-dimensional analog DCT circuit is formed of a row of analog sum-of-products arithmetic units for one-dimensional DCT and an analog memory array for matrix transposition. The quantization circuit converts a voltage representing a result of the DCT carried out by the two-dimensional analog DCT circuit into a digital value according to a given quantization coefficient Q=2NxS(1</=S<2) wherein a voltage SxVref that is S times greater than a fixed voltage Vref serves as a reference voltage, and performs a process of right-shifting the digital value N bits in order to provide a quantized digital value.
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申请公布号 |
US6141455(A) |
申请公布日期 |
2000.10.31 |
申请号 |
US19970942917 |
申请日期 |
1997.10.02 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
MATSUZAWA, AKIRA;KAWAHITO, SHOJI;TADOKORO, YOSHIAKI |
分类号 |
G06T9/00;H03M7/30;H04N1/41;H04N7/12;H04N7/26;H04N7/30;(IPC1-7):G06T9/00 |
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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