发明名称 |
CONVERTING DEVICE FOR THE NUMBER OF QUANTIZING BITS |
摘要 |
PURPOSE:To increase information at the time of transforming input image data into image data having more quantization bits. CONSTITUTION:A blocking circuit 32 divides input image data (8 bits) inputted from an input terminal 31 into plural blocks. A detection circuit 33 detects the maximum and minimum values of picture element levels in each block and a subtractor 37 finds out a level change in the block. The level change is supplied to a comparator circuit 38 and compared with a threshold Th inputted from a terminal 39. A class code generating circuit 36 generates a class code (c) from the 8-bit data, a bit pattern corresponding to the code (c) is read out from a data memory 9 and added to the lowest bit of the 8 bits through a lower bit adding circuit 35. A selector 40 outputs one of outputs (10-bit data) from a '00' adding circuit 34 and the circuit 35 in response to the compared result of the circuit 38. |
申请公布号 |
JPH0785267(A) |
申请公布日期 |
1995.03.31 |
申请号 |
JP19930186986 |
申请日期 |
1993.06.30 |
申请人 |
SONY CORP |
发明人 |
KONDO TETSUJIRO;KAWAGUCHI KUNIO |
分类号 |
H03M7/38;G06T5/00;G06T7/00;H04N1/40;H04N5/92 |
主分类号 |
H03M7/38 |
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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