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Quantization number of bits conversion device and conversion manner, and quantization number of bits study device and study manner
Quantization number of bits conversion device and conversion manner, and quantization number of bits study device and study manner
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机译:量化位数转换装置和转换方式,以及量化位数研究装置和学习方式
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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.
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