| 摘要 |
<P>PROBLEM TO BE SOLVED: To perform high-speed gradation conversion of an image having pixels whose values have a plurality of components. Ž<P>SOLUTION: In the image processor, a quantization value OUT of an additional value obtained by adding a pixel value IN of the image and a filter output U that is a result of filtering of a quantization error Q is obtained as the sum of an integer part I of the pixel value IN and an integer part J of a decimal additional value X that is the sum of the filter output U and a decimal part P of the pixel value IN on the basis of a decimal point of the quantization value OUT, and the quantization error Q of the quantization value OUT is obtained as a decimal part of the decimal additional value X that is the sum of the filter output U and the decimal part P of the pixel value IN on the basis of the decimal point of the quantization value OUT. Based thereon, in an error diffusion part 51, each of the pixel value IN and the decimal additional value X is separated into the integer part and the decimal part, and the quantization value OUT and the quantization error Q are obtained to perform the gradation conversion using an error diffusion method. The image processor can be applied to a device for gradation conversion. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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