Patent ID: 9681024
Date: 2017-06-13
CPC Classifications: G06K,H04N

Claim:
1. An image processing apparatus that receives a pixel value of each pixel of an image, the apparatus comprising: a memory; a central processing unit (CPU) connected to the memory and that processes the image by: generating an AM screen noise or FM screen noise; generating a green noise superimposed on a target pixel by using an after-binarization output value of a binarized processed pixel; adjusting an offset component of the AM screen noise or FM screen noise so that the offset component of the AM screen noise or FM screen noise has a predetermined value in minus; adding an error integrated value diffused to the target pixel, the green noise and the AM screen noise or FM screen noise, to the pixel value of the target pixel; binarizing, with a threshold value, the pixel value of the target pixel to which the error integrated value, the green noise and the AM screen noise or FM screen noise are added; calculating an error value due to binarization by calculating a difference between an output value of the target pixel after the binarization and the pixel value of the target pixel to which the error integrated value and the AM screen noise or FM screen noise are added; and outputting the error integrated value diffused to the target pixel, by using the calculated error value with respect to the binarized processed pixel, wherein the CPU outputs the processed image for display or printing.