Image conversion method and circuit for image conversion

Abstract

The present invention relates to an image conversion method for converting an original image into a final image, the conversion method comprising: providing an ordered halftone mask, the ordered halftone mask comprising a first number of original ordinal values, from the original ordinal values Determine the first number of adjustment ordinal values ​​with the adjustment parameters; determine the gray scale conversion parameters by the original gray scale number and the final gray scale number, divide the gray scale value of each pixel in the original image by the gray scale conversion parameter to obtain the quotient corresponding to each pixel number and remainder; the original ordinal value is divided into the second number of groups, the remainder of each pixel is compared with the corresponding adjusted ordinal value, and the comparison parameter is determined according to the comparison result. If the remainder is greater than the adjusted ordinal value, the corresponding The quotient and the group determine the comparison parameter; the final image is determined by the pixel-by-pixel quotient and the corresponding comparison parameter. The invention groups each original ordinal value of the ordered halftone mask, and improves the phenomenon of color bands and blocks during image conversion.

Description

technical field [0001] The invention relates to an image conversion method and a circuit for image conversion, in particular to an image conversion method for improving the phenomenon of color bands or color blocks during image conversion. Background technique [0002] Halftone conversion is a method that uses the human eye's visual illusion to increase the degree of grayscale variation. Such technology has been widely used in the field of image processing, including printing, printing and some display technologies. Due to the grayscale variation contained in the original image, it is often higher than the color variation that printing equipment can provide. Through halftone conversion, the printing result can be visually restored or simulated the real gray scale change effect. For example, a printer might contain only black ink, but undergo halftone conversion to simulate grayscale. [0003] figure 1 is a schematic diagram of the prior art image conversion circuit. Ple...

AI Technical Summary

Problems solved by technology

as Figure 2C As noted in , the traditional binary processing method that simply converts the input multi-bit image into a binary image reduces the quality of the print, causing color bands or patterns to appear on the final printed image, resulting in distorted images for the human eye. comfortable result

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