US 11,750,760 B2
Image forming device, image processing method, and non-transitory recording medium storing program with determining image processing method based on image
Chiharu Hirayama, Osaka (JP); and Daisaku Imaizumi, Osaka (JP)
Assigned to SHARP KABUSHIKI KAISHA, Sakai (JP)
Filed by SHARP KABUSHIKI KAISHA, Sakai (JP)
Filed on Dec. 30, 2020, as Appl. No. 17/138,274.
Claims priority of application No. 2020-001094 (JP), filed on Jan. 7, 2020.
Prior Publication US 2021/0211556 A1, Jul. 8, 2021
Int. Cl. H04N 1/40 (2006.01); H04N 1/405 (2006.01); H04N 1/60 (2006.01); H04N 1/00 (2006.01)
CPC H04N 1/4052 (2013.01) [H04N 1/00427 (2013.01); H04N 1/40012 (2013.01); H04N 1/6027 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An image processing method, comprising:
generating a first evaluation image subjected to grayscale processing as a first image processing with respect to an input image data, and a second evaluation image subjected to image processing to generate an image having a smaller number of gradations than the first evaluation image as a second image processing with respect to the input image data;
calculating statistical amounts, in block units, for each pixel in a block of the input image data based on a gradation difference value between gradation values of the first evaluation image and the second evaluation image;
generating an output image data from the input image data by performing the second image processing with respect to the input image data if the number of blocks having the statistical amounts greater than or equal to a set value is less than a threshold; and
outputting the output image data by printing on paper or transmitting outside an image processing device that performs the image processing method,
wherein
the second evaluation image includes a processed image having a file size between a grayscale processed image and a simple binarization processed image.