The system in order to compare the image which possesses the contrast level which differs and

摘要

Methodology and the system which compare the picture which possesses the contrast of the level which differs are offered. Contrast is formalized between the pictures which possess the contrast level which differs, brightness is set. The occasion where contrast is formalized, derivative of gray level is required 1st 1st has contrast level concerning the digital image, derivative of gray level is required concerning the 2nd digital image which possesses the 2nd contrast level whose 1st is larger than contrast level. Derivative of gray level derivative of gray level concerning the 1st digital image and concerning the 2nd digital image ratio is required, derivative of gray level concerning the 1st digital image is equalized derivative of gray level concerning the 2nd digital image. At least brightness of the picture of one side being automatic by among other things calculating average pixel value excluding the background and the text, or may be set by hand.