Method of determining the density distribution of an original and of copying the same.

摘要

A method of discriminating an image which comprises; scanning an original image by a photoelectric conversion device,
quantizing of an image signal obtained through the pho- toeiectric conversion device,preparing a density histogram corresponding to said quantized image signal,detecting a peak density value carrespondnng to the peak present on the low-density side of said density histogram, and a density width of said density histogram, and discriminating said original image according to both said peak density value and said density width.