METHOD FOR CONVERTING A MULTIPLE-DENSITY IMAGE INTO A BINARY DENSITY IMAGE

摘要

An image processing system for finding a local minimum in a histogram of an image in order to define a threshold comprising steps of; Generating a table of density according to the order of number of pixels; Assuming that the density of maximal number of pixels of the table is one local maximum of higher or lower density; Searching another local maximum and the local minimum based on the assumption; Assuming that the density of maximal number of pixels of the table is another local maximum of lower or higher density; Searching another local maximum and the local minimum based on the second assumption; and Determining true local maximums and the local minimum reviewing the first and second searching.