Patent ID: 6088479
Filing Date: 2000-07-11
Classification: H04N

Abstract:
An image processing method for processing image data which is obtained by reading a document having primary colors in which a character and figure drawing is drawn on a background drawing by a scanner, comprising at least the following steps of:a) creating first background image data from a first portion of the background drawing of the document;b) creating second background image data from a second portion of the background drawing of the document;c) creating a first histogram of the brightness level of each primary color constituting said first background image data and accumulated occurrence frequency;d) creating a second histogram of the brightness level of each primary color constituting said second background image data and accumulated occurrence frequency;e) creating a histogram matching filter for bringing said second background image data close to said first histogram and said second histogram; andf) bringing said second portion of said background drawing close to said first portion by processing said background image data by said histogram matching filter.