Patent ID: 6108456
Filing Date: 2000-08-22
Classification: H04N

Abstract:
An image processing system comprising:a reading unit having a line sensor;first moving means for relatively moving said reading unit and an original image in a subscanning direction of said line sensor;second moving means for relatively moving said reading unit and said original image in a main scanning direction of said line sensor;control means for controlling in a manner such that said reading unit reads a first reading range on said original image through the relative movement by said first moving means, the relative movement by said second moving means being performed after reading the first reading range, and subsequently said reading unit reads a second reading range adjacent to said first reading range in the main scanning direction through the relative movement by said first moving means;detecting means for detecting a background density of said original image;determining means for detecting a background density in said first reading range by said detecting means on the basis of read data in said first reading range and for determining a binarization threshold value of said second reading range on the basis of the background density detected by said detecting means and a present binarization threshold value of said first reading range before starting to read said second reading range; andbinarizing control means for binarizing an image signal of said second reading range read by said reading unit using the binarization threshold value which is determined by said determining means before the reading of said second reading range.