Patent ID: 7023479
Filing Date: 2006-04-04
Classification: H04N

Abstract:
1. An image input apparatus comprising: image pickup means for converting an optical image from an object into electrical image information and accumulating the electrical image information; shielding means for shielding said image pickup means from incidence of the optical image; and processing means for processing the image information from said image pickup means, wherein said processing means comprises: first image information acquiring means for acquiring first image information by closing said shielding means before image pickup, second image information acquiring means for repetitively acquiring, a first predetermined number of times with said shielding means open, second image information accumulated in said image pickup means within a predetermined period, first subtraction processing means for executing a subtraction process between each second image information acquired from said second image information acquiring means and the first image information acquired from said first image information acquiring means, first addition means for adding the subtraction results from said first subtraction processing means, third image information acquiring means for repetitively acquiring, a second predetermined number of times with said shielding means closed after image pickup, third image information accumulated in said image pickup means within a predetermined period, second subtraction processing means for performing a subtraction process between each third image information acquired from said third image information acquiring means and the first image information acquired from said first image infonnation acquiring means, second addition means for adding the subtraction results from said second subtraction processing means, and adding-up means for adding up said first and second addition means.