1. An image processor comprising: pattern image making means for making a pattern image formed from pixel data obtained by capturing a pattern of an object; judgment means for counting, with respect to pixels included in the pattern image and in a plural directions from a selected pixel among the pixels, a number of same kind of pixels which consecutively continues from the selected pixel, and for determining in the plural directions whether the number is larger than a reference value; recognition area making means for producing a processing recognition area effective signal that shows a range in which an area to be processed exists with respect to said object; processing candidate authorization means for determining whether said selected pixel is a processing candidate pixel based on a determination of said judgment means; and processing image making means for making processing image by comparing said processing candidate pixel and said processing recognition area effective signal.