Background determination method of the image data, the image data background determining apparatus and the image data of the background determination program medium for recording the

摘要

PROBLEM TO BE SOLVED: To make a picture to be clearly by obtaining picture data expressed by multi-gradations with the picture element of a dot matrix form, adding gradations, generating degree distribution, calculating the statistical quantity of the characteristic display of an area divided by prescribed gradation and deciding that an area constituting a ground exists when statistical quantity shows a value sufficient for constituting the ground. SOLUTION: A color scanner 20 starts scanning and generates picture data formed of the picture element of low resolution on the picture of a whole flat bed containing the picture of a document. Thus, pre-scanning is executed. It is decided whether or not an area constituting the ground exists in picture data of the document picture, based on a prescribed method from generated picture data. The color scanner 20 operates the flat bed and starts the real scanning of high resolution. A correction processing is executed on picture data which is read by real scanning by a correction curve, based on a prescribed statistical value.