SHADING CORRECTING SYSTEM

摘要

PURPOSE:To simplify a shading correction by reading image data out of the white and black areas of a correction card to store it in a memory as correction data and reading said correction data out of a memory in a transaction mode and in response to a reading action of an emboss part to apply the prescribed shading correction to the correction data. CONSTITUTION:A correction card 1 is put into an automatic transaction device and identification data 60 is read out. Thus the automatic transaction device is set in a correction mode. Then the image data on the line directions are read in a white area 61 and a black area 62 of the card 1 and stored in a memory 15 as the correction data 55. In a transaction mode the data 55 is read out in response to a line reading action of an emboss part 2b. Then a white level is corrected and at the same time a dynamic range is increased so as to be controlled by a black level. The corrected emboss read data is binarized in a prescribed level and printed by a print head. Thus the easy and accurate shading correction is realized.