METHOD FOR DETECTING FOREIGN MATERIALS OF IMAGE SENSOR IN SCANNING DEVICE, AND DEVICE FOR THE SAME

摘要

PURPOSE: A method for detecting foreign materials of an image sensor in scanning device, and a device for the same are provided to enhance productivity and aid performance improvement of a product through reduction of a bad ratio for a scanning device set by finding bad of the image sensor with use of a result scanning a foreign material detection chart and thresholds. CONSTITUTION: A shading part(80) performs white and black shading of the scanning device. A scanning part(84) scans the foreign material detection chart(82) including a predetermined pattern having a white level and the '1-N'th black levels. For each back level of the scanned chart, a comparator(86) respectively compares the '1-N'the brightness deviations inputted from the scanning part with the '1-N'th thresholds and outputs the compared results.