Patent ID: 6151419
Filing Date: 2000-11-21
Classification: H04N

Abstract:
An image reading method in which an original is irradiated by a light source and light from the original is converted into an electric signal, said image reading method comprising:a) a step for detecting and setting sub-scanning white reference data when white reference data used in a shading correction is set;b) a step for detecting sub-scanning white reference data in each of reading lines;c) a step for setting as a white reference correction coefficient a value indicative of a specific relative relationship between the sub-scanning white reference data when said white reference data is set and the sub-scanning white reference data in the respective reading lines; andd) a step for reading the original while executing a shading correction with employment of white reference data corrected by said white reference correction coefficient;wherein when a plurality of originals are read, said steps b), c), and d) are repeatedly performed.