Patent ID: 6285800
Filing Date: 2001-09-04
Classification: H04N

Abstract:
An image processing apparatus for converting M gradation image data into N gradation image data, wherein N is less than M, said image processing apparatus comprising:determining means for determining, based on the M gradation image data of a target region, whether the target region corresponds to an edge portion or to a non-edge portion; andprocessing means for generating, based on the determination by said determining means, the N gradation image data of the target region by using a first matrix in a case where the target region corresponds to the edge portion, and for generating the N gradation image data of the target region by using a part of a second matrix in a case where the target region corresponds to the non-edge portion,wherein said first matrix has a first size corresponding to one region of the M gradation image data, and said second matrix has a second size corresponding to a plurality of regions of the M gradation image data.