| 摘要 |
An image processing apparatus performs filtering on block image data that is a predetermined region of original image data using a filter having a main scanning width of N and a sub-scanning width of M. Using a register that can shift image data in a plurality of directions, the image processing apparatus processes pixel data columns in a sub-scanning direction included in the block image data in the following manner. The pixel data columns are processed in the sub-scanning direction and a direction opposite to the sub-scanning direction alternately for each of the pixel data columns, and the pixel data columns are also processed in the order in which the columns are aligned in a main scanning direction. This makes shorter the filtering processing time of the image processing apparatus that performs processing on a block-by-block basis.
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