| 摘要 |
In this invention, an effective pixel count (N) in a horizontal direction of original image data is calculated, and whether this calculated effective pixel count (N) is a natural number multiple of the number (B) of banks is checked. If it is determined that the effective pixel count (N) is a natural number multiple of the number (B) of banks, original image data to which invalid image data is added in the horizontal direction is written in a memory. Since this prevents continuous access from the same bank during memory read, high-speed data access is possible even when original image data is rotated.
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