| 摘要 |
PURPOSE:To accurately detect a pitch between image blocks in a row or column direction by finding out self-correlation of an image in the row or column direction. CONSTITUTION:An original image is inputted by an image input device 101 as a luster image, and stored in an image memory 102. The lower end of a row and lower end coordinates indicated by a row pointer 116 are referred by a row position table 104, the image is transferred from the memory 102 to a projection circuit 105 to find out the projection of the row image to the (x) axis, and the obtained result is stored in a projection buffer 106. The same value as the buffer 106 is set up in a projection shift buffer 108. The bit-AND operation between data of both the buffers 106, 108 is operated and the result is stored in a correlation buffer 109. Since the self-correlation can be obtained by operating AND between the both the buffers 106, 108 and a character pitch can be found out in each row from the self-correlation, the pitch between image blocks in the row or column direction can be accurately detected.
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