| 摘要 |
PCT No. PCT/JP93/00285 Sec. 371 Date Nov. 5, 1993 Sec. 102(e) Date Nov. 5, 1993 PCT Filed Mar. 8, 1993 PCT Pub. No. WO93/18471 PCT Pub. Date Sep. 16, 1993Input image data representing the image of a subject imaged by a video camera is applied from an A/D converter circuit 11 to a dither-image generating circuit 13, in which the image data is binarized in accordance with the error diffusion method, whereby dither image data represented by one bit per pixel is obtained. A plurality of small areas each comprising a plurality of pixels are set within a window caused to scan the dither image, and the dither image data is summed in each and every small area by an image restoration circuit 14, whereby gray-level image data, in which each small area serves as one pixel, is restored. A difference or correlation value between the restored image data and text data set in advance with regard to a standard image is calculated, for the window at each and every position, by an arithmetic circuit 15. The smallest difference or the largest correlation value and the position of the window in which this smallest difference or the largest correlation value is produced are sensed by a peak holding circuit 16.
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