| 摘要 |
An image processing system processes a composite original image having both of letter and picture information to have the letter information extracted. An image signal in the form of pixel is checked to see if it is a letter pixel, in which case "1" is assigned, or a picture pixel, in which case "0" is assigned, so that a plane data of "1s" and "0s" is obtained and stored in a plane memory. At the same time, the image signal is converted into a binary image data which is stored into an image memory. The data stored in the plane memory is subjected to two-step digital filtering processing, first step to eliminate isolated black and white dots and second step to smooth the data, thereby obtaining filtered data which define one or more letter regions in an original document. Using the thus defined letter region data, the binary image data stored in the image memory is processed, thereby extracting only the letter image data.
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