| 摘要 |
PURPOSE:To perform the binarization processing in accordance with the type of an image, by converting multivalue image data to binary data on the basis of the compared outputs of the first and second comparing means and detecting the continuity of the binary data in line and row directions. CONSTITUTION:A character processing circuit 4 compares a specific threshold value with image data 6 to sharply output the image of a character or line drawing. A medium constrast processing circuit 5 successively compares the threshold value shown by a dither matrix with the image data 6 according to a dither method to reproduce the medium contrast image of a photograph or the like with good gradation. In a character region judge circuit 8, the multivalue image data 6 are converted to binarized data 24 by a binarization circuit 21 and the binary data 24 corresponding to three lines are stored in a line buffer 22. A judge device 23 sets a judge signal 9 to '1' and sets the same to '0' at the time of a medium contrast region. A switch 10 is changed over by the judge signal 9 and the output of the processing circuit 4 or 5 is outputted to a printing part 11. |
