| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To detect a region having a large variation in image quality due to resolution conversion accurately. <P>SOLUTION: A block dividing section 102 extracts the tiles in the horizontal direction Tw and the vertical direction Th from image data of a plurality of lines stored in a strive buffer 101 and stores them in a tile buffer 103. A two color rate calculating section 104 counts the number of color included in a peripheral pixel group located in the vicinity of a remarked pixel position and becoming 2 during raster scanning of the tile buffer 103 thus calculating two color rate Cr representing such a ratio as the number of color in a remarked tile becomes 2. A continuous pixel rate calculating section 105 calculates the continuous ratio of pixels having the same color as a run rate Rr during scanning of the tile buffer. A difference calculating section 106 calculates the resolution conversion error Dt when the image of one tile stored in the tile buffer 103 is converted to have a one half resolution. A pattern decision section 107 decides whether the remarked tile is suitable for resolution conversion or not based on the Cr, Rr and Dt and outputs the decision results. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
