| 摘要 |
An image processing apparatus which eliminates influence of motion of background and performs stable text-image cutout at a high extraction rate. In the apparatus, a block divider 20 divides image data in frame units into blocks of a predetermined size. A DCT unit 24 performs orthogonal transformation on each divided block, and a harmonic coefficient calculator 25 extracts data for judging whether or not the block is a character area. A still-block detector 26 compares the data with data of a corresponding block after orthogonal transformation in a previous frame, judges whether or not the difference between these data is small or large, and outputs the result of judgment. An attribute judgment unit 23 judges whether or not the block is a character area, based on the data from the harmonic coefficient calculator 25 and the data from the still-block detector 26, and outputs the result of judgment.
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