| 摘要 |
In a frame image, areas near which high-luminance pixels in red color are concentrated are regarded as pointer candidate areas. Whether a luminance distribution that is characteristic of a standing-still pointer is present radially from the center of each area is checked. If the pointer is not found, the areas are narrowed down. If the pointer is still not found, a moving pointer is detected through an in-between frame differential process and a positional relation between the specified pointer coordinates and a plurality of characters in the frame is calculated. Based on a positional relation of the characters with each corresponding character on the slide, the coordinates on the slide corresponding to the coordinates of the specified pointer are calculated.
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