| 摘要 |
When the range of luminance values expressed by an image is divided into a plurality of levels, a histogram measurement unit generates histogram data indicating the numbers of pixels for respective levels by calculating, for respective levels, the total of the number of pixels in the image, which have luminance values belonging to an identical level. A microcomputer calculates, for respective levels, the difference between the number of pixels belonging to an identical level using the histogram data of a first frame image and that of a second frame image input immediately before the first frame image. The microcomputer determines based on the differences for the respective levels whether or not to update a tone correction table held by a tone correction unit, and then converts the tone characteristic of the first frame image using the tone correction table, and outputs the converted image. |
