| 摘要 |
According to a degree of brightness degradation of image display means, a gradation conversion table to be used is easily selected. A gradation conversion table storing unit for storing 3 gradation conversion tables having different input/output characteristics, table selection means for selecting one of the 3 gradation conversion tables, a gradation correction unit for carrying out gradation conversion processing on an image signal according to the selected table, image display means for displaying a visible image represented by an image signal after the gradation conversion processing, and a contrast pattern storing unit for storing contrast patterns at a plurality of levels changing gradation recognition performance in accordance with a plurality of levels of the brightness degradation of the image display means are included.
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