| 摘要 |
PROBLEM TO BE SOLVED: To provide a data processor, a picture display device and an image pickup device which can suppress deterioration of the picture quality of a projected picture without necessitating much labor and time. SOLUTION: The data processor 200 inputs successively pictures of test patterns having the discontinuous gradation which are projected and displayed on a screen 53 by the picture display device 51, via the image pickup device 52. The data processor 200 samples only the picture data of parts of points e, f, g, and h in the screen 53 and, as a result of the sampling, gradation correction values corresponding to the full gradation in the points e, f, g and h are calculated by arithmetic interpolation. Subsequently, the data processor 200 calculates the gradation correction value of parts other than the points e, f, g and h by the arithmetic interpolation based on the gradation correction value of the points e, f, g, and h.
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