| 摘要 |
According to the present invention, a CPU 28 a shifts target pixels in steps S 305, S 310, and S 335, and at the same time references the image data in a frame memory 23 f and checks whether the image is inactive, based on the difference in successive images, and whether the pixels are bright, based on the image data, in steps S 320 and S 325 respectively. When the image is liable to burn-in, a variable DF is incremented and a time interval t 1 is updated every 5 minutes, the time interval t 1 is being set shorter for an image liable to burn-in, i.e. the amount of motion is small and many pixels are bright, and set longer for an image not liable to burn-in, i.e. the amount of motion is large and many pixels are dark, at this time.
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