| 摘要 |
The self-testing method uses the histograms of two partial regions (4,5) adjacent an edge (3) of an image object (2) and respectively containing the background (1) and the image object and the grey value profile along a line (6) extending across the image edge, for determining the object brightness, the background brightness and the standard deviation of the grey value profile, for comparison with reference values for verifying the correct illumination and sharpness of the image. |
