| 摘要 |
PURPOSE:To ensure thresponse to the state change of a small part in a large area by detecting the position of a specific part in a comparatively large two-dimensional area to specify a comparatively small area centering on said specific part and defining said small area as a window to replace this window every time a specific part is detected. CONSTITUTION:An object or a person is photographed by means of an image pickup means which converts the optical information on an image into electrical signals and a position detecting means that detects the position of a specific part of the image based on said electrical signals. Then a specific part of the photographed picture, e.g., the eyes, the mouth, etc. of a driver is detected. As the brightness varied within a car, an image illuminating means is added together with a brightness setting means for brightness of illumination and a brightness indicating means which detects the image brightness and gives an indication to said brightness setting means to change the image brightness. In such a constitution, the brightness is kept at a fixed level for the photographed picture, i.e., a driver's face. Thus it is possible to prevent a picture processing error caused by the variation of brightness.
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