| 摘要 |
PURPOSE:To detect unauthorized picture data and to obtain an image with high reliability, by discriminating the acquirement of normal picture data based on two picture data obtained by the image pickup of the same area by changing a time, and performing an image processing such as feature extraction, etc., only when the picture data is decided as normal. CONSTITUTION:A picture memory is constituted of image memories IMA and IMB consisting of (nXm) bits which store picture element data of one picture. First of all, the initialization of a constant such as the above stated (n) and (m) and a preset value Th is performed. Next, an image-picked up picture data is converted to digital picture data, and is transferred to the image memory IMA. Next, the picture data image-picked up after a time DELTAT is transferred to the image memory IMB. Next, the satisfaction of a condition 0<S<Th by the dispersive value S of the lightness difference of the picture element data is decided. At this time, the Th is the maximum value of the dispersive value S possible to recognize a picture plane as normal. And when the picture data is normal, the calculation of a feature quantity is performed based on the picture data stored in the memory IMA or IMB, and the recognition of an object can be performed.
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