| 摘要 |
PURPOSE:To execute exactly a measurement by irradiating successively an illuminating light to an object to be inspected from plural directions, adding successively a video signal of an obtained image pickup output, and detecting a contour of the object to be inspected by a variation point of its signal. CONSTITUTION:A video signal of an image pickup outout obtained from a television camera CAM for executing an image pickup to an object 1 from a prescribed direction is compared with a reference voltage and binary-coded at every picture element by a comparator CP operated in accordance with a control signal. This binary-coded signal is stored successively in a video memory VDM in accordance with the same control signal. When one cycle of a control signal CS is ended, an operating part PRS reads out the contents of the video memory VDM, and a point where an added value is varied exceeding a prescribed set value is extracted with regard to the horizontal direction and the vertical direction of each address. This variation point is set, for instance, as ''1'' of a logical value, a no-variation point is set, for instance, as ''0'' of the same, and they are stored in a memory MEM. Thereafter, the operating part PRS sends them out as an output data DO. |
