| 摘要 |
A signal is generated for producing a video display of superimposed images, one of which is derived from a system for detection of non-visual signals, such as an ultrasonic inspection system 12, 13 whilst the other is a television image produced by video camera 16. Accurate registration of the superimposed images is achieved by providing a movable probe 13 of the ultrasonic inspection system indicating the location of inspection with a point source 15 of light or other radiation to which the video camera responds. During each raster scan of the video camera the position of the point source is registered and data, representing the response of the detector system, stored in a memory system. An output from the memory system is combined 22 with the camera video signal to produce the superimposed images. When the probe indicates that test piece 11 is O.K, only switch 24 is closed giving a green image, but at points where the test piece is defective only switch 23 is closed giving a red image (as opposed to a black and white image for untested area). <IMAGE>
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