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Abstract

An image processing system comprises a television-type camera for line-by-line scanning an article to generate a video signal representing an image of the article. The video signal is applied to one end of an even number 2n of series-connected delay elements whose time delays are symmetrical relative to the mid-point of the series, and the amplitudes of the underlayed and successively delayed video signal are normalized so that all such amplitudes are equal when the video signal over the total delay period represents a constant intensity portion of the image. A signal D is formed representing the difference between n times the amplitude of the video signal at the mid-point of the series of delay elements and the sum of the amplitudes of the video signal at the input of the series of delay elements and at the output of each delay element except the delay element whose output is at the mid-point of the series. The signal D defines the positions, in the direction of line scanning, of edges between contrasting regions of the image.

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