Interpicture arithmetic unit

Abstract

PURPOSE:To find an exclusive 'OR' between binary pictures by calculating the absolute value of a difference at every point in two pieces of pictures and outputting the value as output picture. CONSTITUTION:Input pictures 1 and 2 are given to an interpicture arithmetic unit 3. It compares density information expressed in numerics at every point between two pictures 1 and 2 holding density information, and sets the absolute value of the difference to a density value on the point corresponding to an output picture 4. The interpicture arithmetic unit 3 consists of a maximum value detection circuit, a minimum value detection circuit and a difference arithmetic circuit, for example.

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