Television motion detection arrangement

Claim 1

A television motion detection arrangement having at least one television picture store for storing digital picture signal values related to picture elements of an interlaced television picture which on display is formed line-sequentially or horizontally and field-­sequentially or vertically, a frame period comprising several field periods, and further including a picture signal value comparison circuit whose inputs are coupled to at least outputs of the store containing the picture signal values for producing picture signal value differences, to an absolute-value circuit coupled to outputs of the comparison circuit for supplying the picture signal value differences, to an adaptive threshold circuit coupled to outputs of the absolute-value circuit and to a threshold value-adapting circuit an output of which is coupled to a threshold value input of the adaptive threshold for the supply of a threshold value which depends on the picture signal value differences, exceeding the adaptive threshold value being an indication of motion, characterized in that the adaptive threshold circuit has at least a horizontal or vertical threshold-value input coupled to an output of a horizontal or vertical maximum-value pass circuit, respectively, which forms part of the threshold value-adapting circuit inputs of which are coupled via an absolute-value circuit to outputs of a picture signal value comparison circuit, which, via a signal combining circuit and bypassing this circuit, is coupled to outputs of the picture store, said last picture signal value comparison circuit being operative for the horizontal maximum-value pass circuit with, relative to an instantaneous picture element, more of less adjacent picture elements in the line or horizontal direction and picture element values which are derived via the signal combining circuit from the picture elements of one of the more or less adjacent, superjacent or underlying lines belonging to the instantaneous, preceding or subsequent field period and also for the maximum-value pass circuit with, relative to the said instantaneous picture element, more or less adjacent picture elements in the field or vertical direction and picture element values which are derived via the signal combining circuit from the picture elements of one of the more of less adjacent, superadjacent or underlying lines belonging to the instantaneous, preceding or subsequent field period.