Abstract
A method is described for extracting from a television signal an estimate of the velocity of moving images within the scene. The scene is first segmented into stationary and moving parts. Consider the horizontal component of velocity. Within the moving area the magnitude of the frame-difference signal for each element is summed in one of two separate accumulators. One accumulator is selected when the signs of the element-difference signal and the frame-difference signal are the same (movement to the left) while the other is selected when they are opposite (movement to the right). The horizontal component of velocity is then obtained by subtracting the contents of one accumulator from the other and dividing the result by the sum of the magnitude of the element-difference signal in the moving area. Provided some type of frame storage is available the method is particularly simple to implement, requiring only the operations of sign comparison and accumulation at the element rate and a subtraction and division at the end of the block being processed.
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