The temporal sampling pattern of a sequence of images that represents a moving scene is classified into classes of temporal sampling patterns including "film", "video" and "still". Pixels in each image in the said sequence are classified according to the relationship between signed inter-image pixel-value differences f 1 and f 2 between that image and, respectively, the preceding and succeeding images in the sequence. An initial classification for each pixel may be refined in accordance with the relative numbers of pixels of the image initially classified into each class.
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