Regional film cadence detection

摘要

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 f1 and f2 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.

主权项

1. An apparatus for classifying a temporal sampling pattern of a sequence of images that represents a moving image, wherein each image in the sequence is formed of a plurality of pixels, the apparatus comprising:
an inter-field difference unit in which each pixel of a plurality of pixels in an image in the sequence of images is compared with a corresponding pixel in a preceding image to derive a preceding inter-image pixel-value difference between the image and the preceding image and each pixel of said plurality of pixels in the image in the sequence of images is compared with a corresponding pixel in a succeeding image in the sequence of images to derive a succeeding inter-image pixel-value difference between the image and the succeeding image in the sequence of images; and a classification unit in which each pixel of a plurality of pixels in each image in the sequence of images is initially classified according to a relationship between the preceding inter-image pixel-value difference and the succeeding inter-image pixel-value difference; and said initial classification refined for each of the plurality of pixels in accordance with a relative number of pixels of the image initially classified into each of a plurality of classes, wherein the plurality of classes of temporal sampling patterns include: a film 1 where the preceding image corresponds to a same temporal sample as the image and the succeeding image corresponds to a different temporal sample than the image; a film 2 where the succeeding image corresponds to the same temporal sample as the image and the preceding image corresponds to a different temporal sample than the image; a video where the preceding image corresponds to a different temporal sample than the image and the succeeding image corresponds to a different temporal sample than the image; and a still where the preceding image and the succeeding image corresponds to the same temporal sample as the image.