US 5,394,196 AGranted

Method of classifying the pixels of an image belonging to a sequence of moving images and method of temporal interpolation of images using the said classification

AssigneeThomson-CSF

InventorPhilippe Robert

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Abstract

The present invention relates to a method of classifying the pixels of an image belonging to a sequence of moving images, as well as to a method of temporal interpolation of images using this classification. The method of classifying the pixels of an image t(j+1) pertains to temporal projection of the field of motion of an image t(j) belonging to a sequence of moving images, with the pixels of the image t(j) being defined by a motion vector and by a tag belonging to a class such as "normal", "occluding" or "appearing". The method is characterized by the fact that, before projection, all pixels of t(j) are tagged "appearing", and then, during the temporal projection, the tagging is modified as a function of the tagging of the pixels of t(j) in such a way as to obtain a tagging according to the same above classes (i.e., normal, occluding, or appearing).

Claims15

Dependent claims

Method for classifying the pixels of a current image t(j+1) obtained by temporal projection of the field of motion of a preceding image t(j) belonging to a sequence of moving images, the pixels of the preceding image being defined by a motion vector and by a tag, the tag belonging to a class defined from at least three classes termed "normal", "occluding" or "appearing", the said method comprising the steps of:

before projection, all the pixels of the current image t(j) are tagged "appearing";
carrying out temporal projection of t(j);
modify tagging during temporal projection by taking into account the tagging of the pixels of the image t(j) in such a way that:
if a pixel tagged "appearing" receives a motion vector, change its tag to "normal";
if a pixel is tagged "normal" receives a motion vector, change its tag to "occluding" and assign it the motion vector with minimum .vertline.DFD.vertline. (for displaced frame difference);
if a pixel tagged "occluding" receives a motion vector, leave its tag as occluding and assign it the motion vector with minimum .vertline.DFD.vertline. and;
if a pixel tagged "appearing" receives no motion vector, leave the tag as "appearing".

4 more elements

Dependencies are inferred from the claim text.