Patent ID: 8553940
Filing Date: 2013-10-08
Classification: G06T

Abstract:
1. A method of forming a time-varying signal representative of at least variations in a value based on pixels and corresponding pixel values from a sequence of images, the signal corresponding in length to the sequence of images, the method comprising acts of: obtaining the sequence of images; forming a plurality of groups of sub-sets of pixels and corresponding pixel values by selecting a sub-set of at least one pixel and corresponding pixel value from each of at least two images defining an interval to form a group of associated sub-sets, wherein, for any pair of groups with only sub-sets from the same images, the sub-sets from more than one image are different pixels; and selecting groups of sub-sets to form the signal in accordance with at least one selection criterion, wherein the selected groups of sub-sets cover different intervals, shorter than a length of the sequence.