Abstract: In a method of interpolating sample values (f) of samples (Pi, Pot) of an image, a direction of a local gradient (8) of the sample values (f) for a particular one of the samples (Pi, Pot) is determined (1) from sample values (f) neighboring the particular one of the samples (Pi, Pot). The positions of interpolator input values (ai) are selected (20) in the direction of the local gradient (8) of the particular one of the samples (Pi, Pot). The interpolator input values (ai) for the particular one of the samples (Pi, Pot) are interpolated (21) from pixel values (f) neighboring the interpolator input values (ai). And, a warping factor (A) for a warped distance interpolating (3) is determined (22) using the interpolator input values (ai).

Abstract: A method of distinguishing areas of natural and synthetic content in video information represented by pixels arranged in a matrix of lines is disclosed. A luminance histogram (hist(L)) of pixel values for each line of the matrix is created. The distances (d) between each of the histogram values for each line are then determined. A line is classified as containing natural content if the majority of distances (d) is less than or equal to a predetermined value. Neighboring lines containing natural content are then grouped together to create groups of natural content. The process can then be repeated a predetermined number of times to more precisely define areas with natural content.