Patent ID: 6377621
Filing Date: 2002-04-23
Classification: H04N

Abstract:
A method of interpolating in processing of video or film signals comprising:storing input pixel values of an input signal in an input store, assigning a motion vector to each set of output coordinates to be interpolated, providing an indication of a degree of reliability of each said assigned motion vector, wherein the degree of reliability has a predetermined upper and lower limit, and wherein the degree of reliability may be assigned at least one intermediate value between the upper and lower limits, modifying a temporal coordinate of each said set of output coordinates depending on the degree of reliability of the corresponding assigned motion vector, and selecting at least one pixel value from the input store depending on the assigned motion vector and the modified temporal output coordinate, an interpolated output pixel value being determined from said at least one pixel value; wherein each said temporal coordinate is modified using a lookup table, a transfer characteristic of which is determined by the degree of reliability of the corresponding motion vector; and wherein the transfer characteristic used to modify each said temporal coordinate is given by the following equation: Ï†out=12&it;(1-tanh&it;â€ƒ&it;(arctanh&af;(2&it;Ï†in-1)r)).