Patent ID: 7084927

Claim:
A video processing method for generating output images for display, an output image having one or more regions derived from a first source image separated by a wipe boundary from one or more regions derived from a second source image, each display position of said source images having an associated transparency coefficient, said method comprising the steps of: (i) preparing said first source image for display in a display memory; (ii) defining a wipe origin locus representing a wipe boundary when substantially all of said output image is derived from said first source image and a wipe destination locus representing a wipe boundary when substantially all of said output image is derived from said second source image, points on said wipe destination locus being associated with points on said wipe origin locus, each such pair of associated points defining a respective wipe progression direction; (iii) generating a wipe control signal defining proportions of said first and second source images to be displayed with respect to a normalised display distance along a wipe progression direction from said wipe origin locus and said wipe destination locus; (iv) modifying said transparency coefficient of said first source image held in said display memory, said transparency coefficient of each display position being modified in dependence on value of said wipe control signal corresponding to said normalised display distance along said wipe progression direction between that display position and said wipe origin locus and between that display position and said wipe destination locus; (v) writing said second source image over said first source image in said display memory so that said first source image is modified by pixels of said second source image in dependence on said transparency coefficient associated with each display position of said first source image.