Patent ID: 7123273

Claim:
An overlay image processing device for generating an overlay image signal composed of an n number of selected image signals, n being an integer greater than 2, the overlay image processing device comprising: a plurality of digital decoders configured to digitally decode a plurality of image signals; an image selector configured to directly receive outputs from each of the plurality of digital decoders and configured to select from among the plurality of digitally decoded image signals one (1) reference image signal and (n−1) number of superimposing image signals; a plurality of resolution converters configured to directly receive the selected image signals output from the image selector, such that each resolution converter can input any of the respective outputs, to convert resolutions of the n number of selected image signals into respective adjustable desired resolutions, and to output the converted image signals to an image synthesizer, wherein the image synthesizer is configured to superimpose the (n−1) number of converted superimposing image signals on the converted one (1) reference signal, and the image selector is configured to connect each of the digital decoders to any of the resolution converters.