Video processing apparatus

A video processor for superimposing a graphic image on video,

• a video signal of the graphic image containing color information and degree of transparency information on a pixel-by-pixel basis, the processor comprising:
• a filtering section, which receives a 4:2:0 format video signal representing the video and which converts the video signal into one of a 4:2:2 format video signal and a 4:4:4 format video signal;
• a decision section, which receives the video signal representing the graphic image and which determines, by reference to the degree of transparency information, whether the graphic image should be superimposed on the video or not;
• a synthesizing section, which superimposes a color difference signal representing the graphic image on a color difference signal of the video signal that has been converted by the filtering section, thereby outputting a synthetic color difference signal;
• and
• a scaling section which performs scaling processing on the synthetic color difference signal,
• wherein depending on whether or not the decision section has decided that the graphic image be superimposed on the video, the filtering section and the scaling section change between a mode of processing to retain pixel data and location information of the color difference signal of the 4:2:0 format video signal and another mode of processing to retain not to retain the pixel data and location information.