| 摘要 |
PROBLEM TO BE SOLVED: To reduce a data bandwidth in a shared memory without degrading image quality in an image display unit having the shared memory for displaying a plurality of frames with superposition, thus preventing a unit cost from increasing. SOLUTION: When at least two images are superposed and displayed, the image display unit additionally has a means for designating selection information of on a pixel posterior to superposition or either of the pixels of two images prior to superposition on a pixel-by-pixel basis; and a means for generating information on the range of the superposed images at the time of display based on a table having in advance a rendering area in an image for superposition on a rendering element basis and based on the above information, and generating the pixel selection information and image readout information representing a necessary portion for displaying the superposed image. Using the pixel selection information and the image readout information generated by the generation means, only an object image to be superposed is displayed without the readout and display of a transparent pixel in the image for superposition. COPYRIGHT: (C)2004,JPO
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