| 摘要 |
PURPOSE:To change the sequence of the superposition of an image arbitrarily at high speed by detecting the transparency/opaqueness of every picture element of a correspondent memory device for image display, and sending out the picture element of a specific device as image superposition display output corresponding to detected output. CONSTITUTION:Display control means 40-1 to 40-n send out the sole opaque picture element as it is as the image superposition display output when the picture element of a certain device is opaque and the picture elements of other devices are transparent out of the images to be superimposed and displayed based on the detected output from plural detecting means 30-1 to 30-n when the images of plural memory devices 10-1 to 10-n for image display are superimposed and displayed, and also, send out the picture element of the memory device for image display with the highest priority as the image superposition display output according to priority supplied to each of those devices, respectively by setting means 50-1 to 50-n when the picture elements of the plural memory devices for image display are opaque. In such a way, the arbitrary change of the sequence of the superposition of the image can be performed at high speed. |
