| 摘要 |
PURPOSE:To synthesize and display an image from an external device while securing operability. CONSTITUTION:Video input 10 from an external device and an RGB range 14 from a host computer are compared with each other and are judged by a comparator 16. The comparator 16 referes to a color number table according to the color number supplied as the RGB range 14, and sets a level range being a reference to compare and judge the video input 10. When a level of the video input 10 falls within a preset level range, the comparator 16 selects the video input 10 by an analog switch 18, and outputs it as video output 20, and outputs video input 12 as the video output 20 except that. |
