KEYSTONE COLLECTION CIRCUIT
PROBLEM TO BE SOLVED: To provide a keystone correction circuit which corrects to a normal aspect ratio even if the boundary between a video image and a screen is unclear. SOLUTION: The keystone correction circuit comprises: a coordinates calculator for calculating coordinates positions on the LCD pa...
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| creator | KIMURA TAKUSHI HIYOSHI TAKETO |
| description | PROBLEM TO BE SOLVED: To provide a keystone correction circuit which corrects to a normal aspect ratio even if the boundary between a video image and a screen is unclear. SOLUTION: The keystone correction circuit comprises: a coordinates calculator for calculating coordinates positions on the LCD panel at four vertexes of the video image distorted reversely, so that the distortion of a video image region on the screen is canceled out based on parameters, such as a vertical pitch angle θ and a horizontal one ; a parameter calculator for calculating a parameter required for arranging each pixel of video image data in the coordinates positions on the LCD panel at four vertexes obtained by the coordinates calculator; a keystone corrector for arranging the inputted video image data in the coordinates positions on the LCD panel at four vertexes to generate a video image output signal by using the parameters obtained by the parameter calculator; a guide video image generator for generating a guide video image, where the portion between adjacent coordinates is connected by a straight line in the coordinates on the LCD panel at four vertexes obtained by the coordinates calculating section; and an addition processor for adding the video image output signal to the guide video image, and for outputting the result. COPYRIGHT: (C)2007,JPO&INPIT |
| format | Patent |
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SOLUTION: The keystone correction circuit comprises: a coordinates calculator for calculating coordinates positions on the LCD panel at four vertexes of the video image distorted reversely, so that the distortion of a video image region on the screen is canceled out based on parameters, such as a vertical pitch angle θ and a horizontal one ; a parameter calculator for calculating a parameter required for arranging each pixel of video image data in the coordinates positions on the LCD panel at four vertexes obtained by the coordinates calculator; a keystone corrector for arranging the inputted video image data in the coordinates positions on the LCD panel at four vertexes to generate a video image output signal by using the parameters obtained by the parameter calculator; a guide video image generator for generating a guide video image, where the portion between adjacent coordinates is connected by a straight line in the coordinates on the LCD panel at four vertexes obtained by the coordinates calculating section; and an addition processor for adding the video image output signal to the guide video image, and for outputting the result. 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SOLUTION: The keystone correction circuit comprises: a coordinates calculator for calculating coordinates positions on the LCD panel at four vertexes of the video image distorted reversely, so that the distortion of a video image region on the screen is canceled out based on parameters, such as a vertical pitch angle θ and a horizontal one ; a parameter calculator for calculating a parameter required for arranging each pixel of video image data in the coordinates positions on the LCD panel at four vertexes obtained by the coordinates calculator; a keystone corrector for arranging the inputted video image data in the coordinates positions on the LCD panel at four vertexes to generate a video image output signal by using the parameters obtained by the parameter calculator; a guide video image generator for generating a guide video image, where the portion between adjacent coordinates is connected by a straight line in the coordinates on the LCD panel at four vertexes obtained by the coordinates calculating section; and an addition processor for adding the video image output signal to the guide video image, and for outputting the result. COPYRIGHT: (C)2007,JPO&INPIT</abstract><oa>free_for_read</oa></addata></record> |
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| language | eng |
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| subjects | ACCESSORIES THEREFOR APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM CINEMATOGRAPHY ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY ELECTROGRAPHY HOLOGRAPHY PHOTOGRAPHY PHYSICS PICTORIAL COMMUNICATION, e.g. TELEVISION |
| title | KEYSTONE COLLECTION CIRCUIT |
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