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    • 9. 发明专利
    • METHOD FOR CORRECTING PICTURE DISTORTION
    • JPS6265567A
    • 1987-03-24
    • JP20464285
    • 1985-09-17
    • NIPPON TELEGRAPH & TELEPHONE
    • HASE MASAHIKOIZUMIOKA IKUAKISUZUKI HAJIME
    • H04N5/222H04N5/225
    • PURPOSE:To correct picture distortion due to an angle difference between the image pickup plane of an input device, such as a television camera, etc. and the plane of an object by performing a coordinate conversion between a coordinate on the plane of the object and that on the plane projected on the image pickup plane by a specified expression. CONSTITUTION:When the object on a square ABCD that is inclined by angle of theta against the image pickup plane 1 of the television camera is photographed, the object is photographed as if it is on a trapezoid ABEF, being photographed in a distorted shape compared with an actual shape. An expressional relation exists between the points (x) and (y) on the square ABCD and points x' and y' on the trapezoid ABEF and if a distance L, a width W and an inclination angle theta are given, an original object can be reproduced from an image photographed on the image pickup plane. In a moving picture transmission device, such as a visual telephone, etc., the image inputted from an image inputting camera 12 is corrected referring a conversion table written on a fixed memory 9 through an A/D converter 2 and is accumulated on a frame memory 4 and through a D/A converter 3, it is displayed on a picture display device 13.