Patent Document ID: 6034740
Application ID: 08739274
Patent Status: 1

Claim One:
1. A keying system comprising: means for gaining an image of an object; a memory device for preliminary storing a plurality of background images each being obtained correspondingly to at least one of a view angle of a view point in a three-dimensional space to be imaged and a view position of the view point therein; a buffer memory capable of storing at least one frame of the background image thereon; first reading means for selectively reading at least one image at a given timing from the plurality of background images stored in the memory device according to the at least one of the view angle and the view position preliminary both defined in accordance with the image of the object; storage means for storing the at least one image read by the first reading means on the buffer memory; means for judging whether or not the at least one of the defined angle and the defined position on the image of the object is changed within predetermined limits corresponding to a predetermined number of pixels; second reading means for reading the at least one image stored in the buffer memory with shifting the at least one image by at least one pixel each along a direction of the change in case that the at least one of the defined angle and the defined position is changed within the predetermined limits; third reading means for selectively reading at least one image at the given timing from the plurality of background images stored in the memory device according to the at least one of the defined angle and the defined position in case that the at least one of th e defined angle and the defined position is c hanged over the predetermined limits, first keying-composition means for performing a keying composition between the at least one image read by the second reading means and the image of the object thereby producing a composite image; and second keying-composition means for performing a keying composition between the at least one image read by the third reading means and the image of the object thereby producing a composite image.