| 摘要 |
PCT No. PCT/FR91/00022 Sec. 371 Date Oct. 22, 1991 Sec. 102(e) Date Oct. 22, 1991 PCT Filed Jan. 14, 1991 PCT Pub. No. WO91/11075 PCT Pub. Date Jul. 25, 1991.The device for implementation of the invention procedure, a processor (2) is connected by a data bus (12) to a correction memory (3), a measuring circuit (9), and a digital-to-analog converter (4), and an adder circuit is connected to the output of the digital-to-analog converter (4) and to the output of the scanning circuit of the camera, so as to add to the sawtooth signal supplied by the camera the correction values furnished by the correction memory in synchrony with the scanning of the camera. The correction values result from an evaluation of the position error of the centers of the patterns of an optical grid as restored by the camera and of their equivalents in an electronic grid. Intermediate correction values are computed for each pattern by interpolation of the position errors of the centers of the patterns, using a third-order interpolation polynomial. The invention can be used in high-definition television applications.
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