VERFAHREN ZUR MESSUNG VON RAUSCHEN IN EINEM AKTIVEN VIDEOBILD

PCT No. PCT/FR91/00756 Sec. 371 Date Mar. 29, 1993 Sec. 102(e) Date Mar. 29, 1993 PCT Filed Sep. 27, 1991 PCT Pub. No. WO92/06558 PCT Pub. Date Apr. 16, 1992.A method of measuring the noise in an active video image. During a given processing period, for each pixel of a video image considered to be s...

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1. Verfasser: HACKETT, ANDREW, F-92045 PARIS-LA DEFENSE CEDEX 67, FR
Format: Patent
Sprache:ger
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Zusammenfassung:PCT No. PCT/FR91/00756 Sec. 371 Date Mar. 29, 1993 Sec. 102(e) Date Mar. 29, 1993 PCT Filed Sep. 27, 1991 PCT Pub. No. WO92/06558 PCT Pub. Date Apr. 16, 1992.A method of measuring the noise in an active video image. During a given processing period, for each pixel of a video image considered to be stationary, the difference fd between the video signal corresponding to this pixel and the video signal corresponding t the pixel at the same spatial position in a preceding image is calculated. The square of the absolute value of the difference is calculated so as to obtain a value |fd|2, and the value |fd|2 is added to previously obtained values so as to form a sum value SIGMA |fd|2. The above operations are repeated until the number of pixels processed is equal to a given threshold value N0, or until the end of the processing period. At the end of the processing period, if the number of pixels processed is equal to the threshold value, the value SIGMA |fd|2 is used to determine a reference point giving a new noise-reduction coefficient kmin, otherwise the former reference point is kept. The invention applies especially to television.