The new method to measure the SN ratio of a television picture

Abstract

Our new developed noise reducer which is named a dc-shift-NR, reduces noise by shifting a local signal level in accordance with the noise level, We have successfully developed the dc-shift-NR in a MUSE decoder, which detects the noise level caused by a transmission, using a known level in a vertical blanking area. The detection of a noise level in a real moving picture is a big problem in order to apply the dc-shift-NR for a real TV picture. We propose a new detection method of noise level in a real moving picture based on a statistical distribution test. The computer simulated experiments show good results, which open a possibility of the dc-shift-NR for a TV picture.