| 摘要 |
A picture of 625/50 format is converted to a picture of 525/60 format by a format converter provided halfway of the transmission link ( 1 ). By thinning scanning lines from the 625/50 format with a scanning line thinning means ( 2 ) on an input side of the transmission link ( 1 ) and then thinning fields from the format of 525/60 with a field (frame) thinning means ( 4 ) on an output side, the formats are matched with each other. After that, a picture quality characteristic amount is extracted by picture quality characteristic amount extracting portions ( 3 ), ( 5 ) and transmitted to a central monitoring room ( 6 ). A comparing means ( 7 ) of the central monitoring room ( 6 ) compares received picture quality characteristic amount so as to monitor a transmitted picture quality on a transmission link.
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