DEVICE FOR MONITORING TRANSMISSION PICTURE QUALITY

Japanese Patent JP3838516

B2

PROBLEM TO BE SOLVED: To remotely monitor, with high accuracy, the transmission picture quality on a transmission line based on a picture quality feature amount of video in each spot even when transmitting video of fine pattern and fast movement or the like on the transmission line including a system conversion apparatus.
SOLUTION: A video image of 625/50 system is converted into a video image of 525/60 system in the middle of a transmission line 1 and transmitted. When comparing, in a comparing/determination means 7 of a central monitoring unit 5, picture quality feature amounts extracted by picture quality feature amount extracting means 3 and 4, a scanning line thinning means 2 and a field (frame) thinning means 6 conform the formats of the both systems apparently. A signal distribution/correlation coefficient computing means 8 determines signal distribution and correlation coefficients of the video image. The comparing/determination means 7 of the central monitoring unit 5 compares the picture quality feature amounts to determine a PSNR estimate and compares a signal distribution value with a PSNR predictive value determined from the correlation coefficient value to monitor the transmission picture quality on the transmission line.

Ryoichi Kawada
Osamu Sugimoto
Atsushi Koike

JP2004159219A

October 25, 2006

May 28, 2004

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KDDI CORPORATION

H04N17/00; H04N7/01; (IPC1-7): H04N17/00; H04N7/01

JP2002077949A
JP7274121A
JP2003087823A
JP2000184365A
JP2003179951A
JP11289560A

Kaori Tanaka
Michito Hiraki
Sanji Tanabe

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