Patent ID: 7199819

Claim:
A device for automatically detecting picture degradation caused by video transmission, comprising: a first feature quantity extraction part that is provided on a transmitting side and extracts a feature quantity in a small region in a frame; a second feature quantity extraction part that is provided on a receiving side and extracts a feature quantity in the small region in the frame; and a monitoring chamber that receives the feature quantities extracted by the first and second feature quantity extraction parts through a data circuit, wherein the monitoring chamber includes: a degradation calculation part that compares the feature quantities received from the first and second feature quantity extraction parts and finds a degree of picture quality degradation; and a median filter that finds a median of the degree of picture quality degradation among a small region to be noticed and its predetermined neighboring small region to be noticed as the degree of picture quality degradation of the small region to be noticed, wherein local picture quality degradation of a picture can be detected.