25-04-2013 дата публикации
Номер: US20130100350A1
The purpose of an objective video quality evaluation is to automatically assess the quality of video sequences in agreement with human quality perception. The invention addresses the effects of the introduction of a temporal dimension by focusing on the temporal evolutions of spatial distortions, since it has been found that a spatial quality variation cannot be evaluated by simple subtraction of the spatial quality of neighbouring frames. An improved method for estimating perceived video quality comprises steps of calculating a first similarity map between adjacent frames of a current sequence, calculating a second similarity map between the corresponding reference frames, and calculating (smg) a third similarity map, which provides a numerical quality value. 1. A method for measuring video quality of a sequence of distorted video pictures , wherein the respective video pictures are also available as undistorted video pictures , comprising steps ofdividing the pictures into blocks of equal size;{'sub': 'sim,1', 'o': {'@ostyle': 'single', 'CM'}, 'generating a first similarity map, wherein the blocks of a distorted picture f and the corresponding collocated blocks of a temporally neighboring distorted picture f′ are input to a first similarity function f(f,f′)= (f,f′) that outputs a first similarity map;'}{'sub': 0', '0', 'sim,1', '0', '0', '0', '0, 'o': {'@ostyle': 'single', 'CM'}, 'generating a second similarity map, wherein the blocks of an undistorted picture fand the corresponding collocated blocks of a temporally neighboring undistorted picture f′are input to the first similarity function f(f,f′)= (f,f′) that outputs a second similarity map;'}{'sub': sim,2', 'variation', 'sim', '0', '0, 'sup': '2', 'o': [{'@ostyle': 'single', 'CM'}, {'@ostyle': 'single', 'CM'}], 'calculating the similarity between the first similarity map and the second similarity map, wherein a second similarity function f(X,Y) is used according to VQM=f( (f,f′), (f,f′)) and wherein a single ...
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