Methods, Systems and Apparatus for Automatic Video Quality Assessment
First Claim
1. A method for determining a quality index for a test video sequence, said method comprising:
- receiving, in a processor, a test video sequence;
receiving, in said processor, a reference video sequence corresponding to said test video sequence;
in said processor, calculating a spatial quality index using said test video sequence and said reference video sequence;
in said processor, calculating a temporal quality index using said test video sequence and said reference video sequence; and
in said processor, combining said spatial quality index and said temporal quality index to form a final quality index for said test video sequence.
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Abstract
Aspects of the present invention are related to systems, methods and apparatus for automatic quality assessment of a video sequence. According to a first aspect of the present invention, a quality index may be generated by combining a spatial quality index and a temporal quality index. According to a second aspect of the present invention, a spatial quality index may be calculated using a modified exponential moving average model to pool multi-scale structural similarity indices computed from test frame—reference frame pairs. According to a third aspect of the present invention, a temporal quality index may be generated by averaging multi-scale structural similarity indices computed from difference image pairs, wherein one difference image is formed between reference frames and another difference image is formed between a reference frame and a test frame.
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Citations
20 Claims
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1. A method for determining a quality index for a test video sequence, said method comprising:
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receiving, in a processor, a test video sequence; receiving, in said processor, a reference video sequence corresponding to said test video sequence; in said processor, calculating a spatial quality index using said test video sequence and said reference video sequence; in said processor, calculating a temporal quality index using said test video sequence and said reference video sequence; and in said processor, combining said spatial quality index and said temporal quality index to form a final quality index for said test video sequence. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for determining a quality index for a test video sequence, said method comprising:
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receiving, in a processor, a test video sequence, wherein said test video sequence comprises a first plurality of image frames; receiving, in said processor, a reference video sequence corresponding to said test video sequence, wherein said reference video sequence comprises a second plurality of image frames; and in said processor, calculating a spatial quality index using said test video sequence and said reference video sequence, wherein said calculating comprises; calculating a multi-scale structural similarity (MS-SSIM) index for each image frame in said first plurality of image frames and a temporally corresponding image frame in said second plurality of image frames, thereby producing a plurality of MS-SSIM indices; pooling said plurality of MS-SSIM indices, thereby producing a plurality of pooled MS-SSIM indices; determining a minimum value from said plurality of MS-SSIM indices; and setting said spatial quality index to said minimum value. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method for determining a quality index for a test video sequence, said method comprising:
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receiving, in a processor, a test video sequence, wherein said test video sequence comprises a first plurality of image frames; receiving, in said processor, a reference video sequence corresponding to said test video sequence, wherein said reference video sequence comprises a second plurality of image frames; and in said processor, calculating a temporal quality index using said test video sequence and said reference video sequence, wherein said calculating comprises; forming a first reference difference image between a first image frame in said second plurality of image frames and a second image frame in said second plurality of image frames, wherein said second image frame is an immediately temporally previous image frame to said first image frame in said second plurality of image frames; forming a first test difference image between a test image frame in said first plurality of image frames, wherein said test image frame corresponds temporally to said first image frame, and said second image frame; calculating a multi-scale structural similarity (MS-SSIM) index using said first reference difference image and said first test difference image; and averaging said MS-SSIM index with a plurality of previously calculated MS-SSIM indices. - View Dependent Claims (18, 19, 20)
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Specification