skvideo.measure.strred¶

skvideo.measure.strred(referenceVideoData, distortedVideoData)[source]¶

Computes Spatio-Temporal Reduced Reference Entropic Differencing (ST-RRED) Index. [1]

Both video inputs are compared over frame differences, with quality determined by differences in the entropy per subband.

Parameters:

referenceVideoData : ndarray Reference video, ndarray of dimension (T, M, N, C), (T, M, N), (M, N, C), or (M, N), where T is the number of frames, M is the height, N is width, and C is number of channels. Here C is only allowed to be 1. distortedVideoData : ndarray Distorted video, ndarray of dimension (T, M, N, C), (T, M, N), (M, N, C), or (M, N), where T is the number of frames, M is the height, N is width, and C is number of channels. Here C is only allowed to be 1.

Returns:

strred_array : ndarray The ST-RRED results, ndarray of dimension ((T-1)/2, 4), where T is the number of frames. Each row holds spatial score, temporal score, reduced reference spatial score, and reduced reference temporal score. strred : float The final ST-RRED score if all blocks are averaged after comparing reference and distorted data. This is close to full-reference. strredssn : float The final ST-RRED score if all blocks are averaged before comparing reference and distorted data. This is the reduced reference score.

References

[1]	Soundararajan and A. C. Bovik, “Video Quality Assessment by Reduced Reference Spatio-temporal Entropic Differencing,” IEEE Transactions on Circuits and Systems for Video Technology, April 2013.