full-reference image metric
(original is much brigther) -1..1 (distorted is much brigther)
bigger is darker original, 0 - same brightness
CPU multithreaded
pixel-wise
R, G, B, Y, U, V, L
metric value
standard set
-metr delta [over <color components>]
mean difference
The value of this metric is the mean difference of the color value in the corresponding points of image.
where – video width, – video height, image data are in range 0..1. This formula can be rewriten to the following way: .
This metric doesn’t show a quality loss, because it can be 0 for completely different images, but you can detect general brightness shifts using this metric if you are sure images have same structure.
Implementation | System & settings | Colors | Resolution | FPS | Sec. per frame |
---|---|---|---|---|---|
VQMT 14.0 default | multithreaded | Y | HD 720p | 557.44 | 0.003 |
VQMT 14.0 default | multithreaded | Y | FullHD 1080p | 272.49 | 0.005 |
VQMT 14.0 default | multithreaded | Y | 4K 2160p | 58.9 | 0.019 |
VQMT 14.0 default | singlethreaded | Y | HD 720p | 179.48 | 0.007 |
VQMT 14.0 default | singlethreaded | Y | FullHD 1080p | 88.64 | 0.012 |
VQMT 14.0 default | singlethreaded | Y | 4K 2160p | 22.82 | 0.046 |
Implementation | System & settings | Colors | Resolution | FPS | Sec. per frame |
---|---|---|---|---|---|
VQMT 13.1 default | multithreaded | Y | HD 720p | 568.83 | 0.003 |
VQMT 13.1 default | multithreaded | Y | FullHD 1080p | 260.59 | 0.005 |
VQMT 13.1 default | multithreaded | Y | 4K 2160p | 54.22 | 0.02 |
VQMT 13.1 default | singlethreaded | Y | HD 720p | 181.75 | 0.006 |
VQMT 13.1 default | singlethreaded | Y | FullHD 1080p | 88.77 | 0.012 |
VQMT 13.1 default | singlethreaded | Y | 4K 2160p | 23.25 | 0.045 |
Implementation | System & settings | Colors | Resolution | FPS | Sec. per frame |
---|---|---|---|---|---|
VQMT 14.0 default | multithreaded | Y | HD 720p | 1271.1 | 0.002 |
VQMT 14.0 default | multithreaded | Y | FullHD 1080p | 646.32 | 0.004 |
VQMT 14.0 default | multithreaded | Y | 4K 2160p | 119.24 | 0.016 |
VQMT 14.0 default | singlethreaded | Y | HD 720p | 152.69 | 0.007 |
VQMT 14.0 default | singlethreaded | Y | FullHD 1080p | 66.5 | 0.015 |
VQMT 14.0 default | singlethreaded | Y | 4K 2160p | 20.66 | 0.05 |
Since VQMT 12 metric uses input range 0..1. In legacy mode is assumed input range to be 0..255 and 0..100 for L channel.