SI (Spatial Information)

General info

Metric type

no-reference image metric

Value range

(simple, monotone frame) 0..1 (very complex frame)

Value interpretation

bigger more complex frame

MSU VQMT implementations

CPU multithreaded

MSU VQMT visualization

pixel-wise, sobel transformation

Available colorspaces

Y

Output values

metric value

Aggregated values

standard set

MSU VQMT usages

-metr si

External links

ITU-T Recommendation P.910: Subjective video quality assessment methods for multimedia applications, 1999. – 37 p.

Algorithm description

This metric measures complexity (entropy) of an input image. This metric represents simplest SI realization that takes standard deviation of sequence of pixel values (Y-component) of Sobel transformation of input image:

is length of vector , where and are horizontal and vertical Sobel transformation. While calculating Sobel, the edge pixels will be excluded from calculation.

Benchmark

Choose benchmark:
Implementation System & settings Colors Resolution FPS Sec. per frame
VQMT 14.0 SI multithreaded Y HD 720p 368.29 0.004
VQMT 14.0 SI multithreaded Y FullHD 1080p 168.04 0.007
VQMT 14.0 SI multithreaded Y 4K 2160p 42.4 0.025
VQMT 14.0 SI singlethreaded Y HD 720p 81.06 0.013
VQMT 14.0 SI singlethreaded Y FullHD 1080p 36.8 0.028
VQMT 14.0 SI singlethreaded Y 4K 2160p 11.64 0.091
Measurements were done on VQMT 14.0 BETA r12792 PRO for Windows.
CPU: Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz, 8 cores
GPU: NVIDIA CUDA/GeForce GTX 660 Ti
Values can vary depending on system configuration, input format and other factors
Implementation System & settings Colors Resolution FPS Sec. per frame
VQMT 13.1 SI multithreaded Y HD 720p 371.38 0.003
VQMT 13.1 SI multithreaded Y FullHD 1080p 169.24 0.007
VQMT 13.1 SI multithreaded Y 4K 2160p 42.15 0.025
VQMT 13.1 SI singlethreaded Y HD 720p 81.56 0.013
VQMT 13.1 SI singlethreaded Y FullHD 1080p 36.85 0.028
VQMT 13.1 SI singlethreaded Y 4K 2160p 11.7 0.089
Measurements were done on VQMT 13.1 r12792 PRO for Windows.
CPU: Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz, 8 cores
GPU: NVIDIA CUDA/GeForce GTX 660 Ti
Values can vary depending on system configuration, input format and other factors
Implementation System & settings Colors Resolution FPS Sec. per frame
VQMT 14.0 SI multithreaded Y HD 720p 1301.78 0.002
VQMT 14.0 SI multithreaded Y FullHD 1080p 693.15 0.003
VQMT 14.0 SI multithreaded Y 4K 2160p 176.92 0.01
VQMT 14.0 SI singlethreaded Y HD 720p 83.92 0.012
VQMT 14.0 SI singlethreaded Y FullHD 1080p 39.49 0.026
VQMT 14.0 SI singlethreaded Y 4K 2160p 14.64 0.07
Measurements were done on VQMT 14.0 BETA r12792 PRO for Linux.
CPU: Intel(R) Xeon(R) Silver 4216 CPU @ 2.10GHz, 64 cores
GPU: NVIDIA CUDA/TITAN RTX
Values can vary depending on system configuration, input format and other factors

Example

Choose example:
Download (orig | dist | vis | animation)
Original, SI-y=0.0335
LQ H264, SI-y=0.0233
MSU VQMT visualization
Download (orig | dist | vis | animation)
Original, SI-y=0.0335
Blurring, SI-y=0.0102
MSU VQMT visualization
Download (orig | dist | vis | animation)
Original, SI-y=0.0335
Random points, SI-y=0.0364
MSU VQMT visualization
Download (orig | dist | vis | animation)
Original, SI-y=0.0335
Luminance shift, SI-y=0.0335
MSU VQMT visualization
Download (orig | dist | vis | animation)
Original, SI-y=0.0335
JPEG Q=2, SI-y=0.0380
MSU VQMT visualization
Download (orig | dist | vis | animation)
Original, SI-y=0.0335
JPEG Q=5, SI-y=0.0348
MSU VQMT visualization
Download (orig | dist | vis | animation)
Original, SI-y=0.0335
JPEG Q=10, SI-y=0.0338
MSU VQMT visualization
Download (orig | dist | vis | animation)
Original, SI-y=0.0335
JPEG Q=15, SI-y=0.0333
MSU VQMT visualization
Download (orig | dist | vis | animation)
Original, SI-y=0.0335
JPEG Q=20, SI-y=0.0333
MSU VQMT visualization
Download (orig | dist | vis | animation)
Original, SI-y=0.0335
JPEG Q=40, SI-y=0.0335
MSU VQMT visualization
Download (orig | dist | vis | animation)
Original, SI-y=0.0335
JPEG Q=80, SI-y=0.0336
MSU VQMT visualization
Choose example:
Download (orig | dist | vis | animation)
Original, SI-y=0.0626
LQ H264, SI-y=0.0592
MSU VQMT visualization
Download (orig | dist | vis | animation)
Original, SI-y=0.0626
Blurring, SI-y=0.0264
MSU VQMT visualization
Download (orig | dist | vis | animation)
Original, SI-y=0.0626
Random points, SI-y=0.0649
MSU VQMT visualization
Download (orig | dist | vis | animation)
Original, SI-y=0.0626
Luminance shift, SI-y=0.0626
MSU VQMT visualization
Download (orig | dist | vis | animation)
Original, SI-y=0.0626
JPEG Q=2, SI-y=0.0718
MSU VQMT visualization
Download (orig | dist | vis | animation)
Original, SI-y=0.0626
JPEG Q=5, SI-y=0.0653
MSU VQMT visualization
Download (orig | dist | vis | animation)
Original, SI-y=0.0626
JPEG Q=10, SI-y=0.0631
MSU VQMT visualization
Download (orig | dist | vis | animation)
Original, SI-y=0.0626
JPEG Q=15, SI-y=0.0627
MSU VQMT visualization
Download (orig | dist | vis | animation)
Original, SI-y=0.0626
JPEG Q=20, SI-y=0.0626
MSU VQMT visualization
Download (orig | dist | vis | animation)
Original, SI-y=0.0626
JPEG Q=40, SI-y=0.0624
MSU VQMT visualization
Download (orig | dist | vis | animation)
Original, SI-y=0.0626
JPEG Q=80, SI-y=0.0625
MSU VQMT visualization
Choose example:
Download (orig | dist | vis | animation)
Original, SI-y=0.0631
LQ H264, SI-y=0.0244
MSU VQMT visualization
Download (orig | dist | vis | animation)
Original, SI-y=0.0631
Blurring, SI-y=0.0203
MSU VQMT visualization
Download (orig | dist | vis | animation)
Original, SI-y=0.0631
Random points, SI-y=0.0650
MSU VQMT visualization
Download (orig | dist | vis | animation)
Original, SI-y=0.0631
Luminance shift, SI-y=0.0631
MSU VQMT visualization
Download (orig | dist | vis | animation)
Original, SI-y=0.0631
JPEG Q=2, SI-y=0.0634
MSU VQMT visualization
Download (orig | dist | vis | animation)
Original, SI-y=0.0631
JPEG Q=5, SI-y=0.0610
MSU VQMT visualization
Download (orig | dist | vis | animation)
Original, SI-y=0.0631
JPEG Q=10, SI-y=0.0602
MSU VQMT visualization
Download (orig | dist | vis | animation)
Original, SI-y=0.0631
JPEG Q=15, SI-y=0.0603
MSU VQMT visualization
Download (orig | dist | vis | animation)
Original, SI-y=0.0631
JPEG Q=20, SI-y=0.0603
MSU VQMT visualization
Download (orig | dist | vis | animation)
Original, SI-y=0.0631
JPEG Q=40, SI-y=0.0614
MSU VQMT visualization
Download (orig | dist | vis | animation)
Original, SI-y=0.0631
JPEG Q=80, SI-y=0.0624
MSU VQMT visualization

Legacy notes

In VQMT 12 metric was optimized, consider correct range, added legacy mode.