Video Quality Inspector is an automated Perceptual Video Quality Testing Tool. VQMg (Video Quality Metrics – General Model) and VQGD (Video Quality Glitch Detection) are two components of Video Quality Inspector.
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VQMg (Video Quality Metrics – General Model) is based on ITU J.144 algorithm. The device that is to be tested is called the device under test (DUT).Other device is fine tuned and adjusted to achieve ideal results so the deviation in device under test can be measured and verified. The test system compares the output of the device under test to the reference video image with the help of video quality assessment algorithm and provides a VQMg rating score on a scale of 0 to 1. VQGD - Video Quality Glitch Detection looks for the impairments in the output video. Video Quality Inspector calculates metrics like PSNR(peak signal to noise ratio), SSIM (Structural SIMilarity index). These metrics capture certain impairment visible only in single frames scattered across the video clip. Video impairments can be of different type like Black Line, Black Column, Frozen Frames, and Black/Green Frames.