Output

• PEVQ MOS
  The PEVQ MOS value lies within a range from 1 (bad) to 5 (excellent). The PEVQ MOS is based on a multitude of perceptually motivated parameters and is calculated according to ITU-T Rec. J.247.
• Distortion indicators
  For a more detailed analysis the perceptual level of distortion in the luminance, chrominance and temporal domain are provided.
• Delay
  The delay of each frame of the test signal related to the reference signal.
• Brightness
  The brightness of the reference and degraded signal.
• Contrast
  The contrast of the distorted and the reference sequence.
• PSNR
  To allow for a coarse analysis of distortions in different domains the PSNR is provided for the Y, Cb and Cr components separately.
• Jerkiness
  describes the smoothness of a video playback which is often impaired by down-sampling, coding processes and perturbed transmissions.
• Blur
  is a distortion characterized by reduced sharpness of contour edges and spatial detail.
• Blockiness
  is often the result of a low bit rate coding that uses a block matching algorithm for the motion estimation and a coarse quantization for the image blocks.
• Frame Skips and Freezes
  are temporal artefacts occurring in video transmissions caused by e.g. overloaded networks.
• Effective Frame Rate
  Down-sampling of a video signal on a frame by frame basis often results in loss of information which often leads to the degradation of the video signal. The effective frame rate is an indicator quantifying the severeness of such a process.
• Temporal and Spacial Activity
  Temporal and spacial activity indicators quantify the amount of activity /movement in the video content. These indicators are derived from ITU-T recommendation P.910.

[More information about OPTICOM's voice, audio and video quality testing]