User manual OPTICOM CB01 SPECIFICATION DATA

[. . . ] Lab users can choose between the PEXQ software suite and the PEVQ analyzer hardware. PEVQ evaluates the quality of multimedia (QCIF, CIF, VGA), SD and HD video formats based on perceptual measurement, reliably, objectively and fast. PEVQ is based on the earlier PVQM technology developed by KPN Research and new developments of OPTICOM. Video Quality Testing Data Quality Testing OPTICOM Product Line: Voice Quality Testing PSQM ITU-T P. 861 CB01 ITU-T P. 862 3SQM ITU-T P. 563 ECHO Audio Quality Testing PEAQ ITU-T BS. 1387 Video Quality Testing PEVQ Network Quality Testing VQmon Principle PEVQ is a full reference, intrusive measurement algorithm for video quality. [. . . ] The first block ­ pre-processing stage ­ is responsible for the spatial and temporal alignment of the reference and the impaired signal. This process ensures that only corresponding frames are compared to each other. The second block calculates the perceptual difference of the aligned signals. Perceptual means that only those differences are taken into account which are actually perceived by a human viewer. Furthermore the activity of the motion in the reference signal provides another indicator representing the temporal information. This indicator is important as it takes into account that in frame series with low activity the perception of details is much higher than in frame series with quick motion. The third block in the figure classifies the previously calculated indicators and detects certain types of distortions. Finally, in the fourth block all the appropriate indicators according to the detected distortions are aggregated, forming the final result - the mean opinion score (MOS). The MOS value describes the video quality on a range from 1 for very bad quality, to 5 for excellent quality. · Available as DLL/Library, WindowsTM software and PEVQ analyzer hardware · Applications: IPTV, streaming video, 3G, video telephony · Performance verified and recommended for standardization by the Video Quality Experts Group (www. vqeg. org) 2008 PEXQTM, 3SQMTM, PEAQTM, PEVQTM, PEDQTM and the OPTICOM logo are registered trademarks of OPTICOM GmbH; CB01TM is a registered trademark of OPTICOM GmbH and Psytechnics Ltd. ; the 'Single-sided Speech Quality Measure' and 'The Perceptual Quality Experts' are trademarks of OPTICOM GmbH. 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. 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 Activity and Spatial Complexity Temporal activity and spatial complexity indicators quantify the amount of activity/movement and spatial detail in the video content. [. . . ] Temporal Activity and Spatial Complexity Temporal activity and spatial complexity indicators quantify the amount of activity/movement and spatial detail in the video content. These indicators are derived from ITU-T recommendation P. 910. Sales Contacts: OPTICOM GmbH Nägelsbachstraße 38 91052 Erlangen, GERMANY Phone: +49-91 31 / 5 30 20 - 0 Fax: +49-91 31 / 5 30 20 - 20 info@opticom. de www. opticom. de North America: Telchemy Inc. Phone +1-770-614-6944 JDSU - Acterna U. S. [. . . ]