ITU-T J.341 PDF

This Recommendation¹ provides a perceptual video quality measurement method for use in high definition television (HDTV) non-interactive applications when the full reference (FR) measurement method can be used. The model VQuad-HD was developed to estimate subjective quality scores obtained using [b-ITU-T P.910].

The full reference measurement method can be used when the unimpaired reference video signal is readily available at the measurement point, as may be the case of measurements on individual equipment or a chain in the laboratory or in a closed environment such as a cable television head end. The estimation method includes both calibration and objective video quality estimations

The validation test material contained both [b-ITU-T H.264] and MPEG-2 coding degradations and various transmission error conditions (e.g., bit errors, dropped packets). The model proposed in this Recommendation may be used to monitor the quality of deployed networks to ensure their operational readiness. The visual effects of the degradations may include spatial as well as temporal degradations. The model in this Recommendation can also be used for lab testing of video systems. When used to compare different video systems, it is advisable to use a quantitative method (such as that in [b-ITU-T J.149]) to determine the model's accuracy for that particular context

Note that 720p was considered in the validation test plan as part of the test condition hypothetical reference circuit (HRC). As 720p is currently commonly up-scaled as part of the display, it was felt that 720p HRCs would more appropriately address this format

¹ This Recommendation includes an electronic attachment containing several short high definition (HD) video sequences, their corresponding predicted mean opinion scores (MOS), and the predicted MOS for five HD databases available via VQEG.