Summary

Recommendation ITU-T J.244 specifies full reference (FR) and reduced reference (RR) calibration methods which report alignment shifts in both space and time of processed (e.g., compressed, transmitted, and decompressed) video sequences with respect to corresponding source video sequences. The methods also compute gain and offset of processed video sequences. The methods require that spatial and temporal shifts must be constant. Furthermore, the gain and offset must be constant. The methods in this Recommendation are applicable to:

•            reporting shifts that can be used to register source and processed video sequences in space and time;

•            reporting gains, and offsets of video levels that can be used to calibrate processed video sequences with respect to the source.

Intended applications for these methods include, but are not limited to, assessing the operational readiness of video transmission systems that contain compression/transmission/decompression components, obtaining calibration estimates for correcting processed video sequences before measuring subjective or objective picture quality, and verifying that video transmission systems meet specified calibration requirements.