Subjective quality evaluation of low-bit-rate video

Mark Masry; Sheila S. Hemami; Wilfried M. Osberger; Ann Marie Rohaly

doi:10.1117/12.429539

8 June 2001 Subjective quality evaluation of low-bit-rate video

Mark Masry, Sheila S. Hemami, Wilfried M. Osberger, Ann Marie Rohaly

Proceedings Volume 4299, Human Vision and Electronic Imaging VI; (2001) https://doi.org/10.1117/12.429539
Event: Photonics West 2001 - Electronic Imaging, 2001, San Jose, CA, United States

Abstract

A subjective quality evaluation was performed to qualify vie4wre responses to visual defects that appear in low bit rate video at full and reduced frame rates. The stimuli were eight sequences compressed by three motion compensated encoders - Sorenson Video, H.263+ and a Wavelet based coder - operating at five bit/frame rate combinations. The stimulus sequences exhibited obvious coding artifacts whose nature differed across the three coders. The subjective evaluation was performed using the Single Stimulus Continuos Quality Evaluation method of UTI-R Rec. BT.500-8. Viewers watched concatenated coded test sequences and continuously registered the perceived quality using a slider device. Data form 19 viewers was colleted. An analysis of their responses to the presence of various artifacts across the range of possible coding conditions and content is presented. The effects of blockiness and blurriness on perceived quality are examined. The effects of changes in frame rate on perceived quality are found to be related to the nature of the motion in the sequence.

Citation Download Citation

Mark Masry, Sheila S. Hemami, Wilfried M. Osberger, and Ann Marie Rohaly "Subjective quality evaluation of low-bit-rate video", Proc. SPIE 4299, Human Vision and Electronic Imaging VI, (8 June 2001); https://doi.org/10.1117/12.429539

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