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Metrics to Estimate Image Quality in Compressed Video Sequences



G O'Brien, S Israel, J Irvine, Charles D. Fenimore, John W. Roberts, Michelle Brennan, D Cannon, J Miller


A fundamental problem in image processing is to find objective metrics that parallel human perception of image quality. In this study, several metrics were examined to quantify compression algorithms in terms of perceived loss in image quality. In addition, we sought to describe the relationship of image quality as a function of bit rate. The compression schemes used were JPEG2000, MPEG2, and H.264. The frame size was fixed at 848x480 and the encoding varied from 6000 k bps to 200 k bps. The metrics examined were peak signal to noise ratio (PSNR), structural similarity (SSIM), edge localization metrics, and a blur metric. To varying degrees the metrics displayed desirable properties, namely they were monotonic in the bit rate, the group of pictures (GOP) structure could be inferred, and they tended to agree with human perception of quality degradations. Additional work is being conducted to quantify the sensitivity of these measures with respect to our Motion Imagery Quality Scale.
Proceedings Title
Proceedings SPIE Security and Defense Symposium
Conference Dates
April 9-13, 2007
Conference Location
Orlando, FL, USA
Conference Title
SPIE Security and Defense Symposium


NIIRS, image quality, metrics, motion imagery, compression


O'Brien, G. , Israel, S. , Irvine, J. , Fenimore, C. , Roberts, J. , Brennan, M. , Cannon, D. and Miller, J. (2007), Metrics to Estimate Image Quality in Compressed Video Sequences, Proceedings SPIE Security and Defense Symposium, Orlando, FL, USA (Accessed April 19, 2024)
Created April 29, 2007, Updated October 12, 2021