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Optical Engineering

No-reference peak signal to noise ratio estimation based on generalized Gaussian modeling of transform coefficient distributions
Author(s): Ji-Woo Ryu; Seon-Oh Lee; Dong-Gyu Sim; Jong-Ki Han
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Paper Abstract

We present a no-reference peak signal to noise ratio (PSNR) estimation algorithm based on discrete cosine transform (DCT) coefficient distributions from H.264/MPEG-4 part 10 advanced video codec (H.264/AVC) bitstreams. To estimate the PSNR of a compressed picture without the original picture on the decoder side, it is important to model the distribution of transform coefficients obtained from quantized coefficients accurately. Whereas several conventional algorithms use the Laplacian or Cauchy distribution to model the DCT coefficient distribution, the proposed algorithm uses a generalized Gaussian distribution. Pearson's χ2 (chi-square) test was applied to show that the generalized Gaussian distribution is more appropriate than the other models for modeling the transform coefficients. The χ2 test was also used to find optimum parameters for the generalized Gaussian model. It was found that the generalized Gaussian model improves the accuracy of the DCT coefficient distribution, thus reducing the mean squared error between the real and the estimated PSNR.

Paper Details

Date Published: 29 February 2012
PDF: 12 pages
Opt. Eng. 51(2) 027401 doi: 10.1117/1.OE.51.2.027401
Published in: Optical Engineering Volume 51, Issue 2
Show Author Affiliations
Ji-Woo Ryu, Kwangwoon Univ. (Korea, Republic of)
Seon-Oh Lee, Kwangwoon Univ. (Korea, Republic of)
Dong-Gyu Sim, Kwangwoon Univ. (Korea, Republic of)
Jong-Ki Han, Sejong Univ. (Korea, Republic of)

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