ROUSSEAU et al.: STRUCTURAL SIMILARITY MEASURE TO ASSESS IMPROVEMENT BY NOISE 39 Fig. 4. (a) Gray-level input image . (b)–(f) gray-level image at the output of the sensor of (6) with saturation level a HXP, with the noise zero-mean Gaussian of rms amplitu<strong>de</strong> '. (b) ' aHmaximizing the cross-corre<strong>la</strong>tion g@Y A and minimizing the rms error i@Y A in Fig. 3. (c) ' aHXI. (d) ' aHXPV maximizing the SSIM in<strong>de</strong>x ƒ@Y A in Fig. 3. (e) ' aHXS. (f) ' aI. REFERENCES [1] Z. Wang and A. C. Bovik, “A universal image quality in<strong>de</strong>x,” IEEE Signal Process. Lett., vol. 9, pp. 81–84, 2002. [2] Z. Wang, A. C. Bovik, H. R. Sheikh, and E. P. Simoncelli, “Image quality assessment: From error visibility to structural simi<strong>la</strong>rity,” IEEE Trans. Image Process., vol. 13, pp. 600–612, 2004. [3] B. Andò and S. Graziani, “Adding noise to improve measurement,” IEEE Instrumen. Meas. Mag., vol. 4, no. 1, pp. 24–30, Mar. 2001. [4] G. P. 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