By Shen-en Qian
This booklet offers an international evaluation of optical satellite tv for pc photograph and information compression theories, algorithms, and approach implementations. along with 9 chapters, it describes various lossless and near-lossless data-compression options and 3 foreign satellite-data-compression criteria. the writer stocks his firsthand adventure and learn ends up in constructing novel satellite-data-compression suggestions for either onboard and on-ground use, consumer exams of the effect that information compression has on satellite tv for pc info purposes, development compression structures, and optimizing and deploying structures. Written with either postgraduate scholars and complicated pros in brain, this instruction manual addresses very important problems with satellite tv for pc info compression and implementation, and it offers an end-to-end therapy of information compression know-how.
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Huot, “Overview of the Envisat MERIS and AATSR data quality, calibration and validation program,” Proc. IGARSS 2003 3, 1588–1590 (2003). 7. , “Evaluation of onboard data compression vs band-averaging of MERIS hyperspectral data on information volume,” unpublished internal technical report, Canadian Space Agency (2002). 8. 002940). 9. Wang, Z. and A. C. Bovik, “A universal image quality index,” IEEE Signal Process. Lett. 9(3), 81–84 (2002). 10. , A. C. Bovik, and L. ” Proc. IEEE Int. Conf. , Speech, Signal Process.
With the additional cost of sending one more parameter dðpm jjpÞ, Eq. 66) not only gives a more-accurate estimator of dðpjjqÞ but also provides the useful feature that when there is no distortion between the original and received images [which implies p(x) ¼ q(x) for all x], both the distortion measure dðpjjqÞ and the estimated distortion measure d^ðpjjqÞ are exactly zero. The RR metric between a distorted test image and the reference image is defined as " # K 1 X k k D ¼ log2 1 þ jd^k ðp jjq Þj , ð1:69Þ D0 k 1 where K is the number of wavelet coefficient subbands, pk and qk are the probability density functions of the kth subbands in the reference image and test image, respectively, d^k is the estimation of the Kullback–Leibler distance between pk and qk, and D0 is a constant used to control the scale of the distortion measure.
2 Flowchart for calculating NR metric S score. fusion to yield a measurement of spatial distortion. The rationale is that such Q index values should be unchanged after fusion, that is, when the spectral information is translated from the coarse scale of the multispectral data to the fine scale of the pan image. 1 Spectral distortion index A spectral distortion index is derived from the difference of interband Q index values calculated from the fused multispectral band images, indicated as fM ^ lg l ¼ 1, 2, .
