very satisfactory.
Though the KLT processing yields good results, it involves
considerable computational effort. On the other hand the KLT is an
optimal transform under a variety of criteria and guarantees minimum
MSE. Instead of the KLT, other suboptimal orthogonal transforns
which have fast algorithms [8,14] for easy implementation can be
used, Suboptimal transforms like the discrete cosine transform
(DCT) [19], the C-matrix transform [20] (which is a close integer
approximation to the DCT), the Walsh Hadamard transform can be used,
The DCT approximates very closely the KLT for a Markov-I process,
Such suboptimal transforms have been widely used in image
compression as a substitute for KLT to reduce the bit rate for
transmission or storage.
eference
1. W.A. Malila et al, "Characterization of LANDSAT-4 MSS and TM
digital image data", IEEE Trans. Geosc. and Remote Sens.,
vol.GE-22, pp.177-191, May 1984
2 J.C. Price, "Comparison of the information content of data from
the LANDSAT-4 Thematic Mapper and the Multispectral Scanner", IEEE
Trans, Geosc. and Remote Sens., vol.GE-22, pp.272-280, May 1984
3. Special Issue on LANDSAT-4, IEEE Trans. Geosc. and Remote
Sens., vol.GE-22, May 1984,
4, Special LIDQA issue, Photogrammetric Engg. & Remote Sensing,
vol.LI, Sept.1985
5. Bernstein et al, "Analysis and processing of LANDSAT-4 sensor
data using advanced image processing techniques and technologies",
IEEE Trans. Geosc. and Remote Sens., vol.GE-22, pp.192-221, May
1981.
6. L.: Fusco, U. Frei and A. Hsu, "Thematic Mapper:Operational
activities and sensor performance at ESA/Ethernet", Photogrammetric
Engg. & Remote Sensing, vol.LI, pp. 1299-1314, Sept.1985
7. H.C. Andrews, "Introduction to mathematical tecchniques in
pattern recognition”, Wiley-Interscience, New York, NY, 1972
8, D.F. i Elliott and ‘K.R. Rao, "Fast transforms: Algorithms,
Analyses and Applications", Academic Press, New York, NY, 1982.
9. A.K. Jain, "A sinusoidal family of unitary transforms", IEEE
Trans, Pattern Analysis and Machine Intell., vol.PAMI-2,
10. K.R. Rao, ed.,"Discrete transforms and their applications",
Van Nostrand Reinhold Company, New York, NY, 1985
268