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Título

Nonlinear image representation for efficient perceptual coding

AutorMalo, J.; Epifanio, I.; Navarro, Rafael; Simoncelli, E. P.
Fecha de publicación2006
EditorInstitute of Electrical and Electronics Engineers
CitaciónIEEE transactions on image processing 15(1): 68-80 (2006)
ResumenImage compression systems commonly operate by transforming the input signal into a new representation whose elements are independently quantized. The success of such a system depends on two properties of the representation. First, the coding rate is minimized only if the elements of the representation are statistically independent. Second, the perceived coding distortion is minimized only if the errors in a reconstructed image arising from quantization of the different elements of the representation are perceptually independent. We argue that linear transforms cannot achieve either of these goals and propose, instead, an adaptive nonlinear image representation in which each coefficient of a linear transform is divided by a weighted sum of coefficient amplitudes in a generalized neighborhood. We then show that the divisive operation greatly reduces both the statistical and the perceptual redundancy amongst representation elements. We develop an efficient method of inverting this transformation, and we demonstrate through simulations that the dual reduction in dependency can greatly improve the visual quality of compressed images.
Versión del editorhttp://dx.doi.org/10.1109/TIP.2005.860325
URIhttp://hdl.handle.net/10261/19176
DOI10.1109/TIP.2005.860325
ISSN1057-7149
Aparece en las colecciones: (ICMA) Artículos
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