IEEE Trans Image Process - Directional filtering transform for image/intra-frame compression.

Tópicos

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Resumo

While directional adaption is introduced into traditional transforms, different orders of two 1-D transforms will result in different results of one 2-D transform. Based upon an anisotropic image model, this paper analyzes the effect of transform orders in terms of theoretical coding gain. Our results reveal that the transform orders have little effect on the coding gain with full decomposition, good directional modes and good interpolation. However, in practical compression schemes, since high-pass bands are not decomposed fully because of the consideration on complexity, different transform orders have different coding performances, which can be solved by an adaptive transform order. Motivated by our analyzed results, a directional filtering transform (dFT, in order to distinguish from the common usage on DFT) is proposed in this paper to better exploit correlations among samples in H.264 intraframe coding. It provides an evenly distributed set of prediction modes with an adaptive transform order. Both interblock and intrablock correlations are exploited in this scheme. Experimental results in H.264 intraframe coding demonstrate its superiority both objectively and subjectively.

Resumo Limpo

direct adapt introduc tradit transform differ order two d transform will result differ result one d transform base upon anisotrop imag model paper analyz effect transform order term theoret code gain result reveal transform order littl effect code gain full decomposit good direct mode good interpol howev practic compress scheme sinc highpass band decompos fulli consider complex differ transform order differ code perform can solv adapt transform order motiv analyz result direct filter transform dft order distinguish common usag dft propos paper better exploit correl among sampl h intrafram code provid even distribut set predict mode adapt transform order interblock intrablock correl exploit scheme experiment result h intrafram code demonstr superior object subject

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