IEEE Trans Image Process - Automatic exact histogram specification for contrast enhancement and visual system based quantitative evaluation.

Tópicos

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Resumo

Histogram equalization, which aims at information maximization, is widely used in different ways to perform contrast enhancement in images. In this paper, an automatic exact histogram specification technique is proposed and used for global and local contrast enhancement of images. The desired histogram is obtained by first subjecting the image histogram to a modification process and then by maximizing a measure that represents increase in information and decrease in ambiguity. A new method of measuring image contrast based upon local band-limited approach and center-surround retinal receptive field model is also devised in this paper. This method works at multiple scales (frequency bands) and combines the contrast measures obtained at different scales using L(p)-norm. In comparison to a few existing methods, the effectiveness of the proposed automatic exact histogram specification technique in enhancing contrasts of images is demonstrated through qualitative analysis and the proposed image contrast measure based quantitative analysis.

Resumo Limpo

histogram equal aim inform maxim wide use differ way perform contrast enhanc imag paper automat exact histogram specif techniqu propos use global local contrast enhanc imag desir histogram obtain first subject imag histogram modif process maxim measur repres increas inform decreas ambigu new method measur imag contrast base upon local bandlimit approach centersurround retin recept field model also devis paper method work multipl scale frequenc band combin contrast measur obtain differ scale use lpnorm comparison exist method effect propos automat exact histogram specif techniqu enhanc contrast imag demonstr qualit analysi propos imag contrast measur base quantit analysi

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