IEEE Trans Image Process - Naturalness preserved enhancement algorithm for non-uniform illumination images.

Tópicos

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Resumo

Image enhancement plays an important role in image processing and analysis. Among various enhancement algorithms, Retinex-based algorithms can efficiently enhance details and have been widely adopted. Since Retinex-based algorithms regard illumination removal as a default preference and fail to limit the range of reflectance, the naturalness of non-uniform illumination images cannot be effectively preserved. However, naturalness is essential for image enhancement to achieve pleasing perceptual quality. In order to preserve naturalness while enhancing details, we propose an enhancement algorithm for non-uniform illumination images. In general, this paper makes the following three major contributions. First, a lightness-order-error measure is proposed to access naturalness preservation objectively. Second, a bright-pass filter is proposed to decompose an image into reflectance and illumination, which, respectively, determine the details and the naturalness of the image. Third, we propose a bi-log transformation, which is utilized to map the illumination to make a balance between details and naturalness. Experimental results demonstrate that the proposed algorithm can not only enhance the details but also preserve the naturalness for non-uniform illumination images.

Resumo Limpo

imag enhanc play import role imag process analysi among various enhanc algorithm retinexbas algorithm can effici enhanc detail wide adopt sinc retinexbas algorithm regard illumin remov default prefer fail limit rang reflect natur nonuniform illumin imag effect preserv howev natur essenti imag enhanc achiev pleas perceptu qualiti order preserv natur enhanc detail propos enhanc algorithm nonuniform illumin imag general paper make follow three major contribut first lightnessordererror measur propos access natur preserv object second brightpass filter propos decompos imag reflect illumin respect determin detail natur imag third propos bilog transform util map illumin make balanc detail natur experiment result demonstr propos algorithm can enhanc detail also preserv natur nonuniform illumin imag

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