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Color retinal image enhancement using luminosity and quantile based contrast enhancement

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Abstract

Retinal imaging is used to diagnose common eye diseases. But retinal images that suffer from image blurring, uneven illumination and low contrast become useless for further diagnosis by automated systems. In this work, we have proposed a new method for overall contrast enhancement of the color retinal images. Initially, a gain matrix of luminance values which is obtained by adaptive gamma correction method is used to enhance all three color channels of the images. After that quantile-based histogram equalization is used to enhance overall visibility of the images. Enhancement results of the proposed method are compared with several other existing methods. Performance of the proposed method is evaluated on all images of publicly available Messidor database. Based on the assessment measure we have shown that the proposed method is able to enhance the contrast of given color retinal image without changing its structural information. The proposed technique is appeared to accomplish superior image enhancement with sufficient contrast enhancement, these enhancement results are better than other related techniques. This technique for color retinal image enhancement might be utilized to help ophthalmologists in the more productive screening of retinal ailments, what’s more, being developed of enhanced robotized image examination for clinical finding.

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Acknowledgements

Authors thank (Decenciere 2014) for providing free access of Messidor database.

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Authors and Affiliations

  1. PDPM Indian Institute of Information Technology, Design and Manufacturing Jabalpur, Jabalpur, MP, 482005, India

    Bhupendra Gupta & Mayank Tiwari

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  1. Bhupendra Gupta
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  2. Mayank Tiwari
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Correspondence to Bhupendra Gupta.

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Gupta, B., Tiwari, M. Color retinal image enhancement using luminosity and quantile based contrast enhancement. Multidim Syst Sign Process 30, 1829–1837 (2019). https://doi.org/10.1007/s11045-019-00630-1

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  • DOI: https://doi.org/10.1007/s11045-019-00630-1

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