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Contrast enhancement by modified octagon histogram equalization

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Abstract

Histogram equalization is the common method used for contrast enhancement. The mean brightness of the image is adjusted to middle of the permitted range and hence is not suitable for consumer electronics products. A novel contrast enhancement method using modified octagon histogram equalization is developed to overcome the drawback of conventional technique for gray scale images. The proposed algorithm is applied for boat image, microstructure of steel and human head. The contrast enhanced out of the images mentioned is obtained, and the efficiency of the algorithm is evaluated. Simulation results shows that the proposed method can enhance the different types of images effectively. Besides, the proposed contrast enhancement method using modified octagon histogram equalization has comparable performance with black and white stretching and adaptive histogram equalization.

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Abbreviations

\(\hbar \) :

Adjusted histogram

\(\hbox {j}_{\mathrm{b}}\) and \(\hbox {j}_{\mathrm{w}}\) :

Black and white stretching factors

CEOHE:

Contrast enhancement by modified octagon histogram equalization

\(\updelta \) :

Del—weighting parameter

D:

Difference matrix

GCE:

Global contrast enhancement

h(s):

Histogram

HE:

Histogram equalization

\(\hbox {h}_{\mathrm{k}}\) :

Input histogram

N:

Intensity

LCE:

Local contrast enhancement

E(s):

Mapping function

D:

Number of bits

PDF:

Probability density function

B:

Tri-diagonal matrix

f:

Uniform histogram

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Acknowledgments

The corresponding author would like to thank Mr. Sunil Sisodia D.G.M., (Quality) Steel Authority of India Limited, Salem, Tamil Nadu, India, for providing metallographic images for implementation of this proposed algorithm.

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Authors and Affiliations

  1. Electronics and Communication Engineering, K. S. Rangasamy College of Technology, Namakkal, Tamilnadu, India

    K. Santhi

  2. Government College of Engineering, Salem, Tamilnadu, India

    R. S. D. Wahida Banu

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  1. K. Santhi
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  2. R. S. D. Wahida Banu
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Correspondence to K. Santhi.

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Santhi, K., Wahida Banu, R.S.D. Contrast enhancement by modified octagon histogram equalization. SIViP 9 (Suppl 1), 73–87 (2015). https://doi.org/10.1007/s11760-014-0643-6

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  • DOI: https://doi.org/10.1007/s11760-014-0643-6

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