A Detailed Review of Color Image Contrast Enhancement Techniques for Real Time Applications

Real-time video surveillance, medical imaging, industrial automation and oceanography applications use image enhancement as a preprocessing technique for the analysis of images. Contrast enhancement is one of a method to enhance low contrast images obtained under poor lighting and fog conditions. In this paper, various variants of histogram equalisation, Homomorphic filtering and dark channel prior techniques used for image enhancement are reviewed and presented. Real-time processing of images is implemented on Field Programmable Gate Array (FPGA) to increase the computing speed. Further this paper focus on the review of contrast enhancement techniques implemented on FPGA in terms of device utilization and processing time.

[1]  M. Grgic,et al.  Sub-Image Homomorphic Filtering Technique for Improving Facial Identification under Difficult Illumination Conditions , 2006 .

[2]  R. Khan,et al.  Realization of Balanced Contrast Limited Adaptive Histogram Equalization (B-CLAHE) for Adaptive Dynamic Range Compression of real time medical images , 2013, Proceedings of 2013 10th International Bhurban Conference on Applied Sciences & Technology (IBCAST).

[3]  Xiangkun Dong,et al.  Implementation of an Improved Real-time Image Contrast Enhancement Technique Based on FPGA , 2012 .

[4]  Donald G. Bailey,et al.  Design for Embedded Image Processing on FPGAs , 2011 .

[5]  Takao Onoye,et al.  Application of the real-time Retinex image enhancement for endoscopic images , 2013, 2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC).

[6]  Karel J. Zuiderveld,et al.  Contrast Limited Adaptive Histogram Equalization , 1994, Graphics Gems.

[7]  M. C. Hanumantharaju,et al.  Design of Novel Algorithm and Architecture for Gaussian Based Color Image Enhancement System for Real Time Applications , 2014, ArXiv.

[8]  Qian Chen,et al.  Image enhancement based on equal area dualistic sub-image histogram equalization method , 1999, IEEE Trans. Consumer Electron..

[9]  Yeong-Taeg Kim,et al.  Contrast enhancement using brightness preserving bi-histogram equalization , 1997 .

[10]  Mingui Sun,et al.  A multi-scale retinex implementation on FPGA for an outdoor application , 2011, 2011 4th International Congress on Image and Signal Processing.

[11]  M. C. Hanumantharaju,et al.  A Novel Reconfigurable Architecture for Enhancing Color Image Based on Adaptive Saturation Feedback , 2011 .

[12]  Tingting Zhang,et al.  Real-time enhancement of the image clarity for traffic video monitoring systems in haze , 2014, 2014 7th International Congress on Image and Signal Processing.

[13]  Takao Onoye,et al.  An fpga implementation of real-time retinex video image enhancement , 2010, 2010 World Automation Congress.