Another adaptive gamma correction implementation

Still a bit unhappy with the results of automatic (adaptive) gamma correction I’m continuing to experiment by writing the implementation of papers in regard to this topic. This time I found a paper with promising results and the title » An adaptive gamma correction for image enhancement « [1].

Contents

1. Transformation results
2. Implementation
3. Opinion
4. References

In the following I do refer to the implemented transformation as AGCIE.

Transformation results

All photos (these are photos I’ve taken) have been scaled and cropped to 1600x1200px and converted to PNG.

original	agcwd [3]	iagcwd [2]	agcie [1]
original	agcwd [3]	iagcwd [2]	agcie [1]
original	agcwd [3]	iagcwd [2]	agcie [1]
original	agcwd [3]	iagcwd [2]	agcie [1]
original	agcwd [3]	iagcwd [2]	agcie [1]
original	agcwd [3]	iagcwd [2]	agcie [1]
original	agcwd [3]	iagcwd [2]	agcie [1]
original	agcwd [3]	iagcwd [2]	agcie [1]
original	agcwd [3]	iagcwd [2]	agcie [1]
original	agcwd [3]	iagcwd [2]	agcie [1]
original	agcwd [3]	iagcwd [2]	agcie [1]
original	agcwd [3]	iagcwd [2]	agcie [1]

Implementation

The implementation is available under MIT license written in PHP using \Imagick at Github

Opinion

It’s not as bright as AGCWD and – if you ignore the first three pictures (which have been classified as low contrast bright) on which this method massively failed – still brighter than my previous implementation (IAGCWD). Again, I prefer the results of the AGCWD.

References

Please mind that AGCIE, AGCWD, IAGCWD are not official abbreviations – it’s just what I used in my blog articles and in the implementation code.

1. AGCIE:
   Rahman, Shanto & Rahman, Md. Mostafijur & Abdullah-Al-Wadud, M & Al-Quaderi, Golam Dastegir & Shoyaib, Mohammad. (2016). An adaptive gamma correction for image enhancement. EURASIP Journal on Image and Video Processing. 35. 10.1186/s13640-016-0138-1.
2. IAGCWD:
   Cao, Gang & Huang, Lihui & Tian, Huawei & Huang, Xianglin & Wang, Yongbin & Zhi, Ruicong. (2017). Contrast Enhancement of Brightness-Distorted Images by Improved Adaptive Gamma Correction. CAEE. 10.1016/j.compeleceng.2017.09.012.
3. AGCWD:
   S. Huang, F. Cheng and Y. Chiu, „Efficient Contrast Enhancement Using Adaptive Gamma Correction With Weighting Distribution,“ in IEEE Transactions on Image Processing, vol. 22, no. 3, pp. 1032-1041, March 2013. doi: 10.1109/TIP.2012.2226047