Al-Zuky, A. A. D., S. S.S. Zuheri, and K. J. Al- Shujare. 2017. “Calculating Techniques for The Contrast of Images Which Have Different Illuminations”. Ibn AL-Haitham Journal For Pure and Applied Sciences 22 (4). https://jih.uobaghdad.edu.iq/index.php/j/article/view/1157.