S. Yang, C. Wang and L. G. Deng, “A New Approach of Image Enhancement Based on Multi-Scale Morphological Reconstruction,” 9th International Conference on Hybrid Intelligent Systems, Shenyang, 12-14 August 2009, pp. 113-116. doi:10.1109/HIS.2009.30
 S. G. Mallat, “A Theory for Multiresolution Signal Decomposition: The Wavelet Representation,” IEEE Transactions on Pattern Analysis and Machine Intelligence, Vol. 2, No. 7, 1989, pp. 674-693. doi:10.1109/34.192463
 S. M. Pizer and E. P. Ambtrrn, “Adaptive Histogram Equalization and Its Variations,” Computer Vision Gra- phics & Image Processing, Vol. 39, No. 3, 1987, pp. 355-368. doi:10.1016/S0734-189X(87)80186-X
 J. S. Tang, X. M. Liu and Q, L. Sun, “A Direct Image Contrast Enhancement Algorithm in the Wavelet Domain for Screening Mammograms,” IEEE Journal of Selected Topics in Signal Processing, Vol. 3, No. 1, 2009, p. 1.
 J. S. Tang, Q. L. Sun and K. Agyepong, “An Image Enhancement Algorithm Based on a Contrast Measure in the Wavelet Domain for Screening Mammograms,” IEEE International Conference on Image Processing, San Antonio, 16-19 September 2007, pp. 74-80. doi:10.1109/ICIP.2007.4379757