[1] CHEN Qi，XIONG Bo-li，LU Jun，et al. Improved Two-Dimensional Otsu Image Segmentation Method and Fast Recursive Realization [J]. Journal of Electronics & Information Technology，2010，32(5)：1100-1104.
[2] XU Xiang-yang，SONG En-min，JIN Liang-hai. Characteristic Analysis of Threshold Based on Otsu Criterion [J]. Acta Electronics Sinica，2009，37(12)：2716-2719.
[4] LING Guang-ming，LIU Dong-hua，LI Bo，et al. Improvement of Two-Dimension Adaptive Thresholding Segmentation Algorithm for Microscopic Cellular Images [J]. Journal of Image and Graphics，2003，8(7)：764-768.
[5] LUESSI M，ECHMANN M，KATSAGGELOS A. Framework for Efficient Optimal Multilevel Image Thresholding [J]. Journal of Electronic Imaging(S1017-9909)，2009，18(1)：013400-1-013400-10.
[6] HUANG D，WANG C. Optimal Multi-Level Thresholding Using a Two-Stage Otsu Optimization Approach [J]. Pattern Recognition Letters (S0167-8655)，2009，30：275-284.
[7] LIU Jian-zhuang，LI Wen-qing. Automatic Thresholding of Gray-Level Pictures Using Two-Dimensional Otsu Method [J].Acta Automatic Sinica，1993，19(1)：101-105.
[8] WANG Hai-yang，PAN De-lu，XIA De-shen. A Fast Algorithm for Two-Dimensional Otsu Adaptive Threshold Algorithm [J].Acta Automatic Sinica，2007，33(9)：968-970.
[9] WU Yi-quan，ZHANG Jin-kuang. Thresholding Based on Maximum Entropic Correlation of Average Gray Level-Gradient Two-Dimensional Histogram [J]. Journal of Chinese Computer Systems，2009，30(8)：1675-1679.
[10] JAIN A K. Fundamentals of Digital Image Processing [M]. Prentice Hall，1989：51.
[11] CHEN J，SHANG S G，HE C，et al. WLD：A Robust Local Image Descriptor [J]. IEEE Transactions on Pattern Analysis and Machine Intelligence(S0162-8828)，2010，32(9)：1705–1720.
