doc

***laplacian/canny***
http://www.idlcoyote.com/ip_tips/sharpen.html
http://homepages.inf.ed.ac.uk/rbf/HIPR2/log.htm

http://blog.csdn.net/likezhaobin/article/details/6892176


***msr***
http://cn.mathworks.com/help/vision/examples/automatically-detect-and-recognize-text-in-natural-images.html
http://download.csdn.net/download/lizhbayexx/7863941

***stroke***
http://www.cnblogs.com/easymind223/archive/2013/02/14/2911170.html

***binarization***
http://graphics.cs.msu.ru/en/research/projects/msr/text

***tesseract***
http://blog.csdn.net/kaelsass/article/details/46874627

******
http://data.qq.com/article?id=2552#body

********
http://wenku.baidu.com/view/1d2ec3c34028915f804dc213.html
http://blog.timmlinder.com/2011/07/opencv-equivalent-to-matlabs-conv2-function/
http://stackoverflow.com/questions/11456565/opencv-mean-sd-filter

https://studytech.wordpress.com/2012/05/10/imfilter/
http://www.zhihu.com/question/24591127
http://blog.csdn.net/chenyusiyuan/article/details/8710462/

http://llcao.net/cu-deeplearning15/pdf/8OCR.pdf

投影分割法

******局部特征***********
http://www.juergenwiki.de/work/wiki/doku.php?id=public:hog_descriptor_computation_and_visualization