4. Imaging Techniques in Document Analysis Processes(文档分析过程中的图像技术)
Contents
Introduction. ....................................................................................... 74
Basic Image Processing Algorithms. ............................................................. 74
Morphological Operations. ................................................................... 75
Skeletonization. ............................................................................... 75
Connected Component Labeling.............................................................. 76
Run-Length Smoothing Algorithm (RLSA). ................................................ 76
Distance Transform. ........................................................................... 76
Hough Transform ............................................................................. 77
Projection Profiles. ............................................................................ 77
Document Image Binarization. ................................................................... 77
Global Thresholding Techniques. ............................................................ 79
Local Thresholding Techniques. ............................................................. 86
Hybrid Thresholding Techniques. ............................................................ 90
Combining Different Binarization Techniques. .............................................. 91
Using Training Samples....................................................................... 92
Binarization of Color Documents. ............................................................ 94
Document Image Enhancement. .................................................................. 95
Low Contrast and Uneven Background Illumination........................................ 95
Bleed-Through, Shining, or Shadow-Through Effects. .......... ........... ............ .... 97
Damaged Characters or Noisy Background. ................................................. 101
Borders or Parts of Adjacent Page. ........................................................... 102
Document Image Normalization.................................................................. 104
Page Orientation............................................................................... 104
Deskew and Deslant. .......................................................................... 112
Dewarping. .................................................................................... 123
Conclusion. ........................................................................................ 127
Cross-References. ................................................................................. 127
References. ........................................................................................ 128
Further Reading. .............................................................................. 131
原文地址：https://www.cnblogs.com/2008nmj/p/12216453.html