1.文本检测批量分块传入tesseract识别
2.翻译后映射到原票据字体问题
3.图片去噪（难点），参考方案：
[https://dsp.stackexchange.com/questions/33540/binarization-of-image-for-varying-background-and-foreground-colors-for-ocr](https://dsp.stackexchange.com/questions/33540/binarization-of-image-for-varying-background-and-foreground-colors-for-ocr]
http://mile.ee.iisc.ernet.in/mile/publications/softCopy/DocumentAnalysis/CBDAR_Kasar_2007.pdf
https://arxiv.org/pdf/1506.04395.pdf
4.GNU并行，参考方案：
https://github.com/tesseract-ocr/tesseract/wiki/FAQ-Old#how-do-i-uninstall-tesseract
http://www.gnu.org/software/parallel/
5.流程解析
Useful parameters
https://github.com/tesseract-ocr/tesseract/wiki/ControlParams
https://github.com/tesseract-ocr/tesseract/wiki/FAQ-Old#error-message-font-id---10-class-id--1105-on-sample-0
训练基本参数配置
https://github.com/tesseract-ocr/tesseract/blob/master/doc/tesseract.1.asc#config-files-and-augmenting-with-user-data
训练模型说明4.0
https://github.com/tesseract-ocr/tesseract/wiki/TrainingTesseract-4.00
Data Files
https://github.com/tesseract-ocr/tesseract/wiki/Data-Files
tesseract常见问题论坛
https://github.com/tesseract-ocr/tesseract/issues
parameters config(./configs)
http://www.sk-spell.sk.cx/tesseract-ocr-parameters-in-302-version
https://pastebin.com/av7huwQP
Tesseract 4.00中新的神经网络系统概述
https://github.com/tesseract-ocr/tesseract/wiki/NeuralNetsInTesseract4.00
Noise characters recognized with bbox as the entire page（去噪框到了一张图片）
https://github.com/tesseract-ocr/tesseract/issues/1192
tesseract for python
pyocr
https://gitlab.gnome.org/World/OpenPaperwork/pyocr
https://github.com/tesseract-ocr/tesseract/wiki/FAQ-Old#how-do-i-uninstall-tesseract
并行处理多个图像
parallel "tesseract {} {} -l eng hocr; hocr2pdf -i {} -n -o {}.pdf < {}.html" ::: *.tif
线程线程
OMP_THREAD_LIMIT
https://groups.google.com/forum/#!forum/tesseract-ocr
https://groups.google.com/forum/#!topic/tesseract-ocr/pL6GELDd9Yg
How can define character size for tesseract?
config='--psm 8'
https://groups.google.com/forum/#!topic/tesseract-ocr/MbFSNPtXt84
Really poor performance with decimal numbers
try --psm 6
https://groups.google.com/forum/#!searchin/tesseract-ocr/l.bolzani%7Csort:date/tesseract-ocr/be4-rjvY2tQ/32evtMHlAQAJ
微调模型
https://groups.google.com/forum/#!topic/tesseract-ocr/Fkv2omJWxNw
-l eng --psm 8 --textord_min_linesize 2.5 hocr 1>/null 2>&1
几何图像变换（包含许多图像缩放算法）
https://docs.opencv.org/2.4/modules/imgproc/doc/geometric_transformations.html#resize
Harris Corner Detection(找到物体顶点)
https://docs.opencv.org/3.0-beta/doc/py_tutorials/py_feature2d/py_features_harris/py_features_harris.html
Camera Calibration
https://opencv-python-tutroals.readthedocs.io/en/latest/py_tutorials/py_calib3d/py_calibration/py_calibration.html
Interactive Foreground Extraction using GrabCut Algorithm
https://opencv-python-tutroals.readthedocs.io/en/latest/py_tutorials/py_imgproc/py_grabcut/py_grabcut.html#grabcut
图像金字塔
https://docs.opencv.org/3.1.0/dc/dff/tutorial_py_pyramids.html
可结合pyimagesearch了解
https://www.pyimagesearch.com/2015/11/02/watershed-opencv/
Image Denoising
https://docs.opencv.org/3.3.1/d5/d69/tutorial_py_non_local_means.html
使用数据预处理不做处理的对比
https://www.pyimagesearch.com/2017/07/10/using-tesseract-ocr-python/
4 Point OpenCV getPerspective Transform Example（图片旋转）
https://www.pyimagesearch.com/2014/08/25/4-point-opencv-getperspective-transform-example/
imutils包(pip install imutils)作者自己封装了一些图像平移、旋转、调整等，OpenCV也可实现，但比OpenCV结构稍简单
https://www.pyimagesearch.com/2015/02/02/just-open-sourced-personal-imutils-package-series-opencv-convenience-functions/
提取获取票据的边框和提取票据（仅票据与背景颜色有明显区别）
How to Build a Kick-Ass Mobile Document Scanner in Just 5 Minutes
https://www.pyimagesearch.com/2014/09/01/build-kick-ass-mobile-document-scanner-just-5-minutes/
字体倾斜矫正
Text skew correction with OpenCV and Python
https://www.pyimagesearch.com/2017/02/20/text-skew-correction-opencv-python/
Extract object from background with OpenCv and Python（前景物体提取）
http://faqpython.com/extract-object-from-background-with-opencv-and-python/
基于OpenCV识别游戏机的口袋怪物（共6step）
Building a Pokedex in Python: Finding the Game Boy Screen(find screen)
https://www.pyimagesearch.com/2014/03/10/building-pokedex-python-getting-started-step-1-6/
https://www.pyimagesearch.com/2014/03/24/building-pokedex-python-scraping-pokemon-sprites-step-2-6/
https://www.pyimagesearch.com/2014/04/07/building-pokedex-python-indexing-sprites-using-shape-descriptors-step-3-6/
https://www.pyimagesearch.com/2014/04/21/building-pokedex-python-finding-game-boy-screen-step-4-6/
https://www.pyimagesearch.com/2014/05/05/building-pokedex-python-opencv-perspective-warping-step-5-6/
https://www.pyimagesearch.com/2014/05/19/building-pokedex-python-comparing-shape-descriptors-opencv/
标准多边形检测
https://www.pyimagesearch.com/2016/02/08/opencv-shape-detection/
https://www.pyimagesearch.com/2014/10/20/finding-shapes-images-using-python-opencv/
图片旋转，可根据旋转图片大小改变旋转后图片大小
https://www.pyimagesearch.com/2017/01/02/rotate-images-correctly-with-opencv-and-python/
信用卡下的数字识别
Credit card OCR with OpenCV and Python
https://www.pyimagesearch.com/2017/07/17/credit-card-ocr-with-opencv-and-python/
Detecting Barcodes in Images with Python and OpenCV
https://www.pyimagesearch.com/2014/11/24/detecting-barcodes-images-python-opencv/
Sorting Contours using Python and OpenCV
https://www.pyimagesearch.com/2015/04/20/sorting-contours-using-python-and-opencv/
背景与前景提取
Extract object from background with OpenCv and Python
http://faqpython.com/extract-object-from-background-with-opencv-and-python/
使用图像纹理对图像做加工，然后进行分类
Local Binary Patterns with Python & OpenCV
https://www.pyimagesearch.com/2015/12/07/local-binary-patterns-with-python-opencv/
流域分割硬币（分水岭算法）
https://www.pyimagesearch.com/2015/11/02/watershed-opencv/
OpenCV+深度学习学习资料
https://www.pyimagesearch.com/static/cv_dl_resource_guide.pdf
https://www.pyimagesearch.com/pyimagesearch-gurus/