tesseract | 易学教程

Tesseract running error

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问题 I have a problem with running tesseract-ocr engine on linux. I've downloaded RUS language data and put it to tessdata directory (/usr/local/share/tessdata). When I'm trying to run tesseract with command tesseract blob.jpg out -l rus , it displays an error: Error opening data file /usr/local/share/tessdata/eng.traineddata Please make sure the TESSDATA_PREFIX environment variable is set to the parent directory of your "tessdata" directory. Failed loading language eng Tesseract couldn't load any

OCR技术（光学字符识别）

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什么是OCR？ OCR英文全称是optical character recognition，中文叫光学字符识别。它是利用光学技术和计算机技术把印在或者写在纸上的文字读取出来，并转换成一种计算机能够接受、人又可以理解的格式。文字识别是计算机视觉研究领域的分支之一，而且这个课题已经是比较成熟了，并且在商业中已经有很多落地项目了。比如汉王OCR，百度OCR，阿里OCR等等，很多企业都有能力都是拿OCR技术开始挣钱了。其实我们自己也能感受到，OCR技术确实也在改变着我们的生活：比如一个手机APP 就能帮忙扫描名片、身份证，并识别出里面的信息；汽车进入停车场、收费站都不要人工登记了，都是用车牌识别技术；我们看书时看到不懂的题，那个手机一扫，APP就能在网上帮你找到这题的答案。太多太多的应用了，OCR的应用在当今时代确实是百花齐放。 OCR的分类如果要给OCR进行分类，我觉得可以分为两类：手写识别和印刷体识别。这两个可以认为是OCR领域两个大主题了，当然印刷识别较手写体识别要简单得多，我们也能从直观上理解印刷体大多都是规则的字体，因为这些字体都是计算机自己生成再通过打印技术印刷到纸上。在印刷体的识别上有其独特的干扰；在印刷过程中字体很可能变得断裂或者墨水粘连，使得OCR识别异常困难。当然这些都可以通过一些图像处理的技术帮他尽可能的还原，进而提高识别率。总的来说

How to ignore special characters in Tesseract OCR using java

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问题 I have extracted text from image through Tesseract OCR using java. But the output is consisting of some special characters because image contains some symbols. I want to ignore all the special characters and display just text. Is there any way that i can do that? 回答1: In tesseract you can set TessBaseAPI.VAR_CHAR_WHITELIST and TessBaseAPI.VAR_CHAR_BLACKLIST in order to ignore some special characters. Following would make tesseract only recognize A-Z and digits String whiteList =

How to ignore special characters in Tesseract OCR using java

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tesseract-ocr 图片文字识别

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本篇记录下python识别图片中的文字所需的安装配置；安装库： pip install pytesseract pip install PILLOW 安装 Tesseract-OCR软件： Tesseract-OCR 这个软件是由Google维护的开源的OCR软件。下载地址：https://github.com/tesseract-ocr/tesseract/wiki/Downloads 下载后安装后，将Tesseract-OCR路径加入系统path；安装时注意勾选简体中文，默认安装，安装完毕后，敲命令（看看装的怎么样了，支持什么语言）： tesseract tesseract -v tesseract --list-langs　　#查看Tesseract-OCR支持语言中文字库 chi_sim.traineddata 下载地址：https://github.com/tesseract-ocr/tesseract/wiki/Data-Files 将中文字库放在\Tesseract-OCR\tessdata文件夹里面；改文件： C:\Python3\Lib\site-packages\pytesseract\pytesseract.py（根据实际路径修改），找到这两行： # CHANGE THIS IF TESSERACT IS NOT IN YOUR PATH, OR

Tesseract OCR “VCRUNTIME140.dll is missing from your computer” but sample solution works?

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问题 I installed the Tesseract NuGet Package in my Visual Studio 2013 solution and during runtime when I initialise a Tesseract enginge it throws the error "The program can't start because VCRUNTIME140.dll is missing from your computer. Try reinstalling the program to fix this problem." The strange thing is that a sample solution found here does compile, build and run, and either can find the dll or doesn't need it? I've checked the Configuration Manager and the Reference Manager. They all have

Fatal signal 11 (SIGSEGV) Error in Tesseract

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问题 I have developing an android ocr app with Tesseract Library. And I build the project with ndk-build. And I created my project and placed the eng.trainneddata(version 3.02) in the assets folder of my application and when I started my application I copied the file to the tessdata folder into my folder tivs . And i emulated into my one of the device with 1GB of RAM and 900MB free space of my phone it works perfectly. I tested that in my another device (Moto e) it tells the error Fatal signal 11

Tesseract improvements and image pre-processing steps

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问题 I am working on Tesseract library and below is the input for the Tesseract, At the initial step of implementation I have used only the "MRZ" zone of the ID card. But the actual intention is to scan the entire document and get all the texts in the ID card. I have gone through this document and to improve quality of Tesseract th first step is the image should be 300 dpi. 1) How to convert the captured camera image in ios to 300 dpi? 2) What should be the best contrast and brigtness level for

Fatal error: Failed to write core dump

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问题 I'm trying to run the unit tests in the tess4j distribution currently. And while running one of the unit tests, java crashed with the following error: TessBaseAPIGetIterator # # A fatal error has been detected by the Java Runtime Environment: # # EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x6718f834, pid=5612, tid=3592 # # JRE version: 7.0_17-b02 # Java VM: Java HotSpot(TM) Client VM (23.7-b01 mixed mode, sharing windows-x86 ) # Problematic frame: # C [libtesseract302.dll+0xf834] tesseract

How to split noise and text from the image for preprocessing of OCR

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问题 I am applying OCR against subtitle in TV footage. (I am using Tesseact 3.x w/ C++) I am trying to split text and background part as a preprocessing of OCR. Here's the original image: And, preprocessed image: The OCR result is: Sicemn clone As the above preprocessed image shown, there're some "fog" remained around the letter which prevents OCR module to do their job properly. Is there any way to recognize those "fog" programatically to remove, or do some image processing to remove/reduce it