ocr

Digit Recognition with Bayesian classes

由 自闭症网瘾萝莉.ら 提交于 2019-12-21 16:46:34
问题 I need to write an OCR program for digits only. I will use MNIST datasets. The problem is I do not know where to start. There are a lot of papers which doesn't really explain the algorithm. I don't really have much knowledge about pattern recognition. So I have a few questions. Q1 : Where can I find the algorithm (or a tutorial) Q2 : How do I classify digits? I don't need very advanced things. First thing that comes to my mind is finding the ratio of upper half/lower half and left side/ right

Normalize car plate for OCR in OpenCV C++

由 两盒软妹~` 提交于 2019-12-21 12:36:56
问题 I'm doing some simple OCR car plate recognition system. I'm using HaarCascades to find car plate, and next i need to normalize this plate, to put it into my OCR module. I'm using floodfill to find main contours of a car plate, and then i perform Hough transform, to find upper and lower boarders of a car plate: Here's a part of code, where i perform Hough transform^ HoughLinesP(canny_img, lines, 1, CV_PI/180, 80, 80, 30 ); for ( size_t i = 0; i < lines.size(); i++ ) { line (output, Point(lines

How to cross compile tesseract ocr engine for iphone?

由 左心房为你撑大大i 提交于 2019-12-21 06:16:39
问题 I am struggling from past 1 week that how to compile the tesseract ocr enging for iphone. I have gon through through some link, But i couldn't find the proper way. Can anyone help me through step by step procedure. Thanks in advance. 回答1: That probably won't be enough. I know nothing about Tesseract OCR library but you will require the include directives, plus specify the directory to where the Tesseract header files are installed via a compiler switch (usually -I) and (possibly) link with

Does Tesseract neglect any nontext area in a scanned document?

由 纵饮孤独 提交于 2019-12-21 05:57:10
问题 I'm using Tesseract but I don't know whether it neglects any nontext area and targets text only. Do I have to remove any nontext area as a preprocessing step for better output? 回答1: Tesseract has a pretty good algorithm to detect text, but it will eventually give false-positive matches. Ideally, you would pre-process the image before submitting it to tesseract. Some time ago I engaged in a similar task, so I suggest you take a look at the following material: OpenCV C++/Obj-C: Detecting a

Does Tesseract neglect any nontext area in a scanned document?

由 此生再无相见时 提交于 2019-12-21 05:57:03
问题 I'm using Tesseract but I don't know whether it neglects any nontext area and targets text only. Do I have to remove any nontext area as a preprocessing step for better output? 回答1: Tesseract has a pretty good algorithm to detect text, but it will eventually give false-positive matches. Ideally, you would pre-process the image before submitting it to tesseract. Some time ago I engaged in a similar task, so I suggest you take a look at the following material: OpenCV C++/Obj-C: Detecting a

Android Camera Frame processing with MultiThreading

由 ≯℡__Kan透↙ 提交于 2019-12-21 05:55:19
问题 I am using OpenCV,Vuforia and Tesseract(tess-two) for my app. My system works like this: Vuforia detects the target and sends the full frame to OpenCV (JNI) OpenCV gets the frame and does some image processing to make it readable for Tesseract (JNI) Tesseract(tess-two) takes the byte arrays from opencv and does the OCR processings on the image(byte-array) My problem starts with the 3rd part. Since my aim is to do the ocr on real time camera frames, i am trying to use multi-threading to make

Extracting tables from a pdf

由 会有一股神秘感。 提交于 2019-12-21 05:06:16
问题 I'm trying to get the data from the tables in this PDF. I've tried pdfminer and pypdf with a little luck but I can't really get the data from the tables. This is what one of the tables looks like: As you can see, some columns are marked with an 'x'. I'm trying to this table into a list of objects. This is the code so far, I'm using pdfminer now. # pdfminer test from pdfminer.pdfdocument import PDFDocument from pdfminer.pdfparser import PDFParser from pdfminer.pdfinterp import

Plot digitization - scraping sample values from an image of a graph

由 我与影子孤独终老i 提交于 2019-12-21 04:22:17
问题 This isn't really "OCR", since it's not recognizing characters, but it's the same idea applied to curves. Anyone know of an image-processing library or established algorithm for retrieving the values from a (raster) plot image? For instance, in this graph, it's hard for me to read exact values with my eyes because there's such gaps between gridlines: I can use a straight edge or whatever, but it's still going to be error-prone. It would be great if there were software that could just take a

WindowsAPI调用和OCR图片识别

由 强颜欢笑 提交于 2019-12-21 04:07:18
WindowsAPI在每一台Windows系统上开放标准API供开发人员调用. 功能齐全.在这里只介绍三个部分. 1.利用API控制鼠标键盘. 2.对外部程序的读写和监听 3.对外部程序窗口的改动. 外部程序的意思就是.假设我的程序是360.辣么我能控制腾讯QQ客户端啥的. const int MOUSEEVENTF_MOVE = 0x0001; // 移动鼠标 const int MOUSEEVENTF_LEFTDOWN = 0x0002; //模仿鼠标左键按下 const int MOUSEEVENTF_LEFTUP = 0x0004; //模仿鼠标左键抬起 const int MOUSEEVENTF_RIGHTDOWN = 0x0008; //模仿鼠标右键按下 const int MOUSEEVENTF_RIGHTUP = 0x0010; //模仿鼠标右键抬起 const int MOUSEEVENTF_MIDDLEDOWN = 0x0020;// 模仿鼠标中键按下 const int MOUSEEVENTF_MIDDLEUP = 0x0040;// 模仿鼠标中键抬起 const int MOUSEEVENTF_ABSOLUTE = 0x8000; //标示是否采取绝对坐标 private const int WM_SETTEXT = 0x000C; const int BM

Android OCR using tess-two a fork of tesseract

由 馋奶兔 提交于 2019-12-21 02:54:20
问题 Am using OCR as a module in a project that am doing. After digging in deep for a week i thought that i should run a test application on eclipse just to see how accurately it works. i found tess-two a fork of tesseract as a support to my OCR. i downloaded tess-two from: https://github.com/rmtheis/tess-two/downloads I was all set i imported tess-two into my eclipse. I did set my eclipse for handling and building projects involving native code. I did build tess-two successfully after solving 1
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