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Questions tagged [ocr]

Tag for questions on Optical Character Recognition (OCR), including the Mathematica function TextRecognize[].

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16
votes
2answers
319 views

How to TextRecognize a screenshot of code?

Are there any specific tricks or options to help TextRecognize work on a screenshot of an Input Cell or code in general? For example, here's a screenshot that ...
2
votes
0answers
55 views

Improving the accuracy of the bounding box detection of TextRecognize

My problem concerns the text position detection in a scan. My goal is to find the bounding boxes of the text. ...
1
vote
4answers
112 views

setting size of images which are result of TextRecognize

Im learning Mathematica and the Wolfram language for shot time by myself. Its a pain for me that many settings are somehow hidden. Now I spent hours to find solution for something I already did with ...
2
votes
0answers
68 views

Help find rectangles with numbers [closed]

I have this picture 1) Result must be like that 2) . But I can achieve it only if have good numbers with picture like that 3) With first image I have result: 4) I can't recognize numbers with ...
3
votes
2answers
98 views

Is it possible or how to extract message string from binarized list?

Given message copied from Silvia's profile page, a binarized list could be found bellow. ...
1
vote
0answers
132 views
1
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0answers
143 views

TextRecognize giving corrupted results on some images - Bug CASE 4075220

Maybe the question sounds - is this a Mathematica error or what do I understand wrongly? Im having troubles to learn using Textrecognize because Im getting repeatedly errors which when I analyse ...
4
votes
2answers
367 views

How to improve the recognition quality when TextRecognize work on single character

Bug introduced in 11.0 and persisting through 11.3 From this answer, I doubt the capability to work on single character. So I give some test to verify this possibility. You can get my test ...
86
votes
1answer
12k views

Crack CAPTCHA using deep learning

Deep convolutional neural networks are very good at computer vision related tasks. Optical Character Recognition (OCR) is one important branch of computer vision. In fact, the convolution neural ...
0
votes
0answers
116 views

can I train the Textrecognize (or the Tesseract behind) for real typewriter letters?

Can I improve result of the TextRecognize by training the machine which is behind? Id like to work with a lot of scanned texts from several (real) typewriters. It seems to me that TextRecognize gives ...
2
votes
0answers
26 views

cannot recognize accented characters using TextRecognize

Im unable to force TextRecognize understanding Czech characters like "ě, š, č,..." . Adding " .. ; Language -> "Czech" " gives me exactly the same bad result as with "English" or "German". My setup - ...
4
votes
1answer
189 views

Recognizing characters with accent marks

I have written code to recognize some words, but I get errors in the recognition of some characters with accent marks. Is there any solution? ...
2
votes
1answer
206 views

Failed to load TesseractTools in Mathematica 11 running on Raspberry Pi

Version where this occurred: Mathematica: Version - 11.0.1.0 Platform - Linux ARM (32-bit) Raspbian: Version - September 2017 Release Date - 2017-09-07 Kernel Version - 4.9 Attempting to do OCR ...
27
votes
3answers
1k views

Improve TextRecognize[] on numbers

I have an image contain only numbers, and TextRecognize fail to recognize some numbers: img=; TextRecognize[img] (*826718*) The documentation says that "The ...
0
votes
2answers
233 views

Blank output from TextRecognize

Why am I getting blank output from TextRecognize for the following image? Is it because of the size of the image? Neither am I getting output for this code: ...
3
votes
0answers
206 views

Recognize text in an image

How can I use TextRecognize to recognize text in an following image?
2
votes
1answer
198 views

How to import Robinhood screenshots?

I use an iPhone app called Robinhood to trade stocks and I wanted to play with the portfolio with Mathematica's finance tools. So I took some screenshots of the app and I'm trying to import the ...
5
votes
1answer
171 views

Finding position of text returned with TextRecognize

I am trying to extract data from images (using some of the methods presented in [1524]), and would like to have a way to selectively cover/remove text from axes and legends. ...
4
votes
1answer
509 views

How can I separate a scanned text to its letters?

I am looking for a simple way to recognize musical Unicode text (written in byzantine musical notation). My idea is to compare each musical symbol with the scanned text and find all the coordinates(...
8
votes
1answer
252 views

Providing an image or PDF file as an input to the Handwritten Math Recognition Engine

On Windows 7 and higher Mathematica supports Handwritten Math Recognition feature (it is available under the menu Window — Handwriting Input). The interface allows to use touchscreen to draw ...
6
votes
2answers
896 views

Crack it if you can? But in the best way

From the Wolfram Community posted by Helen: A little while ago I was asked to solve this "safe cracker" puzzle, a sweet example of a coffee table puzzle. The basic gist of this puzzle is that it ...
3
votes
1answer
167 views

How do I remove text from an image?

I want to remove "the worst of times" from this image. How do I do that? I don't have a preference to how it's done.
7
votes
2answers
360 views

problem to recognize a table through a png image

This is I think an already asked question but I at the margin there are some new points I have this file found on internet and now I want to recognize the table with the following commands ...
25
votes
0answers
1k views

Handwriting recognition with Mathematica

I am trying to teach Mathematica to read my handwriting. Since I don't want to ruin my reputation by showing my own handwriting, I am going to use a font called blackjack. Lets say this is a ...
5
votes
0answers
135 views

Geographic text recognition [closed]

I would like to process an image from this Wikipedia page to get the structured data out Like so <| "New York" -> 28, ... |> Not sure where to start.
14
votes
1answer
2k views

How to speed up text recognition

I have a large corpus of text to analyse. I've managed to automate splitting it into individual lines because I've found that each line in this relatively old scanned document needs to be dealt with ...
17
votes
1answer
918 views

How to identify chemical substance from tattoo?

A friend of mine made a tattoo on his chest of some chemical substance formula. He challenged us to identify which substance is that. I thought that perhaps a combination of: Mathematica image ...
11
votes
2answers
2k views

Recognizing integers in an image

This is the picture I want Mathematica to read I want Mathematica to recognize these numbers and put them in a list. I know that there is a function TextRecognize, ...
0
votes
0answers
119 views

Recognizing text and Mathematica special characters when copying expressions from a PDF

I could not find something relevant. Last days I am reading Leonid Shifrin's masterpiece but I cannot copy-paste either from the pdf or from the electronic version. Consider the function ...
13
votes
1answer
1k views

Can I OCR Mathematica code on an image?

There's no doubt that one should always post the Mathematica code text rather than its screenshot when asking questions in this site, but every time I saw someone posting a screenshot, I can't help ...
2
votes
0answers
327 views

How to do text recognition in a language that doesn't use the roman alphabet [closed]

I am trying to reconize a single letter or character from a non-roman character set by edge detection. I want to extract single characters from a text image. When I identify that letter or character I ...
2
votes
2answers
243 views

Extracting coordinates from a ListLinePlot

I used an iterative method to resolve equations, then i plotted the results using ListLinePlot. Unfortunately, now I need to use some of the data that was plot. I know the X-coordinate, and need to ...
13
votes
1answer
533 views

Why does cropping an image improve TextRecognize so much?

I am trying to use the TextRecognize function to extract data from certain screenshots. This is already a cropped version. Using TextRecognize on this yields ...
1
vote
0answers
335 views

How can I detect certain letters by shape in an image? [closed]

I have a website where people can post Flipbook animations, called Flipnotes. Unfortunately, most of the Popular flipnotes are in the following categories: MV (Music Video) AV (Audio Video) AMV (...
30
votes
1answer
2k views

Can TextRecognize read digits?

While answering this question, I tried TextRecognize to read single digits. But it doesn't recognize a single digit, even though the digits are clearly readable. ...
0
votes
1answer
263 views

Character segmentation in poor quality grayscale

Given grayscale lines from a receipt like this: , in which parts of the letters sometimes appear almost as light as the background, my goal is to determine the $x$-positions of the centres of the ...
8
votes
1answer
459 views

Detect implicit grid in image with monospaced characters

I'm trying to detect the monospaced-grid in a possibly slightly deformed image of a receipt. Example input (full size here) My idea is to obtain the centroids or bounding boxes of all components and ...
8
votes
0answers
178 views

Ways to overcome failure of TextRecognize on relatively simple price tag?

I would like to perform OCR on this sample image. TextRecognize[Import["RedBox.jpg"], Language -> "German"] returns ...
60
votes
3answers
4k views

Applying TextRecognize on alpha-numerical table

From time to time I have to extract data from scanned papers or rasterized PDFs. Imagine a table of the following kind (but much longer): A naive application of ...
13
votes
1answer
464 views

Use TextRecognize to grab timestamps from a video frame

I have microscope videos that have a timestamp overlay to them, and it would be great if I could extract this for each frame to add to my metadata. TextRecognize ...
0
votes
1answer
219 views

TextRecognize with crosses, circles and spaces results into oddities, why?

I am investigating this answer here about detecting crosses and circles with TextRecognize. I tried to solve this problem here by directly using the builtin command TextRecognize but it does not work ...
31
votes
3answers
2k views

How to detect crosses and circles in 60x60 raster images?

I have hand-written 60 pixel times 60 pixel squares. I need to detect whether they are empty, x or circle. TextRecognize function fails. Is there some other function to process this kind of raster ...
5
votes
1answer
596 views

Accessing the graph Thinning produces without losing all the edges' lengths/slopes

This is a follow up to the OCR question I had earlier. What I want to do is to use Thinning to create "skeletons" of images of characters and then compare their shapes, utilizing such properties as ...
13
votes
1answer
2k views

Implementing OCR without using TextRecognize

I am new to Mathematica and trying to figure out whether it is a good tool for algorithmic exploration. So I had the idea of implementing a simple OCR with Mathematica, just using standard algorithms....