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Questions tagged [leptonica]

Leptonica is open source software used for image processing and analysis.

148 questions
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Tesseract Training - Error reading radical code table data/langdata/radical-stroke.txt

I've tried to train Tesseract OCR on specific font, based on polish language model (pol) and my own "ground truth" text - it may be important, that the one generated by me does not contain all chars from polish charset, because in my application of…
JP JP
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Convert pixel values in thermal image with embedded metadata

I am capturing thermal images using a FLIR Lepton 3.5 thermal camera and ESP32 WROVER E module. I am getting the pixel values that I can see on the serial monitor. Then I convert these pixel values into thermal images using Python code. But when I…
Pushpanjali Singh
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Valgrind Memory check complains on TessBaseAPI

Working on memory leaks, just faced that valgrind memcheck sees serious leak on TessBaseAPI initialization call. Update: official Tess Sample gets warning from valgrind https://tesseract-ocr.github.io/tessdoc/Examples_C++.html api4->Init is there…
JamesQReader
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STM32f4 interfacing with thermal camera

We are interfacing FLIR lepton 3.5 thermal camera with STM32f407VET6 to capture thermal image. In our system, the AGC is disabled by default, we enabled VSYNC using I2C protocol. Currently the code is reading packet number and printing it on…
Pushpanjali Singh
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C# - Failed to find library "leptonica-1.80.0.dll" for platform x64

I am creating a console application using Tesseract 5.2.0 below is my code for the same. System.Drawing.Bitmap img = new System.Drawing.Bitmap(convertedFile); //TesseractEngine engine = new TesseractEngine(convertedFile, "eng",…
Ibrahim shaikh
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Tesseract does not work within a Docker image with ubuntu 20.04 called from within a Java Spring App

I want to call tesseract from a Java Spring Boot application running on Ubuntu 20.04 in a Docker Image. Tesseract fails with the following log entry: java.lang.UnsatisfiedLinkError: Error looking up function 'boxaSizeConsistency':…
SirNight
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Tesseract character recognition and C++

I read single characters with C++ and tesseract/leptonica. Below is chunk I use. is it possible to improve accuracy to use some special function, in case if I read only one character. Of course I have openCV mat with cropped image to fit the…
JamesQReader
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I tried to build something, but this error came and I couldn't get SW also

By not providing "FindSW.cmake" in CMAKE_MODULE_PATH this project has asked CMake to find a package configuration file provided by "SW", but CMake did not find one. Could not find a package configuration file provided by "SW" with any of …
Arthur Maciel Batista
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Build tesseract as DLL Dynamic link library

I'm using this .NET wrapper https://github.com/charlesw/tesseract and I wanted to update the included tesseract and leptonica DLLs but after a long google search I was not able to generate them from the original tesseract and leptonica github…
Seltix
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How does one link and include lib-leptonica in a cross platform make file?

I have the following cmake command: include(FindPkgConfig) # ditto for tesseract pkg_search_module(LEPT lept) find_library( LEPT NAMES leptonica liblept liblept-dev lept HINTS ${LEPT_INCLUDE_DIRS}…
Chris
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Installing and using Leptonica library on Windows with Visual Studio

What I did: Downloaded sw, leptonica source and cmake. Executed 'ms build' in leptonica source directory -> '.sw' folder. Build a visual studio project from the leptonica source with cmake -> 'build' folder. Opened the project and build it (debug,…
Created
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leptonica/allheaders.h is missing for tesseocr installation on M1 macs with homebrew

i was trying to install normcap for OCR reading of images but i got into an error and don't understand how to solve it. PC - Macbook M1 chipset homebrew 3.1.7 installed and working fine. CommandLinetools 12.5 have been installed(Apple). Leptonica…
Danta
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Tesserocr installation on Mac M1

I have tried a lot, but still, I don't know why unable to install Tesserocr and leptonica on Mac M1. the error is here, thanks for your help. ERROR: Command errored out with exit status 1: command: /Users/mahdiseify/opt/anaconda3/bin/python -u -c…
mseify
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how to get VERSION installed of LEPTONICA from console?

I'm at CentOs 8 and I installed http://www.leptonica.org/source/leptonica-1.80.0.tar.gz in this form: wget http://www.leptonica.org/source/leptonica-1.80.0.tar.gz tar xzvf leptonica-1.80.0.tar.gz cd leptonica-1.80.0 ./configure make && make…
B UTP
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Error compiling Leptonica (for Tesseract) on IBMi (AS400,iSeries) for Power PC

I am trying to compile Tesseract so I can run it on IBMi 7.3 (AS400, iSeries, System/i) which has a Power PC architecture. I haven't done any C compiling with makefiles for decades so I found and am following these instruction (with thanks) and am…
M. A. Wheadon
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