video-ocr

Description

Using OpenCV, open the first capture device and run OCR on the input.

Usage

Example:

video-ocr [-s /dev/videoN]  [-l LANG] [-w WIDTH] [-h HEIGHT] [-r X,Y,W,H] ...

  -s FILE:    Capture source device
  -l LANG:    OCR language (eng, jpn, etc)
  -r X,Y,W,H: Specify rectangle to apply OCR. Multiple rectangles can be specified.
  
  See the source code for the other options.

Installation

go install github.com/omakoto/video-ocr/cmd/...@latest

Or, after git clone, run this:

$ ./00install.bash

Installing dependencies

GoCV (Golang OpenCV binding)

• Get from https://github.com/hybridgroup/gocv
• Follow the install instructions in the README
• As of 2024-12-30, I had to make the following change to Makefile on Ubuntu 24:
  • libtbb2 doesn't exist, so just remove it.
  • Change libdc1394-22-dev to libdc1394-dev

diff --git a/Makefile b/Makefile
index ccc035d..bcf4bbb 100644
--- a/Makefile
+++ b/Makefile
@@ -18,7 +18,7 @@ BUILD_SHARED_LIBS?=ON
 
 # Package list for each well-known Linux distribution
 RPMS=cmake curl wget git gtk2-devel libpng-devel libjpeg-devel libtiff-devel tbb tbb-devel libdc1394-devel unzip gcc-c++
-DEBS=unzip wget build-essential cmake curl git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libdc1394-22-dev libharfbuzz-dev libfreetype6-dev
+DEBS=unzip wget build-essential cmake curl git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev libtbb-dev libjpeg-dev libpng-dev libtiff-dev libdc1394-dev libharfbuzz-dev libfreetype6-dev
 DEBS_BOOKWORM=unzip wget build-essential cmake curl git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev libtbbmalloc2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libharfbuzz-dev libfreetype6-dev
 DEBS_UBUNTU_JAMMY=unzip wget build-essential cmake curl git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libdc1394-dev libharfbuzz-dev libfreetype6-dev
 JETSON=build-essential cmake git unzip pkg-config libjpeg-dev libpng-dev libtiff-dev libavcodec-dev libavformat-dev libswscale-dev libgtk2.0-dev libcanberra-gtk* libxvidcore-dev libx264-dev libgtk-3-dev libtbb2 libtbb-dev libdc1394-22-dev libv4l-dev v4l-utils libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev libavresample-dev libvorbis-dev libxine2-dev libfaac-dev libmp3lame-dev libtheora-dev libopencore-amrnb-dev libopencore-amrwb-dev libopenblas-dev libatlas-base-dev libblas-dev liblapack-dev libeigen3-dev gfortran libhdf5-dev protobuf-compiler libprotobuf-dev libgoogle-glog-dev libgflags-dev

gosseract (OCR using Tesseract)

• Install tesseract: https://github.com/tesseract-ocr/tessdoc/blob/main/Installation.md
  • sudo apt install tesseract-ocr libtesseract-dev
  • sudo apt install -y tesseract-ocr-eng tesseract-ocr-jpn