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gOCR

OCR Implementation with Golang

This project was mainly focus on Thai language and tested with some Thai characters, English characters and Arabic digits

gOCR

Implemented functions

  • Template generator
  • Image adjustment (automatic thresholding and median filter)
  • Rows and characters segmentation (horizontal histrogram and blob coloring)
  • Character recognition (image resizing and template matching)

How to use

Generate the Templates

gocr --gentemp <charlist.txt> <fontfile.ttf>

Templates of character list in charlist.txt with fontfile.ttf fontface will be generated in /templates directory

OCR

gocr <charlist.txt> <inputImage>

The inputImage and charlist.txt (the same one that use to generate templates) will be use for OCR. The output text file and images of each process will be saved in /outputs directory.

Example

Input image

Median filter + automatic thresholding

Rows segmentation

Characters segmentation

Text output

234sohappy
sawasdeewansao
ลูกกิดมาล้าว
สุขใจหรรษา
อิอิzaa55บวก

NOTE: You can notice some incorrect character recognition here

Terminal output

Test cases

No. Font style Capture method Correctness
1 Same as template Screen capture 58/58
2 Same as template, double font size Screen capture 58/58
3 Same as template Phone camera 57/58
4 Different font Screen capture 32/58
5 Different font Phone camera 34/58

What should be improve

  • Support multi-object characters (ex. ะ, ญ)
  • Better similar character recognition ( Dictionary? Machine Learning? Character type consideration?)
  • A space in between word recognition
  • Order recognition for lower and upper alphabet
  • Handle system error (ex. can't open file)

Main Resources

  • Golang : an open source programming language
  • GoCV : allow Go to access OpenCV 3
  • OpenCV : a computer vision library

About the project

Created by Withee Poositasai

Simple Thai OCR Project, CPE489 Image Processing and Computer Vision, KMUTT

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OCR implementation with Golang

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