gOCR

OCR Implementation with Golang

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

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

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