lisudoku_ocr

This is a library for detecting sudoku grids from images.

https://crates.io/crates/lisudoku-ocr

Features

• Detects classic sudoku digits and pencilmarks.
• It works on screenshots and probably won't on random photos.

Installation

It uses OpenCV to detect lines and to split up the puzzle into squares and then Tesseract to detect digits.

You must have opencv installed. Follow the steps at https://github.com/twistedfall/opencv-rust/blob/master/INSTALL.md.

Download https://github.com/Shreeshrii/tessdata_shreetest/raw/master/digits.traineddata to /usr/local/share/tessdata/.

Running

Local image file

cargo run src/test_images/image9.png

See image

Returns a json with the grid string and marked cell candidates

{"grid":"473652090050943726926178345500704913300019007090300004005230079030000002200400030","candidates":[{"cell":{"row":0,"col":6},"values":[1,8]},{"cell":{"row":0,"col":8},"values":[1,8]},{"cell":{"row":1,"col":0},"values":[1,8]},{"cell":{"row":1,"col":2},"values":[1,8]},{"cell":{"row":3,"col":1},"values":[6,8]},{"cell":{"row":3,"col":2},"values":[2,8]},{"cell":{"row":3,"col":4},"values":[2,6,8]},{"cell":{"row":4,"col":1},"values":[4,6,8]},{"cell":{"row":4,"col":2},"values":[2,4,8]},{"cell":{"row":4,"col":3},"values":[5,8]},{"cell":{"row":4,"col":6},"values":[2,6]},{"cell":{"row":4,"col":7},"values":[5,6,8]},{"cell":{"row":5,"col":0},"values":[1,7]},{"cell":{"row":5,"col":2},"values":[1,7]},{"cell":{"row":5,"col":4},"values":[2,6,8]},{"cell":{"row":5,"col":5},"values":[5,6]},{"cell":{"row":5,"col":6},"values":[2,5,6]},{"cell":{"row":5,"col":7},"values":[5,8]},{"cell":{"row":6,"col":0},"values":[6,8]},{"cell":{"row":6,"col":1},"values":[1,4,8]},{"cell":{"row":6,"col":5},"values":[1,6]},{"cell":{"row":6,"col":6},"values":[1,4,8]},{"cell":{"row":7,"col":0},"values":[6,7]},{"cell":{"row":7,"col":2},"values":[4,7,9]},{"cell":{"row":7,"col":3},"values":[5,8]},{"cell":{"row":7,"col":4},"values":[6,8,9]},{"cell":{"row":7,"col":5},"values":[1,5,6,7]},{"cell":{"row":7,"col":6},"values":[1,4]},{"cell":{"row":7,"col":7},"values":[5,6]},{"cell":{"row":8,"col":1},"values":[1,8]},{"cell":{"row":8,"col":2},"values":[7,9]},{"cell":{"row":8,"col":4},"values":[6,9]},{"cell":{"row":8,"col":5},"values":[5,6,7]},{"cell":{"row":8,"col":6},"values":[5,6]},{"cell":{"row":8,"col":8},"values":[1,8]}]}

External image URL

cargo run https://upload.wikimedia.org/wikipedia/commons/thumb/e/e0/Sudoku_Puzzle_by_L2G-20050714_standardized_layout.svg/1200px-Sudoku_Puzzle_by_L2G-20050714_standardized_layout.svg.png

Instal crate globally

Running cargo install lisudoku-ocr will globally install the lisudoku-ocr binary so you can run

lisudoku-ocr any/file/path.png

Contribute

Join the discord server.

Running tests

cargo test