Chess Board Dataset

Photos by @mukund-v and @samryan18.

Description:

500 images of chess boards labeled with Forsyth–Edwards Notation for use in image classification. Includes both raw images and preprocessed images.

Example Original and Preprocessed

Directory Structure

labeled_originals/
# contains 500 board images labeled with FEN notation

labeled_preprocessed/
# contains preprocessed images labeled with FEN notation (1:1 correspondence with original photos)

Preprocessing Steps

1. Convert image to binary bitmap
2. Blur the image
3. Sobol Filter
4. Canny Edge Detectors
5. Finding Contours with cv2
6. "Prune the contours"—Ramer–Douglas–Peucker Algorithm to reconcile "almost lines"
7. Find line intersections
8. Sanity checks
   • convex hull
   • correct num points
   • check angles between lines
9. Warp images
10. Write to new files

More info on preprocessing can be found here. Thanks to @Elucidation for the start here.