gmadrid / fpc

Find playing cards in an image.

FPC

I have a giant image file (generated from a PDF) that contains images of playing cards. I have been finding it a little impractical in use. I want to create a tool that will:

• find the card images (possibly given hints)
• determine the image bounds for the cards
• add padding, if desired
• enforce a desired aspect ratio on the bounding boxes. (Like 2.5:3.5 for Poker cards.)
• output images at a desired size for all of the cards.
• put rounded corners on the output images
• allow specifying a background color (since my input image is transparent)

Optional features that are probably useful for debugging

• output a single card
• output just the bounding box (maybe plus some padding)
• maybe show the bounding box outlined in red or some other color.

NOTE: I cannot include my input playing card image in this project since it is a commercial product and not mine to share.

Notes on test data

Test images are all 72px/in.

NOTE: from Illustrator, set up an image of 2.5inx3.5in.
Export to PDF: check off Use Artboards, and Screen (72ppi) for Resolution.

1. circle: a circle centered in a transparent image.
   • image dimensions: 2.5inx3.5in (180x252)
   • circle center: 90ptx126pt
   • circle diameter: 70pt
   • expected bounding box: (55,91)=70x70
2. rect: a rect centered in a transparent image.
   • image dimensions: 2.5inx3.5in (180x252)
   • Rect at 40,66
   • Rect size 100x120
3. circle_border: a circle centered in a transparent box with a black border.
   • image dimensions: 1inx1.25in
   • circle at 21,30
   • circle diameter: 30px
4. grid: a 3x4 grid of images containing geometric shapes with a gray border between them.

Other random notes.

2.5/3.5 = 0.71428571428
So a card with width 100 will be 100x140.