OpenCV detect numbers

Question

I\'m using OpenCV on the iPhone and need to detect numbers in an image. I split the image into smaller images so each image has only one number (1-9). All numbers are printe

Answer 1

If the numbers are printed, the job is quite simple, you just need to figure out a nice set of features to match. If the numbers are one font, you can get away with this approach:

• Extract the number
• Find the bounding box
• Scale the image down to something like 10x8, try to match the aspect ratio

• Do this for a small training set, take the 'average' image for each number

• For new images, follow the steps above, but the last is just a absolute image difference with each of the number-templates. Then take the sum of the differences (pixels in the difference image). The one with the minimum is your number.

All above are basic OpenCV operations.