Using OpenCV to Detect Clothing Buttons on a Sheet of Paper

Question

I don’t have a background in computer vision, but I was curious to know how I can use the OpenCV library to achieve the following goals:

I have a bunch of spare buttons sorted by color, style and diameter. For the most part they are circular. I scatter them evenly onto a piece of white paper and, under good lighting, photograph a high-resolution image with an average digital camera. How could I slice this image so that each individual element is drawn separately?

Thanks in advance.

Answer 1

Two possible ways:

1) hough (canny/sobel), . .

2) , . , !

, :

• : http://aishack.in/tutorials/an-introduction-to-contours/
• : http://aishack.in/tutorials/thresholding/
• hough: http://aishack.in/tutorials/hough-circles-in-opencv/

: .

Answer 2

, , : Canny Hough .

Answer 3

, . :

( , ), ,

cvFindContours

:

• cvFitEllipse, (a, b) .
• , PIab , cvContourArea, , a = b. ( )
• , . printContour, cvPrintContour, cvMinAreaRect2 ..

, .