shapes and hierarchy

asked 2014-10-11 05:10:40 -0600

Kimi
16 ●4

updated 2014-10-16 13:14:07 -0600

I have four shapes. They are inside each other so the first is contains the second and the second contains the third etc. How can I choose the fourth and third shapes usin hierarchy? (opencv,python)

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answered 2014-10-11 06:00:49 -0600

FooBar
2938 ●9 ●37 http://magazino.eu/

Have you had a look at this docu:

http://docs.opencv.org/trunk/doc/py_tutorials/py_imgproc/py_contours/py_contours_hierarchy/py_contours_hierarchy.html

If h is your hierachy and x is the id of your topmost shape, then y = h[x][2] is the first child and z = h[y][2] is the third level. Another shape on this level is z_1 = h[z][0] or z_2 = h[z_1][0] (and so on until z_i is -1).