October 2015
Intermediate to advanced
230 pages
5h 10m
English
Content preview from OpenCV with Python BlueprintsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Hand shape analysis
Now that we know (roughly) where the hand is located, we aim to learn something about its shape.
Determining the contour of the segmented hand region
The first step involves determining the contour of the segmented hand region. Luckily, OpenCV comes with a pre-canned version of such an algorithm—cv2.findContours. This function acts on a binary image and returns a set of points that are believed to be part of the contour. As there might be multiple contours present in the image, it is possible to retrieve an entire hierarchy of contours:
def _find_hull_defects(self, segment):
contours, hierarchy = cv2.findContours(segment, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)Furthermore, because we do not know which contour we are looking for, ...
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