What is wrong with the attached contour dectection code?

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Explorer
Explorer 2019-11-29
编辑： KALYAN ACHARJYA 2019-11-30
The attached code opens webcame with bounding box. The bounding box is for the hand. The code should capture the image of the hand in the bounding box, detects
Code is supposed to do following things.
  1. Opens webcam with bounding box for hand
  2. The image of hand is captured by pressing spacebar key
  3. The hand image is cropped
  4. Skin is detected from the cropped image of hand
  5. draw contour of hand in white color on black image
But it is not doing so. Please help me.
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Explorer
Explorer 2019-11-30
My goal is to find contour of hand. Hand image is as follows.
test_image.jpg
Other hand images will be like
test_image2.jpg
test_image3.jpg
KALYAN ACHARJYA
KALYAN ACHARJYA 2019-11-30
编辑：KALYAN ACHARJYA 2019-11-30
More: you can easily segment those hands based on image preprocessing and thresholding.

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