November 2018
Intermediate to advanced
492 pages
12h 19m
English
Content preview from Hands-On Image Processing with Python
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With opencv and opencv-contrib
In order to be able to use the SIFT functions with python-opencv, we first need to install opencv-contrib by following the instructions from this link: https://pypi.org/project/opencv-contrib-python/. The next code block demonstrates how to detect the SIFT keypoints and draws them using the input Mona Lisa image.
We will first construct a SIFT object and then use the detect() method to compute the keypoints in an image. Every keypoint is a special feature, and has several attributes. For example, its (x, y) coordinates, angle (orientation), response (strength of keypoints), size of the meaningful neighborhood, and so on.
We will then use the drawKeyPoints() function from cv2 to draw the small circles around ...
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