January 2018
Intermediate to advanced
268 pages
6h 20m
English
Content preview from OpenCV 3.x with Python By Example - Second Edition
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Using getRotationMatrix2D, we can specify the center point around which the image would be rotated as the first argument, then the angle of rotation in degrees, and a scaling factor for the image at the end. We use 0.7 to shrink the image by 30% so it fits in the frame.
In order to understand this, let's see how we handle rotation mathematically. Rotation is also a form of transformation, and we can achieve it by using the following transformation matrix:
Here, θ is the angle of rotation in the counterclockwise direction. OpenCV provides finer control over the creation of this matrix through the getRotationMatrix2D function. ...
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