April 2017
Beginner to intermediate
250 pages
6h 28m
English
Content preview from Mastering OpenCV 3 - Second Edition
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Elliptical mask
Although we have already removed most of the image background and forehead and hair when we did the geometrical transformation, we can apply an elliptical mask to remove some of the corner region such as the neck, which might be in shadow from the face, particularly if the face is not looking perfectly straight towards the camera. To create the mask, we will draw a black-filled ellipse onto a white image. One ellipse to perform this has a horizontal radius of 0.5 (that is, it covers the face width perfectly), a vertical radius of 0.8 (as faces are usually taller than they are wide), and centered at the coordinates 0.5, 0.4, as shown in the following image, where the elliptical mask has removed some unwanted corners from the ...
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