July 2015
Intermediate to advanced
174 pages
3h 45m
English
Content preview from OpenCV Computer Vision with JavaBecome 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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Geometric transforms – stretch, shrink, warp, and rotate
While working with images and computer vision, it is very common that you will require the ability to preprocess an image using known geometric transforms, such as stretching, shrinking, rotation, and warping. The latter is the same as nonuniform resizing. These transforms can be realized through the multiplication of source points with a 2 x 3 matrix and they get the name of affine transformations while turning rectangles in parallelograms. Hence, they have the limitation of requiring the destination to have parallel sides. On the other hand, a 3 x 3 matrix multiplication represents perspective transforms. They offer more flexibility since they can map a 2D quadrilateral to another. The ...
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