Prepending an affine transformation (Affine2D) to the data transform of an image allows to manipulate the image's shape and orientation.This is an example of the concept of transform chaining. Before talking about affine transformations, let's see what Euclidean transformations are. The Affine cipher is a type of monoalphabetic substitution cipher, wherein each letter in an alphabet is mapped to its numeric equivalent, encrypted using a simple mathematical function, and converted back to a letter. You can rate examples to help us improve the quality of examples. The elements of the matrix map the coordinates from the input array to the output. Read the image; Define the 3 pairs of corresponding points (See image above) Calculate the transformation matrix using cv2.getAffineTransform() Apply the affine transformation using cv2.warpAffine() Affine transform of an image¶. Previous topic. Gallery generated by Sphinx-Gallery. An affine transformation is a geometric transformation that preserves points, straight lines, and planes. Now, letâs take the above example of a mirror image and see how to apply affine transformation using OpenCV-Python. ... Download Python source code: plot_features.py. This page shows Python examples of cv2.estimateAffinePartial2D. An affine transformation matrix provides directions for up to four types of changes: translating, rotating, rescaling and shearing. Euclidean transformations are a type of geometric transformations that preserve length and angle measure. I have solved the finding of the correct affine matrix, however I cannot apply an affine transformation on a color image. From the above, we can use an Affine Transformation to express: Rotations (linear transformation) Translations (vector addition) Scale operations (linear transformation) you can see that, in essence, an Affine Transformation represents a relation between two images. 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