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Learning Image Processing with OpenCV by Gloria Bueno García, Oscar Deniz Suarez, José Luis Espinosa Aranda, Jesus Salido Tercero, Ismael Serrano Gracia, Noelia Vállez Enano

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Geometrical transformations

Geometrical transformations do not change the image content but instead deform the image by deforming their grid. In this case, output image pixel values are computed by first obtaining the coordinates of the appropriate input pixels by applying the corresponding mapping functions and copying the original pixel values from the obtained positions to the new ones:

Geometrical transformations

This type of operation has two problems:

  • Extrapolation: fx(x,y) and fy(x,y) could obtain values that indicate a pixel outside the image boundary. The extrapolation methods used in geometrical transformations are the same as the ones used in image filtering plus ...

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