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OpenCV 2 Computer Vision Application Programming Cookbook by Robert Laganière

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Eroding and dilating images using morphological filters

Erosion and dilation are the most fundamental morphological operators. Therefore, we will present them in this first recipe.

The fundamental instrument in mathematical morphology is the structuring element. A structuring element is simply defined as a configuration of pixels (a shape) on which an origin is defined (also called anchor point). Applying a morphological filter consists of probing each pixel of the image using this structuring element. When the origin of the structuring element is aligned with a given pixel, its intersection with the image defines a set of pixels on which a particular morphological operation is applied. In principle, the structuring element can be of any shape, ...

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