OpenCV 2 Computer Vision Application Programming Cookbook by Laganiere Robert
Author:Laganiere, Robert
Language: eng
Format: epub
Publisher: Packt Publishing
Clearly, the noisy pixels shifted the mean value of neighboring pixels. As a result, the noise is still visible even if it has been blurred by the mean filter.
The median filter also has the advantage of preserving the sharpness of the edges. However, it washes out the textures in uniform regions (for example, the trees in the background).
Applying directional filters to detect edges
The first recipe of this chapter introduced the idea of linear filtering using kernel matrices. The filters used had the effect of blurring an image by removing or attenuating its high-frequency components. In this recipe, we will perform the opposite transformation that is amplifying the high-frequency content of an image. As a result, the high-pass filters introduced here will perform edge detection.
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