Description: Non-linear filtering is a signal processing technique used to enhance specific features in images and data. Unlike linear filters, which apply a weighted combination of neighboring pixel values, non-linear filters operate in such a way that the output is not directly proportional to the input. This allows non-linear filtering to be more effective in noise removal and in preserving important edges and details in images. Key characteristics include the ability to adapt to different types of noise and the preservation of structures in the image, making it especially useful in applications where visual quality is crucial. Non-linear filters can include techniques such as the median filter, which replaces each pixel with the median of the pixel values in its neighborhood, and the bilateral filter, which considers both spatial proximity and color similarity to smooth images while preserving edges. In summary, non-linear filtering is a powerful tool in image processing and computer vision, enabling the enhancement of image quality and facilitating visual analysis.
