Shulou(Shulou.com)05/31 Report--

This article mainly introduces the relevant knowledge of how C++ to achieve median filtering, the content is detailed and easy to understand, the operation is simple and fast, and has a certain reference value. I believe everyone will gain something after reading this C++ article on how to achieve median filtering. let's take a look.

Median filter is a kind of nonlinear filter, or statistical sort filter.

Applicable object: images with salt and pepper noise

Because the pixel value of salt and pepper noise is not related to the pixel value of the original image, the randomness is large, so the median filter can effectively filter out the noise.

Median filtering needs to sort pixel values, so first write a bubble sorting algorithm.

Bubble sorting implementation:

In order to improve efficiency, the flag bit flag is added. When looking for the maximum value for the first time, if the adjacent two numbers are not interchanged, then the flag bit is false, which means that the array has been arranged incrementally at this time and can be terminated in advance. We should pay attention to the location of flag=false here, because we need to ensure that during the first search for the maximum value, we traverse all the data that do not participate in the arrangement, so the flag=false should be placed in the loop condition for (int jarg0; j).

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