sir is there any difference between local mean and mean of a pixel?????????? i need to calculate the local mean and standard deviation of a pixel..... how to do it.... please do reply.....
For example, if you want sliding means and stds in all 3x3 neighborhoods
or if you don't have the Image Processing Toolbox
slidingstd=sqrt( conv2(A.^2,ones(3)/9,'same') - slidingmean.^2 );
I'm not sure you got the terminology right, but the mean of a pixel is just the value of the pixel, because a pixel has a single value unless you're talking about the pixel going across different color channels (in a true color or multispectral image) or across the z dimension in a volumetric image where each slice or plane is the image at a different depth. I don't think you're talking about such images and that you're talking about a normal gray scale 2D image. Correct me if I'm wrong.
The local mean is the mean of several pixels in a region (for example a rectangular 3 by 3 window) around the pixel. The code Matt gave you will do that.
regarding the local mean..how to find the local mean of an image from a user defined window of size n by n
I have an Image i want to calculate neighbor of each pixel and calculate mean, standard deviation of each pixel and apply a criterion I(x,y) - local mean >= max(threshold, standard deviation)... please help