use wavelet denoising, mathworks has demos for this

https://www.mathworks.com/help/wavelet/ug/wavelet-denoising.html

IMAGE_DENOISE is a MATLAB program which uses the median filter to try to remove noise from an image.

https://in.mathworks.com/help/images/noise-removal.html?s_tid=gn_loc_drop

https://in.mathworks.com/matlabcentral/answers/21244-noise-detector-in-images

http://in.mathworks.com/matlabcentral/newsreader/view_thread/297228

https://people.sc.fsu.edu/~jburkardt/m_src/image_denoise/image_denoise.html

https://in.mathworks.com/matlabcentral/answers/21244-noise-detector-in-images

I want to detect the noisy pixels and show them on a blank image(white/black) of a noisy image. How I can do this.????? Kindly help me in this regard

I have studied this paper "Image denoising with patch based PCA: local versus global"   and its code.