I have added a gaussian noise of 5 to 15 dB to my images for creating practical scenario. I have used sobel filter for finding gradient magnitude. in my point of view sobel is better option for removal of gaussian noise and LOG is better option for removal of impulse noise. is my statement is correct and how to justify it?
The best choices for AWGN filtering are the gaussian filter or the bilateral one. If the Sobel function that you are using implements also a gaussian filter before the gradient kernel convolution, you are just ok. If not, you can add the filter before the sobel one.
I recommend using Micro-Cap (http://www.spectrum-soft.com/download/download.shtm). All EE's at Emerson used Micro-cap, even though it cost $4,000 each. There are no other electronic SPICE modeling programs even close to Micro-Cap capability.
Micro-Cap is now free. Andy Thompson, owner of Spectrum Software, has retired.
Micro-Cap does worst case analysis --- changing the tolerances of components --- changing the temperature --- etc. And it is easy to use.
I have used Micro-Cap for all of my electronic designs since 2001. When I tested prototypes, they worked exactly as the model predicted.
The website --- https://NDAcademy.FoxPing.com/ --- 2.8 Electronic Cascade RC Filters --- and --- 7.2 Electronic SPICE Models --- provide examples.
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