What morphological operation should I apply to get a noise free image?

I need a specific morphological operation to reduce the noise fro the following figure.

Answer 1

[Vidhi Agarwal]

Hi @Sudipto Chaki,

To remove noise from given image, try using “Morphological Gradient”, or “Noise Filtering with Morphological Reconstruction”.

• Morphological Gradient is the operation that is equal to the difference between dilation and erosion of an image.
• Noise Filtering with Morphological Reconstruction: Morphological reconstruction can be used to filter out specific patterns of noise by reconstructing the image from a marker image.

Output after using “Morphological Gradient” for removing noise is given below:

Output after using “Noise Filtering with Morphological Reconstruction” for noise removal is given below:

For better understanding of “Morphological Gradient” and “Noise Filtering with Morphological Reconstruction” refer to the following documentation using this command:

• web(fullfile(docroot,"help/images/morphological-dilation-and-erosion.html"))

Hope that helps!