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The best image processing tool is MATLAB. It has huge supportive community that can help you out if you face any hardship while using the tool.

Do you want to process digital image or analog image?

Well digital image.

Ok in that case, techniques involved in digital image processing are: Image Editing – this is basically modifying digital images by means of graphic software tools. Image Restoration – this technique refers to the estimation of a clear image among the corrupt image. Anisotropic Diffusion – this technique is often known as Perona-Malik Diffusion and enables you to reduce image noise without eliminating important parts of the image.

The most popular digital image processing techniques are linear filtering and neural networks. Linear filtering refers to processing time-varying signals and generating output signals subject to the constraint of linearity. Neural Networks is used in machine learning for solving different image processing tasks.