Image Denoising with Better Edge Preservation

1. Is Gaussian filter edge preserving?
2. Is denoising dead?
3. What is the major challenge for denoising methods while removing noise from an image?
4. What are the denoising techniques?

Is Gaussian filter edge preserving?

If one method smooths out the large gradient, it is not edge preserving. Such methods include the classical isotropic diffusion filters like Gaussian filter and box filter.

Is denoising dead?

We show that despite the phenomenal recent progress in the quality of denoising algorithms, some room for improve- ment still remains for a wide class of general images, and at certain signal-to-noise levels. Therefore, image denoising is not dead—yet.

What is the major challenge for denoising methods while removing noise from an image?

Image denoising procedures remove noise and restore a clean image. A major problem in image denoising is how to distinguish between noise, edge, and texture (since they all have high-frequency components).

What are the denoising techniques?

There are three basic approaches to image denoising – Spatial Filtering, Transform Domain Filtering and Wavelet Thresholding Method.