Ramp vs Hanning Filter Image Reconstruction Explained

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Explore the subtle yet significant differences between Ramp and Hanning filters in image reconstruction. We compare their effects on contrast, noise, and edge sharpness to help you choose the best filter for your needs.
[30:43-31:12]
The statement is false. So let's see, uh, the difference of 2 different filters. We're gonna compare a ramp filter and a Hanning filter. Let's say this is the original or the ground truth, uh, cross-section. You can, uh, Radon transform this image and reconstruct it, you know, calculate back what it was using the ramp filter, and you get a result that looks like this.
[31:12-31:38]
If you use Hanning filter, it would look like this. It's a very subtle difference, not a whole lot. But if you look at the ramp filter, uh, results, the border line or the, the line around the white circles look pretty sharp. It's a good resolution, but, um, the white circles look kind of gray, meaning that you have a little bit lowered contrast.
[31:38-32:04]
And because of that, you see a little bit of a noise level increased as well. On the other hand, the Hanning filter reconstr- reconstruction result has a little bit better contrast and less noise. However, the edge of those circles look a little bit blurred. So both the resolution and the contrast are affected by which filter you use.

Видео Ramp vs Hanning Filter Image Reconstruction Explained канала Rigaku Corporation