<p>Low-pass filtering is a classic tool from signal theory that will effectively remove noise, as you suggested, but will also cancel out desired high-frequency information in the image such as sharp edges. The image will look blurry.</p>

<p>Post-filtering Monte Carlo rendering results is an open field of research and many advances have been made over the years, and overview of which can be found in the <em>Denoising Your Monte Carlo Renders: Recent Advances in Image-Space Adaptive Sampling and Reconstruction</em> SIGGRAPH Course <a href="http://cgg.unibe.ch/publications/denoising-your-monte-carlo-renders">here</a>.</p>

CC BY-SA 3.0
2016-01-22T10:47:42.003Z
2016-01-22T10:47:42.003Z
David Kuri
<p>Is it possible that low pass filtering can be applied to Ray tracing ? </p>

<p>My guess is that since after the algorithm runs we have an image then low pass filtering helps in order to prevent aliasing from happening. Yet, I am not sure about this. Can someone elaborate on that?</p>

<raytracing>
Low Pass filtering
john john
# Low Pass filtering

(Asked by: username_0 on 2016-01-21)

Is it possible that low pass filtering can be applied to Ray tracing ?

My guess is that since after the algorithm runs we have an image then low pass filtering helps in order to prevent aliasing from happening. Yet, I am not sure about this. Can someone elaborate on that?

**Tags:** raytracing


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## 1 answers

### Answer by username_1 on 2016-01-22. Score: 9 | Accepted answer

Low-pass filtering is a classic tool from signal theory that will effectively remove noise, as you suggested, but will also cancel out desired high-frequency information in the image such as sharp edges. The image will look blurry.

Post-filtering Monte Carlo rendering results is an open field of research and many advances have been made over the years, and overview of which can be found in the *Denoising Your Monte Carlo Renders: Recent Advances in Image-Space Adaptive Sampling and Reconstruction* SIGGRAPH Course [here](http://cgg.unibe.ch/publications/denoising-your-monte-carlo-renders).


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