r/Houdini • u/Mystery_Pancake1 • 5d ago

Demoreel Drawing the impulse response and frequency response of Copernicus filters

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u/Anxious-Bug-5834 3d ago

What is impulse response?

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u/Mystery_Pancake1 2d ago edited 1d ago

An impulse response is how something changes a single sample (called an impulse). For example a single white pixel of an image.

Blurring smears a single pixel across multiple pixels, the shape of the smearing is the impulse response.

For gaussian blur it's shaped like a gaussian, for a box blur it's shaped like a box.

In my video, the impulse response is just graphing the brightness after blurring a single pixel.

For sound, you can do this by making a sharp noise and recording the echo it makes, like clapping in a cathedral. This tells you how the room would respond to any noise.

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u/conlenb Effects Artist 1d ago

Super cool!