Hi everyone,

I'm working on a physics lab project where I want to measure the projectile motion of an object. I've asked my students to use the perspective filter to ensure their data is accurate, even if they take the measurements slightly at an angle. However, I'm having trouble with the filter. I've read the documentation, but it's quite brief and left me a bit confused.

In the video we're using, we have a 2-meter stick that we use to measure the size of a region in the image. I want to use the end points of the 2-meter stick to perform the perspective shift. I can align the perspective box in the input rectangle, and when I switch to the output, it appears that the perspective shift has changed.

However, the documentation mentions something about changing the output box to match the scales. I'm not sure what this means or what I'm supposed to do. Shouldn't providing the four points of a rectangle in the image be enough to correct the shift? I'd really appreciate any advice you can offer, as I'm at a loss!

Thanks,
Ben