Finding the resolution of the camera for image processing

Hey all! I calibrated my camera and using RGB colored markers I detected the triangle formed by these three colored markers and measured their distances. The error between real-time distance and that obtained by the camera was around less than or equal to 4mm For a resolution of 800x480. But I need 0.1mm. How do I do that? I can resolution, but how can I know that this resolution can give me a 0.1mm accuracy?

Thank you all.

Answer 1

[Image Analyst]

What is your field of view in mm? Divide that by 800 and tell me the size of one pixel on the scene.

[Emmanuel]

Field of view in the sense area covered by the camera?

[Image Analyst]

Are you looking at one square meter on your desk? Or at 10000 square kilometers on the surface of the moon? What is the real world width of your scene in real world units?

[Emmanuel]

its 12cm x 8 cm.

[Image Analyst]

So your resolution is 120 mm / 800 pixels = 0.15 mm per pixel. You do not have the resolution needed to resolve two objects 0.1 mm apart. You'd need a camera with higher resolution, unless you want to do some very complicated super-resolution things.