Free TouchDesigner Component: projectorBlender Camera-Based Multi-Projector Blending (Markus Heckmann)

Overview

Markus Heckmann (snaut) shares projectorBlender on the Derivative forum, a component that calculates the blending between projectors in an array on a flat surface using a camera. All projectors need the same output resolution and a webcam must see the whole canvas; after the projector resolution, canvas resolution and canvas offset are set, Start Blending shows a sequence of checkerboards and then outputs the blended result.

The technique uses OpenCV's findChessboardCorners to detect the projected checkerboard and findHomography to relate it to the original, and the homographies are passed into a shader that calculates the blend. The author tested it with 3 projectors on a 3840x720 canvas, and ProjectorBlender.tox is a free download from the topic.