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Canny Edge TOP

This example implements a TOP exposing the canny edge detector using OpenCV's cuda functionallity.

For more information visit: https://docs.opencv.org/3.4/d0/d05/group__cudaimgproc.html#gabc17953de36faa404acb07dc587451fc

Prerequisites

Requires a reference to the OpenCV include and library folder. This example uses OpenCV 4.11, bundled by default with TouchDesigner 2025.30000 builds.

Requires an Nvidia GPU. Currently this example uses CUDA as the execution engine. Requires CUDA 12.8 Toolkit to be installed.

Parameters

  • Low Threshold: Minimum value for the intensity gradient to decide if it is used as a edge.
  • High Threshold: Maximum value for the intensity gradient to decide if it is used as a edge.
  • Apperture Size: Kernel size for the Sobel operator.
  • L2 Gradient: ndicating whether a more accurate L2 should be used to calculate the image gradient magnitude.

This TOP takes one input which must be 8 bit single channel.