This program demonstrates how an OpenGL fragment program can be used to compensate for pincushion distortion in real time. This software is particularly useful for head-mounted displays which frequently have a significant amount of pincushion distortion.
Recent versions of Vizard include lens distortion correction software that is based on this software. The Vizard documentation includes a description of this feature. The following two lines of code enable lens correction in Vizard (the k1 parameter should be changed to approximate the amount of distortion in your display):
import vizlens pincushion = vizlens.PincushionDistortion(k1=0.1,scaleToFit=True)Demonstration:
- View of checkerboard in HMD without correction
- View of checkerboard in HMD with correction
- Note: Although the images above are not antialiased, you can easily toggle antialiasing on and off in the OpenGL code below.
