Abstract: A method for generating a digital filter for adjusting a brightness of a screen, the method being executed by a processor, the method comprising: receiving a captured image of a screen on which a reference image is projected by a projector, the captured image being captured by a camera; applying a spatial frequency filter to the captured image, thereby obtaining a spatially filtered image; determining a projector-space compensation filter based on the spatially filtered image, the projector-space compensation filter being configured for adjusting a brightness of the acquired image; and outputting the projector-space compensation filter.

Abstract: A visual display system uses commercial graphics processing units (GPUs) to determine an occlusion of calligraphic light points (CLPs) in a visual display. A color buffer pointer address of the GPUs is changed to point to a CLP subpixel counter and color datum associated with each CLP is changed to an identifier of the respective CLPs so that an occlusion count of GPU indications can be accumulated.