The VideoToolbox software for visual psychophysics: transforming numbers into movies* DENIS G. PELLI** Departrnent of Psychology, New York University, 6 Washington Place, New York, NY 10003, USA Received 1 February 1996; revised 8 September 1996; accepted 8 September 1996 Abstract-The VideoToolbox is a free collection of two hundred C subroutines for Macintosh computers that calibrates and controls the computer-display interface to create accurately specified visual stimuli. High-level platform-independent languages like MATLAB are best for creating the numbers that describe the desired images. Low-level, computer-specific VideoToolbox routines control the hardware that trans- forms those numbers into a movie. Transcending the particular computer and language, we discuss the nature of the computer-display interface, and how to calibrate and control it. 1. INTRODUCTION Using a high-level platform-independent language like MATLAB, it's easy to pro- duce a matrix of numbers specifying the desired luminances of all the pixels in the displayed image. Many of today's off-the-shelf personal computers can copy those numbers from memory to video memory quickly enough to show a new image on every frame of a CRT monitor. However, high-level languages generally provide only rudimentary control of the vital transformations from number to color, and of the rate at
Spatial Vision (continued as Seeing & Perceiving from 2010) – Brill
Published: Jan 1, 1997
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