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
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera