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The VideoToolbox software for visual psychophysics: transforming numbers into movies
1Department of Psychology, New York University, NY 10003, USA. denis@psych.nyu.edu
Spatial Vision
|January 1, 1997
Summary
VideoToolbox provides free C subroutines for Macintosh computers, enabling accurate visual stimuli calibration and control. This system bridges high-level image description languages and low-level hardware for precise visual display generation.
Area of Science:
- Computer Vision
- Human-Computer Interaction
- Visual Neuroscience
Background:
- Accurate visual stimuli are crucial for scientific research.
- Controlling computer displays for precise visual output is challenging.
- Existing tools often lack cross-platform compatibility or are difficult to use.
Purpose of the Study:
- To introduce VideoToolbox, a free software collection for precise visual stimulus generation.
- To detail the calibration and control of the computer-display interface.
- To provide a method for creating accurate visual stimuli independent of specific hardware or software.
Main Methods:
- Developed VideoToolbox, a library of 200 C subroutines for Macintosh computers.
- Implemented routines for calibrating the computer-display interface.
- Designed methods to control hardware for accurate visual stimulus presentation.
- Utilized high-level languages (e.g., MATLAB) for image description and low-level routines for display control.
Main Results:
- Successfully created a system for accurately specified visual stimuli.
- Demonstrated the ability to calibrate and control the computer-display interface.
- Provided a framework for generating visual stimuli that transcends specific computer platforms and programming languages.
Conclusions:
- VideoToolbox offers a powerful and accessible solution for researchers needing precise visual stimuli.
- The principles of computer-display interface calibration and control are broadly applicable.
- This work facilitates more reliable and reproducible visual experiments.
