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Visual PsychophysicsFrom Laboratory to Theory$
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Zhong-Lin Lu and Barbara Dosher

Print publication date: 2013

Print ISBN-13: 9780262019453

Published to MIT Press Scholarship Online: May 2014

DOI: 10.7551/mitpress/9780262019453.001.0001

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Generating Stimuli

Generating Stimuli

Chapter:
(p.27) 3 Generating Stimuli
Source:
Visual Psychophysics
Author(s):

Zhong-Lin Lu

Barbara Dosher

Publisher:
The MIT Press
DOI:10.7551/mitpress/9780262019453.003.0003

The implementation of experiments generally starts with the definition of what is displayed to the observer. This chapter is designed to take the reader through a simple introduction to digital images and to show how to generate typical psychophysical stimuli. The methods include creation of simple geometric patterns and more complex images. The examples also provide a tour of common image manipulations, including image type conversions, fast Fourier transformation, convolution, and filtering operations. Taken together, these methods will allow the creation of the most commonly used classes of psychophysical stimuli.

Keywords:   Visual displays, Computer graphics, Digital images, Color images, Image type conversion, Image manipulation, Fast Fourier transformation

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