A pixel-resolution video switcher for eye-contingent display changes
Author: Van Diepen, Paul M.J.1
Source: Spatial Vision, Volume 10, Number 4, 1997 , pp. 335-344(10)
Publisher: VSP, an imprint of Brill
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Abstract:
Moving-mask and moving-window paradigms are used to study the spatial and temporal aspects of visual information processing. Due to technical limitations, these paradigms have frequently been applied to reading, but only rarely to scene perception. Existing moving-mask or moving-window techniques for graphical stimuli usually blank the display inside or outside a square window, respectively. A new moving-window technique is presented here that uses a purpose-designed video switcher and three synchronized video boards. The first video board contains the stimulus presented inside the window. The second video board contains the stimulus to be presented outside the window. The third video board contains a black-and-white image of the window that is used as a key signal for the video switcher. The video switcher selects between the video signals of the first and the second video board on a pixel-by-pixel basis, controlled by the key signal generated by the third video board. By panning the image of the third video board, the window can be moved very rapidly. Here we use oval windows, centered on the fixation spot as measured by an eye-tracker. The normal stimulus is visible inside the window, whereas manipulated information is presented outside the window, or vice versa.Document Type: Research article
DOI: 10.1163/156856897X00258
Affiliations: 1: Laboratory of Experimental Psychology, University of Leuven, Tiensestraat 102, B-3000 Leuven, Belgium
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