Expanding the horizontal capabilities of CRT monitors using artificial inter-pixel steps for neuroscience experiments

This article describes the development of a visual stimulus generator to be used in neuroscience experiments with invertebrates such as flies. The experiment consists in the visualization of a fixed image that is displaced horizontally according to the stimulus data. The system is capable of display...

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Bibliographic Details
Published in:Digital signal processing 2012-03, Vol.22 (2), p.367-375
Main Authors: Gazziro, Mario, Fernandes, Nelson, Almeida, Lirio, Matias, Paulo, Slaets, Jan
Format: Article
Language:English
Subjects:
CRT monitors
Digital signal processing
FPGA
Frames per second
Generators
Horizontal
Invertebrates
Monitors
Movements
Neuroscience
Real-time video processing
Visual
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Summary:This article describes the development of a visual stimulus generator to be used in neuroscience experiments with invertebrates such as flies. The experiment consists in the visualization of a fixed image that is displaced horizontally according to the stimulus data. The system is capable of displaying 640×480 pixels with 256 intensity levels at 200 frames per second (FPS) on conventional raster monitors. To double the possible horizontal positioning possibilities from 640 to 1280, a novel technique is presented introducing artificial inter-pixel steps. The implementation consists in using two video frame buffers containing each a distinct view of the desired image pattern. This implementation generates a visual effect capable of doubling the horizontal positioning capabilities of the visual stimulus generator allowing more precise and movements more contiguous.
ISSN:1051-2004
1095-4333
DOI:10.1016/j.dsp.2011.01.009