A typical system for use in vision research will consist of three principal parts: something for capturing an image, a computer for processing the image and a display device for presenting the image to a subject. In a large number of cases the capture stage is avoided by devising a stimulus that can be described in simple mathematical terms and using the computer to generate it, but all of the situations discussed here will have a computer and some kind of display device. Figure 5 shows such a typical system.

Fig 5. A Typical computer based visual stimulus generator.

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