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Human Visual System - Washington State University

Human Visual System In many image processing applications, the objective is to help a Human observer perceive the Visual information in an image. Therefore, it is important to understand the Human Visual System . The Human Visual System consists mainly of the eye (image sensor or camera), optic nerve (transmission path), and brain (image information processing unit or computer). It is one of the most sophisticated image processing and analysis systems. Its understanding would also help in the design of efficient, accurate and effective computer/machine vision systems. Cross-section of the Human Eye Cross-section of the Human Eye Nearly spherical with a diameter of 20 mm (approx.)

• The coordinates (x, y) represent the spatial location and the value of the function f (x, y) is the light intensity at that point. • i(x, y) is the incident light intensity and r(x, y) is the reflectance. • We usually refer to the point (x, y) as a pixel (from picture element) and the value f (x, y) as the grayvalue (or graylevel)

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