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ece542-2 - ECE542-2 Digital Image Processing 2 Digital...

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1 ECE542-2 Digital Image Processing 2- Digital image Fundamentals Digital image Fundamentals Dr. Z. Aliyazicioglu Cal Poly Pomona Electrical & Computer Engineering 1 Cal Poly Pomona Electrical & Computer Engineering Office 9-143 Elements of Visual Perception Human analysis play a central role in choice of image processing techniques based on visual judgments. Learning the physical limitation of human vision Structure of Human Eye Eye is nearly a sphere Average diameter is 20 mm Three membranes enclose the eye The Cornea and Sclera ECE542-2 2 Cal Poly Pomona The Choroid The Retina
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2 Structure of Human Eye The Choroid Contains network of blood vessels that serve nutrition to eye. The choroid coat reduce the amount of extraneous light entering the eye Its exterior extreme is divided into the ciliary body and the iris. The lens is made up of concentric layer of fibrous cells. contains 60 to 70% water, about 6% fat and more protein It is colored by slightly yellow pigmentation. Absorbs approximately 8% of the visible light spectrum. ECE542-2 3 Cal Poly Pomona Higher absorption at shorter wavelength. Infrared and ultraviolet light can damage the eye Structure of Human Eye The retina Lines inside of the wall’s entire posterior portion When eye is properly focused, light from on object outside the eye i i d th ti is imaged on the retina Two classes of receptors Cones 6 to 7 million cones in each eye Located central portion of the retina called the fovea Each one connected its oven nerve end Rods 70 to 150 million are distributed over the retina ECE542-2 4 Cal Poly Pomona Several rods are connected to a single nerve Gives overall picture of the field of view. Not involved in color vision
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