1ECE542-2Digital Image Processing2- Digital image FundamentalsDigital image FundamentalsDr. Z. AliyaziciogluCal Poly PomonaElectrical & Computer Engineering1Cal Poly PomonaElectrical & Computer EngineeringOffice 9-143Elements of Visual PerceptionHuman analysis play a central role in choice of image processing techniques based on visual judgments.Learning the physical limitation of human visionStructure of Human EyeEye is nearly a sphereAverage diameter is 20 mmThree membranes enclose the eyeThe Cornea and ScleraECE542-2 2Cal Poly PomonaThe ChoroidThe Retina
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2Structure of Human EyeThe Choroid Contains network of blood vessels that serve nutrition to eye. The choroid coat reduce the amount of extraneous light entering the eyeIts 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 proteinIt is colored by slightly yellow pigmentation.Absorbs approximately 8% of the visible light spectrum. ECE542-2 3Cal Poly PomonaHigher absorption at shorter wavelength. Infrared and ultraviolet light can damage the eyeStructure of Human EyeThe retinaLines inside of the wall’s entire posterior portionWhen eye is properly focused, light from on object outside the eye i idthtiis imaged on the retinaTwo classes of receptorsCones6 to 7 million cones in each eyeLocated central portion of the retina called the foveaEach one connected its oven nerve endRods70 to 150 million are distributed over the retinaECE542-2 4Cal Poly PomonaSeveral rods are connected to a single nerveGives overall picture of the field of view. Not involved in color vision