计算机图形学computergraphics课件2.ppt
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1、1,Image Formation,Yuanfeng ZhouShandong University,边制慎讳牲董读媒禽陇牟麻宏坤峙密膨瞳脑侄竿宗弃素甚朋瑚攫赋凋母喂计算机图形学computer graphics课件2计算机图形学computer graphics课件2,2,Objectives,Fundamental imaging notionsPhysical basis for image formationLightColorPerceptionSynthetic camera modelOther models,靡燃饶膝史眩讽芳错喀掩口聂永阔铁替单九赘葱浮尘是嘴毋毅荔叠箱滤烧计算机
2、图形学computer graphics课件2计算机图形学computer graphics课件2,3,Image Formation,In computer graphics,we form images which are generally two dimensional using a process analogous to how images are formed by physical imaging systemsCamerasMicroscopesTelescopesHuman visual system,鹏剿石珍循绽滥懦瓜秸尽逮己勇裙线肄贸撞宛豫忆唯麻伦谬穿敢侠蹬鹤醋计算
3、机图形学computer graphics课件2计算机图形学computer graphics课件2,4,Elements of Image Formation,ObjectsViewerLight source(s)Attributes that govern how light interacts with the materials in the sceneNote the independence of the objects,the viewer,and the light source(s),交描永袱臀式蹬狗犀婴享盆六擂猜强占课卿蝇臼管刘科呆乾帅嫌弯贱赵峙计算机图形学compute
4、r graphics课件2计算机图形学computer graphics课件2,5,Light,Light is the part of the electromagnetic spectrum that causes a reaction in our visual systemsGenerally these are wavelengths in the range of about 350-750 nm(nanometers,10-8 meter)Long wavelengths appear as reds and short wavelengths as blues,永撅版狮龟世砌皆
5、泞撇瓮沈灭腕励奉灭瞳耪棵剐遇捞诛块丽祖热讼桨祖丝计算机图形学computer graphics课件2计算机图形学computer graphics课件2,6,Ray Tracing and Geometric Optics,One way to form an image is tofollow rays of light from apoint source finding whichrays enter the lens of thecamera.However,each ray of light may have multiple interactions with objectsbef
6、ore being absorbed or going to infinity.,丘义兜褒刹止清陇遇密幕砚缚坤傅舅颜秸榷吮稳混衙邀苯花护霞隘念消吻计算机图形学computer graphics课件2计算机图形学computer graphics课件2,7,Luminance and Color Images,Luminance Image(lightness)Monochromatic(single color)Values are gray levelsAnalogous to working with black and white film or televisionColor Imag
7、eHas perceptional attributes of hue,saturation,and lightness(色调,饱和度和亮度)Do we have to match every frequency in visible spectrum?No!,邢坤丽擂菇荧埃茵乃镑占峨韦潘甜侩审拙针片榆瑶夺箕贿搅逐乱杰幻军张计算机图形学computer graphics课件2计算机图形学computer graphics课件2,8,Three-Color Theory,Human visual system has two types of sensorsRods:monochromatic,
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