Computers for Imagemaking by David R. Clark

By David R. Clark

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Extra resources for Computers for Imagemaking

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A p p a r e n t l y r e d o b j e c t s , for e x a m p l e , have a b s o r b e d m o r e blue a n d green light t h a n r e d light from t h e incident radiation, so t h a t t h e light reaching the eye contains a higher proportion of red wavelengths than the incident radiation. T h e mirrorl i k e o r s p e c u l a r r e f l e c t i o n s d o n o t b e h a v e i n t h i s w a y . T h e y h a v e i n s t e a d , all t h e p r o p e r t i e s o f t h e light s o u r c e . T h e e x a c t r e p r o d u c t i o n o f t h e t o t a l r e f l e c t a n c e o f a s u r f a c e is t h e c o m b i n a t i o n o f t h e s e t w o t y p e s ; m o r e o v e r , the precise forms of b o t h t h e specular a n d s c a t t e r e d c o m p o n e n t s d e p e n d s o n t h e n a t u r e of t h e surface.

B u t t h i s i m p l i e s ( a n d it is n o t d i f f i c u l t t o d e m o n s t r a t e ) t h a t u n l i k e l y o b j e c t s b e a r i n g m a r k e d similarities to highly p r o b a b l e objects are readily confused w i t h t h e m , a n d m a y be impossible t o r e c o g n i s e for w h a t t h e y a r e . F o r e x a m p l e , t h e h o l l o w m o l d ö f a face a p p e a r s w i t h its n o s e s t i c k i n g o u t — t h o u g h it is h o l l o w — a g a i n s t all m a n n e r o f t e x t u r e a n d o t h e r s e n s o r y d a t a s i m p l y b e c a u s e ä h o l l o w face is s o u n l i k e l y ( F i g .

E x p e r i m e n t s h a v e b e e n d e s i g n e d t o p r o v i d e e v i d e n c e for o r a g a i n s t a c o g n i t i v e a c c o u n t , s u c h as t h e I n a p p r o p r i a t e C o n s t a n c y Scaling T h e o r y , w h i c h r e q u i r e s t h e o r g a n i s m t o a c t o n k n o w l e d g e o r a s s u m p t i o n s o f f e a t u r e s o f t h e o b j e c t w o r l d . T h i s t h e o r y is, u n l i k e t h e a l t e r n a t i v e s m e n t i o n e d a b o v e , a c o g n i t i v e a c c o u n t b e c a u s e it s u p p o s e s t h a t t h e visual s y s t e m is a c t i n g ( c o r r e c t l y o r i n a p p r o p r i a t e l y ) f r o m s t o r e d k n o w l e d g e o f c h a r a c t e r i s t i c s o f t h e w o r l d .

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