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06 nm, due t o t h e 6 0 % c r o s s t a l k t o n e i g h b o r i n g c h a n n e l s . T h i s e f f e c t w i l l be much l e s s s e v e r e f o r s i g n a l s w i t h larger linewidths. B l o o m i n g o c c u r s i n b o t h d i m e n s i o n s so t h a t i f t h e second dimension o f t h e v i d i c o n d e t e c t o r i s used f o r s p a t i a l r e s o l u t i o n , i t t o o w i l l be l i m i t e d by s i g n a l b l o o m i n g . The e f f e c t s o f b l o o m i n g a r e most s e v e r e when a weak s i g n a l o f i n t e r e s t i s o b s e r v e d n e a r an i n t e n s e s i g n a l o r when l a r g e changes i n i n t e n s i t y o c c u r o v e r s h o r t image d i s t a n c e s .

F o r l o n g s t o r a g e p e r i o d s t h e MCP m u s t a l s o be c o o l e d t o r e d u c e spontaneous photoemission. However, c o o l i n g of the photocathode w i l l reduce the red response of the photocathode. SPD. to S i g n a l storage time i s s m a l l unless the detector i s cooled below -50 °C (30-60 minutes). ; ACS Symposium Series; American Chemical Society: Washington, DC, 1983. 1. TALMI AND BUSCH Low-Light Level Applications 25 Lag SIT & I S I T . , i n c o m p l e t e r e a d o u t of s i g n a l i n a s i n g l e scan.

The e f f e c t on t h e o b s e r v e d s p e c t r u m w i l l be most s e v e r e i f t h e i n c i d e n t l i g h t p u l s e i s l o n g e r t h a n t h e g a t e w i d t h . The e f f e c t at s h o r t g a t e t i m e s c a n be m i n i m i z e d by m o d i f i c a t i o n o f t h e g a t i n g c i r c u i t (7_) o r c o m b i n i n g a n o p t i c a l g a t e , s u c h as a P o c k e l s c e l l , w i t h t h e e l e c t r o n i c g a t e o f t h e SIT v i d i c o n ( 1 8 ) . ; ACS Symposium Series; American Chemical Society: Washington, DC, 1983.

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An Image Watermarking Scheme Based on Information Theoretic Principles by Levy Merhav


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