[QuadList] Image Orthicon physics (was Early Quad Color--"Saving Cyd Charisse"...)

[Ted Langdell]

Here's a poop sheet on an RCA 5820, describing its principles of  
operation:
http://www.cs.cmu.edu/~sensing-sensors/S2009/pix_etc/Image_Orthicon-5820.pdf

The Halo effect is explained here:
http://en.wikipedia.org/wiki/Video_camera_tube#Dark_halo

The lack of the built-in edge enhancement is what prompted CBS Labs to  
develop the image enhancer/edge enhancer/contour detail system which  
it used with   the network's Norelco PC-60/70 cameras.

Ted


On Aug 12, 2010, at 5:34 AM, Dennis Degan wrote:

>
> 		On Aug 11, 2010, at 10:12 PM, Dale Lamm wrote:
>
> > Somewhere I read that the Orthicon's halo was due to a surplus of  
> electrons coming off the target due to a bright part of the scene  
> and being drawn to
> surrounding areas.
>
> 		I agree:
>
> 	Yes, the electrons would 'bounce' off the target and land  
> elsewhere, causing the halo's glow around those bright areas.
>
> 			Dennis Degan, Video Editor-Consultant-Knowledge Bank
> 	  					NBC Today Show, New York
>

Ted Langdell
Secretary