#1
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Idea: CCD colour conversion to tube B&W cameras
G'day all.
A little while ago I posted an experiment of mine which was to take two video stills of a subject using a vidicon B&W camera and CCD colour camera and superimpose them over each other to create a colour image with vidicon luminance and CCD chroma which can be viewed here http://videokarma.org/showthread.php?t=251215 . And I briefly talked about this being fron the idea of converting a B&W tube camera to colour using this method. I have now expanded this tube/CCD colour camera idea of mine and have made a page on my site illustrating it in greater detail http://www.troysvintagevideo.741.com/tubeccdcolour.html . I also have been thinking it would also be good to make the converted tube camera be interswitchable between 3 modes for versatility of use which are: 1: tube on, CCD on (luminance attenuated) for tube/CCD colour 2: tube on, CCD off for original tube B&W 3: tube off, CCD on (with normal luminance) for modern CCD colour Anyways I have followed it up the tube/CCD idea with some diagram layouts of 3 general tube type cameras, the iconoscope, the image orthicon and the vidicon. The layout consists of a B&W tube, a colour CCD, a prism beam splitter to split the light to both image pickup devices and lenses and mirrors in between. I basically took the diagram of Fernseh's colour camera design consiting of a 3" IO and a colour striped vidicon from this page http://www.fernsehmuseum.info/fese-kc-33.html and have adapted the design as a basic platform to work off for my tube/CCD camera idea. I am not sure of what optical setup would be needed for the CCD so I left the the optic layout the same as the original, same thing for the colour matrixing method even though I think the green won't be accurately derived from the YRB when Y is a tube and RB is CCD. I admit I don't know how practical or impractical this idea is but thought I'd put it out anyhow. I hope to somehow get the knowhow to put it into practice and either build a tube/CCD camera or modify a B&W tube camera with CCD and make it work! If anyone wants to put this idea into practice they are welcome and I totally encourage it! Anyways here attached is a few diagrams of a tube/CCD colour layout which are for iconoscope, image orthicon and vidicon, these are featured on my page.
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AUSSIE AUSSIE AUSSIE!!!!! OI OI OI!!!!! |
#2
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I think this is basically doable. The major stumbling block seems to be the distance from the lens to the imaging devices, which I think will probably require some sort of relay optics like that used in the TK-41.
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#3
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Last edited by site123a; 11-18-2014 at 01:06 PM. |
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Last edited by site123a; 11-18-2014 at 01:06 PM. |
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Quote:
__________________
AUSSIE AUSSIE AUSSIE!!!!! OI OI OI!!!!! |
Audiokarma |
#6
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I would caution against using only R and B from the CCD. The reason is that any imbalance between G (derived from the tube) and R and B (from the CCD) will result in a green or magenta cast, which is the most objectionable of color shifts. If you develop only Y from the tube, and color difference signals from the CCD RGB, then mismatches will show only as an error in color saturation - much more tolerable.
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#7
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Last edited by site123a; 11-18-2014 at 01:06 PM. |
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