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Kodak reinvents the pixilated wheel

Posted February 06, 2008 11:36 AM

From Coolest Gadgets:

Since digital cameras surpassed the sweet spot threshold of six megapixels, camera makers have been involved in an arms race over the misguided belief that more megapixels are better. Trouble is that unless designers increase the size of the chips, all those extra megapixels are good for is more noise, especially at ISO settings above 800. So what does one do if one can't enlarge the CCD chips in a compact point and shoot? Kodak thinks the idea is to reinvent the pixilated wheel. The result is the Kodak KAC-05020 Image Sensor. Here's how it works. Rather than rely on the tried and true design of red, green and blue pixel pattern (also known as the Bayer Sensor Pattern) Kodak's design adds panchromatic pixels to the red, green and blue grid. The result is more light sensitivity. In addition, the new CMOS approach looks at the absence of light creating electrons, rather than counting what electrons are created. The result promises to be lower noise levels, greater sensitivity and better quality digital images at higher ISOs. If the technology pays off, it could be the breaking of the digital still light/noise barrier equivalent to the sound barrier being broken in 1947 by Chuck Yeager. And it could leader to far better digital cameras in the point and shoot realm, which currently suffers from megapixel envy and a lack of light sensivity.

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Join Date: Apr 2007
Posts: 3531
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Re: Kodak reinvents the pixilated wheel

02/07/2008 4:11 PM

I'd say it was a slightly different take on a method already employed by Fuji.

Historically, television transmission systems relied on the fact that colour-discrimination resolution is much lower than intensity resolution. Similarly, for several years now, some of Fuji's cameras have taken advantage of this by using 'white' cells surrounded by smaller colour cells.

I think the following theoretical possibility might be interesting** - it could work for cameras that never need to operate at Numerical Aperture below about 2, giving them the same sensitivity as traditional methods would provide at 1.7 times smaller NA.
. The method would be to split the colours and refocus instead of using absorbers.
Whether this could ever be made practical is another matter.

**Intellectually satisfying, at least

N.B. Looking at Kodak's pattern, I'm somewhat mystified why they don't interleave the colours more evenly. I suppose it doesn't make a great deal of difference for most amateur pictures, but it would be significant if you wanted to use it for serious work (especially microscopy, where it's often worth enlarging the picture beyond the point where lack of resolution is noticeable). Could Kodak be trying to avoid a competitor's patent?

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