Friday, April 18, 2008

Multiple Sensors In Digital Cameras

Almost all Digital Single Lens Reflex cameras use Bayer filter to allow monochrome sensor to re-create color.

But Bayer filter softens image and induces moire.

So how can one: A) increase resolution; B) increase low-light sensitivity; C) improve color accuracy.

Kodak patented a new Bayer filter that is said to improve low-light performance without affecting color accuracy or reducing resolution.

Let's take a look at how the video camera industry does it.

Professional and not quite professional (A.K.A., pro-sumer) use 3 imaging sensor. Incoming light is split by a prism into 3 individual color (RGB) and an imaging sensor sits at the end of the prism without color filters.

But a prism assembly is not practical in a DSLR, quite simply: there is no space.

So I am wondering if it would be possible to install 4 inexpensive (relatively) imaging sensor from Point & Shot digital cameras.

Arranged in a square on the focus plane.

Each imaging sensor will have either one of Red-Green-Blue-Clear filter.

No idea if it works.

What works is the beam splitter prism used in multi-imaging sensor video cameras.

But how to fit it in DLSR body?

Here are 3 ways:

A) You do not even try. Go away.

B) Take out the mirror and the optical viewfinder (HERESY!)

C) Adopt video camera format.

Personally I prefer another option: separate the lens/sensor housing from the display/processing/storage and tether both with a high speed cable or, better yet..., wireless link. Nothing about it is rocket science. Just a 'paradigm' shift is needed.

Paparazzi should love it.

Imagine attaching your lens/sensor body on a monopod and hoisting it up and over the heads of milling crowds and security goons while being able to zoom, focus, shoot with the display/processing/storage body.

Or placing your lens/sensor low on the ground and camouflaged while you control it wirelessly and taking snaps upskirts and.... uhurmmm...

Back to topic.

I remember in the early days of portable consumer video recording (*GAH !* I AM OLD !!!) the sensor/lens/viewfinder was separate from the recording module (essentially a portable VCR).

So a detached lens/multi-sensor body/pod/assembly wired/wireless link to a large high resolution LCD monitor/multi-processor/high capacity SSD or disk drive/high capacity battery seems like a good idea.

And... if the photgrapher can afford it: each lens gets it's own sensor body. How's that for a quick lens swap?

Of course the camera thingy will also offer video recording.

Naturally.