Monday, June 24, 2013

Adding color..

Much of my time is spent with light – coaxing it to do what I need. Most often I just pop a sensor like a CCD or a CMOS in front of my beam, get the image out and get to work processing the data to reconstruct, estimate, optimize. But when we live in the world of computational imaging, combining optics and image processing, there’s no way that we can take this detector for granted. So in today’s post, it’s hats-off to the folks that made a device that enables so many things!

Bayer Color Filter Array

Light detection is a complicated, ever changing world. From projecting light temporarily on screens, to films, to digital detectors, the history of image capture has been spectacular! 

On the first day at OSA’s Imaging Congress at Arlington, VA, we saw Michael Kriss give tribute to Bryce Bayer, who is credited with the Bayer color filter – the distinctive green-red-blue-green filter pattern on sensor pixels in most digital color cameras. The choice of wavelengths, their passbands, relative proportions and arrangement that are distinctive of the Bayer pattern, were developed to enable digital cameras to emulate the tri-color vision response that we humans take so easily for granted. Since the pattern was first developed it has been used everywhere, spawning associated work on demultiplexing the colors, displaying color images, interpolating other colors based on the three captured wavelengths.. the list goes on.

With the many advances in patterning and fabrication processes, and with the explosion in the demand for images, many different filters and structures have since found their way on to sensors. People are now interested in more than RGB wavelengths. There is need for polarization imaging, IR+RGB imaging, high-dynamic range imaging, and many more modalities.

Still… the basic color image continues to be the most loved and shared medium of capturing a personal moment.

How nice would it be, to have your work reach so many across the world.. inspire more and better!

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