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Digital photography tutorials – Bayer demosaicing

The next step in the series of digital photography tutorials is an extension of understanding camera sensors, and explains about Bayer demosaicing.

Bayer demosaicing is basically a process of converting the Bayer array of primary colors into the final product, i.e., an image that has full color detail on every pixel. While this might seem like a fairly impossible task, the way to understanding how this works is by considering each array (2X2) of red, green and blue as a full color cavity.

A majority of the modern age cameras take even more steps to extract greater image information from this array, i.e., if a camera treats all colors in the 2X2 array as landing at the same spot, only half of the resolution would be properly extracted in the horizontal as well as vertical directions. However, if the color is determined using multiple overlapping arrays, a higher resolution would be achieved as compared to the former case, where only a single set of array was being taken.

However, a point to note here is that image information at the end of the arrays is not calculated, since there is always an assumption that the image continues in each direction. But in case the array(s) in consideration are actually the edges of the cavity array, the calculations would certainly be less accurate, as there are no pixels on all sides. However, one can easily crop out information that is gathered from the edges of pixels.

A special case can be of images that have small-scale detail near the resolution limit of the camera's digital sensor, as they have the tendency of rendering the demosaicing algorithm ineffective, and result in an unrealistic image. The most common artifact in this regard is moiré, which could appear as repeating patterns, pixel arranges or color artifacts.

About the Author

John Hussain is a renowned digital photographer. He has travelled across 3 continents on photography assignments, and is currently a prominent authority on digital photography. For More Information Visit digital photography tutorials.

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