Question
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What's the advantage of a Camara with Bayer Encoding compared to a Camera with RGB output for Colour Images?
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Answer
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The so-called Bayer-cameras have a single CCD with an integrated Bayer mosaic filter. There are a number of reasons for having a single chip Colour camera with a Bayer output:
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lower data rate if only grayscale images are transferred into the computer
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larger selection of (in almost all cases cheaper) lenses when using only one CCD sensor instead of an RGB prism with 3 CCDs as in 3 CCD cameras
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fewer absorption losses in comparison to 3 CCD cameras that loose some light due to absorption in the prism
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prices: 3 CCD cameras are significantly more expensive than 1 CCD cameras
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In many cases (e. g. Jai CV-M7) the camera outputs raw grayscale Bayer data which afterwards needs to be decoded into the RGB colour information by means of a software such as the CVB BayerToRGB tool.
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However there are also cameras (such as the Jai CV-M70 and Jai CV-M77) that have an internal DSP which produces the RGB information in the camera and delivers analog RGB signals.
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| Of course this interpolation in most cases introduces artifacts into the image (which is naturally, because the full RGB information is not present for a pixel but taken from its neighbourhood). However for most applications these artifacts are not so severe and are outweighed by the above advantages of Bayer cameras. |
