The Art of Image Processing: Digital camera processing by Bore Chris

Author:Bore, Chris [Bore, Chris]
Language: eng
Format: epub
Tags: Image Processing
Publisher: BORES Signal Processing
Published: 2014-10-01T21:00:00+00:00

Charge leakage is most likely to happen if one sensor's charge storage cell is saturated and its neighbor is not at all: that is, if an image shows a very bright object against a dark one. So cells near a bright pixel may become bright too. This effect is called ‘blooming’.

Not all blooming is caused by image sensors: for instance the moon seen through light mist in fact does show blooming which is real. And blooming may be caused by the optical effects of a lens (which is why we pay extra to have ‘anti-bloom’ coatings on camera lenses and spectacles).

Blooming is often said to be characteristic of CCD sensors and not of CMOS sensors, but in fact it affects both. CMOS sensors are said to be ‘immune’ from blooming only because they have ‘anti-bloom’ transistors built in, that drain the charge to some harmless place before the pixel saturates. But CCD sensors also have anti-bloom feature: for instance drain channels running alongside the sensors – when the sensor charge gets too high it slops over into the drainage channel and drains off harmlessly.

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