5 –Camera Controller
A6000 and A8500 Series User’s Manual
57
The Manual Linear algorithm evenly distributes the grayscale values over the digital values. This
works fairly well if the image dynamic range is fairly evenly distributed but in general does not produce
high contrast imagery, but it also does not saturate or clip the hot and cold regions either. The
Plateau Equalization algorithm (also called PE) is a nonlinear AGC algorithm that uses the image
histogram to optimally map the 256 gray scales. This algorithm works well for most scenes, but it
works best when the scene has a “bi-modal” distribution (two clumps). It usually the most popular
because algorithm because it produces high contrast (but more saturated) video. The following
pictures illustrate the differences in AGC algorithms. (The data was captured from the digital output,
but the effect is similar for the analog side.)
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