Table 10: Image Enhancement Dynamic Adaptive Contrast Examples - Dalsa Calibir GXM640 User Manual

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Table 10: Image Enhancement Dynamic Adaptive Contrast Examples

Image 8-bit image histogram
Average value = 128.95; Standard Deviation = 8.32
Contrast = 1 (low contrast)
Average value = 128.06; Standard Deviation = 40.99
Contrast = 128 (normal contrast)
Average value = 123.68; Standard Deviation = 118.46
Contrast = 255 (high contrast)
Maximum Gain
The maximum gain feature is used when the Contrast Mode (contrastMode) feature is
set to Dynamic Adaptive (AdaptiveDynamic). This feature only applies when the 16-bit
image has low contrast (image range is less than 255 DN). The maximum gain setting
determines the smallest range of 16-bit values (around the average value) that can be
stretched to fit 8-bits (0-255). For example, if a maximum gain of 10 is applied, a range
of at least 25 pixel values are mapped to 8-bit values. A maximum gain of 1 limits the
window of 16-bit values around the average to 256, while a gain of 0.5 limits the range
to 512 values.
52  Features and Configuration Options Calibir GXM640 IR Camera User's Manual