User`s manual
Genie HM-HC Series-GigE Vision Camera Sapera CamExpert Guide 101
Click the Auto White Balance button to have CamExpert adjust the RGB gain to achieve a realistic color cast
under the current lighting conditions. The auto white balance function should be executed again when lighting
conditions or color temperature change.
The CamExpert auto white function can work on a smaller ROI. Within the CamExpert acquisition window,
click and drag a ROI rectangle with the left mouse button. Having a ROI of an evenly illuminated non-saturated
image of a white or light gray surface may produce superior results.
The independent RGB gain controls, expressed in decibels (dB), range from 0db to 12db. These are used for
manual white balance adjustments or specialty needs.
Individual RGB gains are multiplied by the overall Gain adjustment.
The Gamma Factor sets the value for the exponent of the gamma correction curve. Gamma correction is used to
adjust the color response when displaying images on a monitor. Monitors typically do not have a linear
response (Gamme Factor = 1), therefore it is recommended that you experiment with gamma values for your
particular display. In general, a value less than 1 will be used to enhance contrast in dark pixels, where typical
values are between 0.5 and 1.
Bayer Conversion Algorithms
The conversion algorithms available are provided from the Sapera LT SapBayer class. The following Bayer
conversion algorithms are available:
Method1: Technique based on bilinear interpolation. Fast, but tends to smooth the edges of the image. Based on
a 3x3 neighborhood operation.
Method2: Proprietary adaptive technique, better for preserving the edges of the image. However, it works well
only when the image has a strong content in green. Otherwise, little amounts of noise may be visible within
objects.
Method3: Proprietary adaptive technique, almost as good as Method2 for preserving the edges, but independent
of the image content in green. Small color artifacts of 1 pixel may be visible at the edges.