SU320CSX
4110-0446, Rev. C
Page 51 of 96
© 2017 UTC
Aerospace Systems
Date Printed: 3-Jan-2017
This document does not contain any export controlled technical data.
5.10.
Image Enhancement Commands
The image enhancement algorithm of the CSX, when enabled, performs an enhancement on each pixel of
the frame to produce a higher contrast image for display. The enhancement look-up table for each frame
is computed using the previous frame’s statistics. The frame statistics used to determine the enhancement
look-up table are based on a histogram of the frame’s pixels, e.g., the distribution of the frame’s pixel
values. The enhancement look-up table is generated from the collected histogram by a proprietary
enhancement algorithm. By applying this enhancement algorithm, the pixel data will be stretched over the
available pixel bit depth resulting in a higher contrast scene for display.
When the camera is in the state ENH:AUTO ON (default), enhancements will be automatically controlled
by the camera. To manually control the enhancements the command ENH:AUTO OFF should be sent and
the ENH:POWER command should be used to adjust the image. The ENH:POWER function will only
affect the data when ENH:AUTO is OFF and ENH:ENABLE is ON.
An ENH:POWER decimal value of less than 1
will shape the look-up table in a manner similar to the
green line shown in the Figure. The slope of the curve is greater for the lower input values and will stretch
the lower intensity data over a larger portion of the output, resulting in more shadow detail in the image at
the expense of reducing contrast in the brighter areas of the scene.
An ENH:POWER decimal value of greater than 1
will shape the look-up table in a manner similar to
the blue line shown in the Figure. The slope of the curve is greater for the higher input values and will
stretch the higher intensity data over a larger portion of the output, resulting in more detail in the brighter
areas of the image at the expense of reducing contrast in the lower signal (shadow) areas of the scene.
An ENH:POWER decimal value of 1
will shape the look-up table in a manner similar to the black line
shown in the Figure. The slope of the curve is constant for the input values and will result in an image
where the bright and dark areas of the scene are evenly weighed.
5.10.1.
Set Enhancement State
Description
Sets the state of the image enhancement algorithm.
Figure 13 Example of enhancement algorithm effect on frame histogram.
