Page no. 16 | Appendix No. 1
6.3.6
ExposureAuto & GainAuto ROI Definition
ROI definition refers to Region of Interest which will be used for brightness calculations. The ROI Offset X
and Offset Y refer to the distance of the ROI from top left corner of sensor area. Please see section 10.5
of appendix no. 1 for more information
6.3.7
Exposure Time
Time in microseconds [µsec] in which sensor is exposed to light. This time is subject to the specified image
frame rate:
minimum exposure ≅ 1
maximum exposure ≅
1,000,000
frame rate
Additional delays might be taken to consideration in calculation of exposure values, like delay between
frames, etc.
6.3.8
LUT Control
The LUT Control can be used to re-map the camera linear output in different manner. Mostly to
compensate for the non-linear scene emission. Each index at the LUT corresponds to the pixel value and
the LUT value at this index corresponds to the value that the pixels should be re-mapped to.
P
red
(x, y) = LUT
red
[P
red
(x, y)]
P
green
(x, y) = LUT
green
[P
green
(x, y)]
P
blue
(x, y) = LUT
blue
[P
blue
(x, y)]
Where P(x,y) is the pixel at offset X in horizontal and Y in vertical, of specific color.
6.3.9
Sub Sampling
The Sub-Sampling function allows the user to compress the data received from the imaging sensor by
sampling every other pixel in both the X and Y axis, turning every group of 2x2 pixels into a single pixel and
quartering the image resolution.
Figure 1 – Subsampling example
