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DRAGSTER
CONFIDENTIAL
Prevent any light of getting to the sensor by switching off the light and placing a black cap over
it.
Make a “Send All” of the default settings with DragsterComm. First we'll make a rough tuning
so that all segments show a histogram over 0. Once this is achieved a fine tuning of the individual
black levels has to be made so all histograms overlap and look like a single one.
Activate the image histogram. If it is clamped to zero, decrease the black level in “All
segments” and send this register. If both segments are far away from zero, increase the black level until
one of the histograms start getting close to 0.
After this the histogram should look like this:
Now the fine tuning has to adjust the higher histogram to go over the other. For this we need to
identify which of them is the higher one. By setting a black level ± 10 of what was set in the Black
level All Segments it should be easy to identify it.
Note: To set the black level of individual segments use only the 4K_1 SPI and 8K_1 SPI.
After the fine calibration, the black level should look like this:
DATE:
25/06/09
DRAGSTER Evaluation
Version 0.0.04
PAGE:
3/6
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Figure 2: Initial black level
