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Figure 142: Integration time of different bright pixels
In the diagram you can see the signal line of three different bright pixels. The slope depends of the light
intensity , thus it is per pixel the same here (granted that the light intensity is temporally constant). Given that
the very light pixel is limited soon at the signal levels S1 and S1, the whole integration time is lower
compared to the dark pixel. In practice, the parts of the integration time are very different. T1, for example, is
95% of T
total
, T2 only 4% and T3 only 1%. Thus, a high decrease of the very light pixels can be achieved.
However, if you want to divide the integration thresholds into three parts that is S2 = 2 x S1 and S3 = 3 x S1,
a hundredfold brightness of one pixel's step from S2 to S3, compared to the step from 0 and S1 is needed.
20.5 Using the HDR mode with sensor -x02d
The HDR (High Dynamic Range) mode of the sensor -x02d increases the usable contrast range. This is
achieved by dividing the integration time in three phases. The exposure time proportion of the three phases
can be set independently.
20.5.1 Functionality
To exceed the typical dynamic range, images are captured at 3 exposure times with given ratios for different
exposure times. The figure shows a multiple exposure capture using 3 different exposure times.
mvBlueLYNX-X Technical Manual
MATRIX VISION GmbH 22 April 2016 Version - 1.49 187