MT9M114_16 Datasheet, PDF (37/62 Pages) ON Semiconductor – High-Definition (HD) System-On- A-Chip (SOC) Digital Image Sensor

MT9M114: 1/6-Inch 720p High-Definition (HD) System-On-A-Chip (SOC) Dig-
ital Image Sensor
Dark Background
Average Brightness Tracking or Average Y
Weighted Average Brightnes s(centre)
Adaptive weighted based on zone luma (highlights) Adaptive weighted based on zone luma (lowlights)
Note: This mode is
correctly exposing the
background of the
image, hence you can
see the shadows.
AE Track Driver
In this use case the Adaptive Weighted AE for highlights will expose the face the best
when compared to the other options.
Other algorithm features include the rejection of fast fluctuations in illumination (time
averaging), control of speed of response, and control of the sensitivity to the small
changes. While the default settings are adequate in most situations, the user can
program target brightness, measurement window, and other parameters described
above.
The driver changes AE parameters (integration time, gains, and so on) to drive scene
brightness to the programmable target.
To avoid unwanted reaction of AE on small fluctuations of scene brightness or momen-
tary scene changes, the AE track driver uses a temporal filter for luma and a threshold
around the AE luma target. The driver changes AE parameters only if the filtered luma is
larger than the AE target step and pushes the luma beyond the threshold.
MT9M114/D Rev. 11, 2/16 EN
37
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