MT9M114 Datasheet, PDF (40/66 Pages) ON Semiconductor – Digital Image Sensor

MT9M114: 1/6-Inch 720p High-Definition (HD) System-On-A-Chip (SOC) Dig-
ital Image Sensor
Auto White Balance
Flicker Avoidance
The MT9M114 has a built-in AWB algorithm designed to compensate for the effects of
changing spectra of the scene illumination on the quality of the color rendition. The
algorithm consists of two major parts: a measurement engine performing statistical
analysis of the image and a driver performing the selection of the optimal color correc-
tion matrix and SOC digital gain. While default settings of these algorithms are adequate
in most situations, the user can reprogram base color correction matrices, place limits
on color channel gains, and control the speed of both matrix and gain adjustments. The
MT9M114 AWB displays the current AWB position in color temperature, the range of
which will be defined when programming the CCM matrixes.
Flicker occurs when the integration time is not an integer multiple of the period of the
light intensity. The MT9M114 can be programmed to avoid flicker for 50 or 60 Hertz. For
integration times below the light intensity period (10ms for 50Hz environment), flicker
cannot be avoided. The MT9M114 supports an indoor AE mode, that will ensure
flicker-free operation (VAR8= 18, 0x0078[0]=0x1 o REG= 0xC878[0]= 0x1). The MT9M114
will calculate all flicker parameters based on the sensor settings which are programmed
in the Cam Control variables. This means the user only needs to select if 50- or 60-Hz
flicker needs to be avoided (VAR 0x12, 0x008B or R0xC88B = 50 for 50-Hz flicker avoid-
ance and 60 for 60-Hz avoidance).
MT9M114 DS Rev. J Pub. 4/15 EN
40
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