MT9M114_16 Datasheet, PDF (31/62 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
Fade to Black Selection
The final stage of the gamma flow is the enabling and use of Fade-to-Black. The
MT9M114 IFP allows for the image to fade to black under extreme low-light conditions.
This feature enables users to optimize the performance of the sensor under low-light
conditions. It minimizes the perception of noise and artifacts while the available illumi-
nation is diminishing.
This feature has two user-set points that reference the brightness of the scene. When the
Fade-to-Black starts, it will interpolate to the end point as the light falls until it gets to the
end point. When at the end point, the image will be black.
Table 10: Fade-to-Black Selection
Variable
VAR(0x0F,0x0007) or
(R0xBC07)
VAR(0x12,0x014A) or
(R0xC94A)
VAR(0x12,0x014C) or
(R0xC94C)
VAR(0x0F,0x003A) or
(R0xBC3A)
Name
ll_mode
Function
When bit 3=1, this will enable the Fade-to-Black feature
cam_ll_start_fade_to_black_luma _{Starting point for Fade-to-Black to begin}
cam_ll_stop_fade_to_black_luma _{End point for Fade-to-Black, after this point the image will be black}
ll_average_luma_fade_to_black Measure of scene brightness, reference points for
cam_ll_start_fade_to_black_luma and
cam_ll_stop_fade_to_black_luma
ON Semiconductor would recommend that cam_ll_start_fade_to_black_luma is set at 3
lux and cam_ll_stop_fade_to_black_luma is set at 1 lux, but due to the flexibility of the
MT9M114 it is at the discretion of the user.
MT9M114/D Rev. 11, 2/16 EN
31
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