AS0260CSSC28SUD20 datasheet(54/83 Pages) ONSEMI

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AS0260 DS Rev. G Pub. 5/15 EN

©Semiconductor Components Industries, LLC, 2015.

AS0260: 1/6-Inch 1080P High-Definition (HD) System-On-A-Chip (SOC) Digi-

tal Image Sensor

The AS0260 does not maintain coherency between UVC_BRIGHTNESS_CONTROL and

CAM_AET_TARGET_AVG_LUMA. Issue a Refresh command to force coherency.

Contrast

The AS0260 supports a brightness-dependent contrast control, exposed through the

Camcontrol interface. The actual amount of contrast applied (each frame) is dependent

upon the estimated brightness of the scene. This allows the AS0260 to adapt to various

scene lighting conditions.

The Camcontrol interface provides two contrast settings; one for bright scenes - the

'contrast enhancement' setting, and one for dark scenes - the 'noise reduction' setting.

The AS0260 calculates a 'brightness-metric' each frame - this represents the estimated

brightness of the scene (note the metric is inverse - the smaller the metric, the brighter

the scene). The CAM Control interface supports contrast 'start' and 'stop' controls

(specified in brightness-metric units) which indicate the knee points for the brightness-

dependent contrast.

As shown in Figure 31, if the brightness-metric is below the start point, the Lowlight

algorithm applies the 'contrast enhancement' setting. If the metric is above the stop

point, the 'noise-reduction' setting is applied. If the metric is between the two points,

the Lowlight algorithm calculates the applied contrast by linear interpolation between

the 'contrast enhancement' and 'noise-reduction' settings, proportional to the bright-

ness-metric.

Figure 31:

Brightness-Dependent Contrast Control

The UVC contrast variable controls both the 'contrast enhancement' and 'noise-reduc-

tion' contrast settings. The 'contrast enhancement' value is set directly by UVC contrast.

The 'noise-reduction' value is set proportionally according to the ratio between the CAM

'contrast enhancement' and 'noise-reduction' contrast variable settings.

Variable

Name

Type

Default

R0xCC0C

VAR(0x13,0x000C)

UVC_CONTRAST_CONTROL

UINT16

UFIXED5

32 (contrast gradient of

1.0)

Contrast

Brightness

-Metric

Contrast

Enhancement

Noise-

Reduction

Start

Stop

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