AP0101CS datasheet(22/42 Pages) ONSEMI

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AP0101CS/D Rev. 7, 1/16 EN

©Semiconductor Components Industries, LLC,2016.

AP0101CS HDR: Image Signal Processor (ISP)

Auto White Balance

The AP0101CS 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 IFP 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

AP0101CS AWB displays the current AWB position in color temperature, the range of

which will be defined when programming the CCM matrixes.

The region of interest can be controlled through the combination of an inclusion

window and an exclusion window.

Dual Band IRCF

For some applications a day/night filter would be switched in/out, this option is an

additional cost to the camera system. The AP0101CS supports the use of dual band IRCF,

which removes the need for the switching day/night filter. Tuning support is provided

for this usage case. Refer to the AP0101CS developer guide for details.

Exposure and White Balance Modes

AP0101CS supports auto and manual exposure and white balance modes. In addition, it

will operate within synchronized multi-camera systems. In this use case, one camera

within the system will be the 'master', and the others 'slaves'. The master is used to

calculate the appropriate exposure and white balance. This is then applied to all slaves

concurrently under host control.

Auto Mode

In Auto Exposure mode the AE algorithm is responsible for calculating the appropriate

exposure to keep the desired scene brightness, and for applying the exposure to the

underlying hardware. In Auto White Balance mode the AWB algorithm is responsible for

calculating the color temperature of the scene and applying the appropriate red and

blue gains.

Triggered Auto mode

The Triggered Auto Exposure and Triggered Auto White Balance modes are intended for

the multi-camera use cases, where a host is controlling the exposure and white balance

of a number of cameras. The idea is that one camera is in triggered-auto mode (the

master), and the others in host-controlled mode (slaves). The master camera must

calculate the exposure and gains, the host then copies this to the slaves, and all changes

are then applied at the same time.

Manual Mode

Manual mode is intended to allow simple manual exposure and white balance control

by the host. The host needs to set the CAM_AET_EXPOSURE_TIME_MS, CAM_AET_EX-

POSURE_GAIN and CAM_AWB_COLOR_TEMPERATURE controls, the camera will

calculate the appropriate integration times and gains.

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