AP0100CS datasheet(28/73 Pages) ONSEMI

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AP0100CS HDR: Image Signal Processor (ISP)

Camera Control and Auto Functions

AP0100CS/D Rev. 6, Pub. 1/16 EN

©Semiconductor Components Industries, LLC,2016.

Auto White Balance

The AP0100CS 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

AP0100 CSAWB 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.

Exposure and White Balance Control

The Sensor Manager firmware component is responsible for controlling the application

of 'exposure' and 'white balance' within the system. This effectively means that all

control of integration times and gains (whether for exposure or white balance) is dele-

gated to the Sensor Manager. The Auto Exposure (AE) and Auto White Balance (AWB)

algorithms use services provided by the Sensor Manager to apply exposure and/or white

balance changes.

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 AP0100CS 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 AP0100CS developer guide for details.

Exposure and White Balance Modes

The AP0100CS supports auto and manual exposure and white balance modes. In addi-

tion, 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 to compensate.

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.

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