1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 2<HTML> 3<HEAD> 4<META http-equiv="Content-Type" content="text/html; charset=windows-1252"> 5<META name="GENERATOR" content="IBM WebSphere Studio Homepage Builder Version 7.0.0.0 for Windows"> 6<META http-equiv="Content-Style-Type" content="text/css"> 7<TITLE>CAMERA_I2CAutoExposure*</TITLE> 8<LINK rel="stylesheet" href="../css/nitro.css" type="text/css"> 9</HEAD> 10<BODY> 11<H1 align="left">CAMERA_I2CAutoExposure* <IMG src="../image/TWL.gif" align="middle"></H1> 12<H2>Syntax</H2> 13<DL> 14 <DD> 15<CODE>#include <twl/camera.h></CODE><BR> <BR> <CODE><A href="CAMERAResult.html">CAMERAResult</A> CAMERA_I2CAutoExposure(<A href="CAMERASelect.html">CAMERASelect</A> camera, BOOL on);</CODE> <BR> <CODE><A href="CAMERAResult.html">CAMERAResult</A> CAMERA_I2CAutoExposureAsync(<A href="CAMERASelect.html">CAMERASelect</A> camera, BOOL on, <A href="CAMERACallback.html">CAMERACallback</A> callback, void *arg);</CODE> 16</DL> 17<H2>Arguments</H2> 18<TABLE border="1" width="100%"> 19 <TBODY> 20 <TR> 21<TD width="13%"><EM><STRONG>camera</STRONG></EM></TD> 22<TD width="87%">Camera to configure (<CODE>CAMERA_SELECT_IN</CODE>, <CODE>CAMERA_SELECT_OUT</CODE>, or <CODE>CAMERA_SELECT_BOTH</CODE>).</TD> 23 </TR> 24 <TR> 25<TD width="13%"><EM><STRONG>on</STRONG></EM></TD> 26<TD width="87%">When <CODE>TRUE</CODE>, enables the automatic exposure feature.</TD> 27 </TR> 28 <TR> 29<TD width="13%"><EM><STRONG>callback</STRONG></EM></TD> 30<TD width="87%">Function that is called when asynchronous processing has completed.</TD> 31 </TR> 32 <TR> 33<TD width="13%"><EM><STRONG>arg</STRONG></EM></TD> 34<TD width="87%">Arguments when the callback function is invoked.</TD> 35 </TR> 36 </TBODY> 37</TABLE> 38 39<H2>Return Values</H2> 40<P>Returns <CODE>CAMERA_RESULT_SUCCESS</CODE> if configuration was successful.</P> 41 42<H2>Description</H2> 43<P> 44Enables or disables the camera's automatic exposure feature. We recommend enabling this when the camera is started because the exposure value is undefined immediately after the camera has been started with the <a href="CAMERA_I2CActivate.html"><CODE>CAMERA_I2CActivate</CODE></a> function.<BR><BR> Unlike <code>CAMERA_I2CAutoExposure</code>, the <code>CAMERA_I2CAutoExposureAsync</code> function returns control immediately and runs asynchronously. Use <SPAN class="argument">callback</SPAN> to confirm that processing has completed.<br><br> <font color="red"><B>Note:</B></font><br> If camera settings are changed using any of the <code>CAMERA_I2C*</code> functions, the changes may be delayed for approximately one frame before they are applied. Consequently, note that if camera settings are changed while capturing, the application may not be able to get an updated image (an image with changes applied) at the time the application intended. 45</P> 46 47<H2>See Also</H2> 48<P><A href="CAMERASelect.html"><CODE>CAMERASelect</CODE></A><BR> <A href="CAMERACallback.html"><CODE>CAMERACallback</CODE></A><BR> <A href="CAMERAResult.html"><CODE>CAMERAResult</CODE></A></P> 49<H2>Revision History</H2> 50<P> 512009/03/25 Added a note on changes to camera settings during capture operations. <br>2008/10/30 Noted that <CODE>CAMERA_SELECT_BOTH</CODE> can also be specified. <br>2008/07/16 Initial version.</P> 52<hr><p>CONFIDENTIAL</p></body> 53</HTML> 54
