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Autobrite Whitepaper
This paper addresses the requirements for wide dynamic range cameras in automotive machine vision applications. The paper describes the architecture of a CMOS image sensor pixel and explores mechanisms for overcoming the effects of noise and saturation to achieve wide dynamic range.
The linear response curve of a standard pixel is used to illustrate the effect of integration time on dynamic range. Alternative methods are presented for expanding dynamic range of image sensors, including multiple integration and logarithmic response. Each method is
shown to have significant disadvantages.
Autobrite® proprietary technology from Melexis is described. An explanation of variable height/multiple reset and barrier voltage demonstrates how Autobrite offers superior interscene and intrascene dynamic range. A description of the control mechanism shows how Autobrite provides adaptive and programmable wide dynamic range.
The paper concludes that only cameras equipped with Autobrite match the dynamic range of the image sensor to both the scene and the application. Autobrite-enabled cameras offer superior wide dynamic range performance for capturing complete and accurate visual information in driver assistance systems.
Current Revision:
April 2009
File Type:
White Paper
File Size:
542.8 KB
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