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Real-Time Processing for Logarithmic CMOS Image Sensors Open Access


Other title
Logarithmic image sensors
Tone mapping
Real time
FPN correction
Type of item
Degree grantor
University of Alberta
Author or creator
Li, Jing
Supervisor and department
Joseph, Dileepan (Electrical and Computer Engineering)
Examining committee member and department
Cockburn, Bruce (Electrical and Computer Engineering)
Jagersand, Martin (Computer Science)
Department of Electrical and Computer Engineering
Digital Signal & Image Processing
Date accepted
Graduation date
Master of Science
Degree level
This thesis proposes a real-time DSP design for logarithmic CMOS image sensors. The design contains novel FPN correction and tone mapping methods suitable for fixed-point operation. Logarithmic CMOS image sensors offer high DR at video rate but suffer from nonlinear FPN. FPN, due to parameter variation across pixels, results in lower image quality. A new method based on the Taylor series is introduced to correct nonlinear FPN effectively and efficiently. After FPN correction of a high-DR scene, reproducing it for display is challenging. Subjective DR needs to be communicated to human observers while objective DR must be compressed to suit the DR of a standard display. A new method maps tones of high-DR scenes for standard displays while limiting the visibility of camera noise. The new FPN correction and tone mapping methods both exhibit low computational complexity, which make them ideal for real-time processing. A fixed-point design of the proposed DSP is developed to further reduce computational complexity, enabling lower power consumption. Although experiments were done with a standard logarithmic CMOS image sensor, the proposed methods may be applied to other nonlinear image sensors thanks to their inherent generality.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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