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A novel method to increase LinLog CMOS sensors' performance in high dynamic range scenarios
Antonio Martínez-Sánchez1, Carlos Fernández, Pedro J Navarro
1Supercomputing and Algorithms Group, CSIC-UAL Associated Unit, University of Almeria, 04120 Almeria, Spain. anmartinezs@ual.es
Sensors (Basel, Switzerland)
|December 14, 2011
Summary
This study introduces a new method for LinLog CMOS sensors to capture high dynamic range (HDR) images with minimal data loss. The adaptive controller rapidly adjusts sensor response, preserving image quality and detail in challenging scenes.
Area of Science:
- Image sensor technology
- Computational imaging
Background:
- High dynamic range (HDR) imaging requires maximizing information capture from sensors.
- Current methods may not fully utilize sensor quantification levels.
- LinLog CMOS sensors offer adjustable response curves combining linear and logarithmic properties.
Purpose of the Study:
- To present a novel, rapid method for adjusting LinLog CMOS sensor response parameters.
- To enable efficient HDR image acquisition with minimal information loss.
Main Methods:
- Utilizing an Adaptive Proportional-Integral-Derivative (PID) controller to manage sensor exposure time.
- Implementing control algorithms based on image saturation levels and entropy.
- Leveraging the adjustable response curve of LinLog CMOS sensors.
Main Results:
- Achieved rapid adaptation to new scenes in under eight frames in real-time video mode.
- Enabled full utilization of the sensor's 120 dB maximum dynamic range.
- Retained at least 67% of the scene's entropy, ensuring high image quality.
Conclusions:
- The proposed adaptive control method significantly enhances HDR image acquisition with LinLog CMOS sensors.
- This technique allows for fast, automatic adjustments to varying scene conditions.
- It effectively balances dynamic range utilization and information preservation in imaging.
