Imaging Sensor Dual-Mode Difference Detection for Low Power
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Solution Overview
Problem
CMOS image sensors in security cameras consume significant power due to A/D conversion, data transfer, and image processing, which is inefficient for low-power applications.
Innovation Solution
An imaging device with a dual-mode operation: a first mode for minimal analog processing to generate a trigger signal and a second mode for detailed digital processing, reducing power consumption by minimizing digital processing until necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If A/D conversion and digital image processing are continuously performed, then image analysis accuracy is improved, but power consumption increases
Solution Approach 1:
The imaging device dynamically switches between two operational modes: a first mode performing minimal analog processing for low power consumption, and a second mode performing full digital processing for high accuracy. This dynamic adaptation allows the system to optimize the balance between power consumption and image analysis accuracy based on real-time requirements
Solution Approach 2:
The system changes the processing parameter from continuous digital processing to conditional digital processing. A trigger signal generated by analog difference calculation determines whether digital processing is activated, thereby changing the operational state parameter between low-power and high-accuracy modes
2Measurement precision
If continuous digital processing is performed, then detection accuracy is improved, but processing time increases
Solution Approach 1:
The analog processing circuit performs preliminary difference calculation and generates a trigger signal before digital processing is activated. This preliminary action filters out frames that do not require detailed analysis, reducing the overall processing time while maintaining detection accuracy for relevant events
Solution Approach 2:
The system dynamically adjusts processing intensity based on scene changes. By using analog difference calculation to detect motion or changes, the system activates full digital processing only when necessary, thereby reducing average processing time while maintaining high detection accuracy when events occur
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The dual-mode operation reduces power consumption by performing only minimal analog processing for trigger signal generation and detailed digital processing only when needed, while maintaining effective image analysis.
Implementation Method 1
a pixel including a photoelectric conversion element and a transistor
Data Source
AI summary
An imaging device capable of detecting differences with low power consumption is provided. The imaging device includes a pixel including a photoelectric conversion element and a transistor; an analog processing circuit; and a digital processing circuit. The imaging device is operated in a first mode and a second mode. In the first mode, the analog processing circuit detects a difference between first imaging data taken by the pixel and second imaging data taken by the pixel and generates a trigger signal on the basis of the value of the difference. In the second mode, the digital processing circuit converts third imaging data taken by the pixel into digital data. Switching from the first mode to the second mode is performed on the basis of the trigger signal.