Event Image Sensor Dead Band Control for Stable Address Detection
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Solution Overview
Problem
Asynchronous solid-state image sensors, like dynamic vision sensors, face challenges in controlling detection sensitivity for address events, leading to potential failure in obstacle detection due to either low sensitivity or excessive detection caused by changes in illumination, which affects power consumption and accuracy.
Innovation Solution
A solid-state image sensor with a pixel array unit and a control unit that adjusts the dead band width based on the number of detected address events within a fixed cycle, allowing for dynamic adjustment of detection sensitivity by widening or narrowing the dead band accordingly, and optionally dividing the pixel array into areas for tailored control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the detection sensitivity for address events is increased, then obstacle detection accuracy is improved, but false detections increase when luminance changes due to illumination variations
Solution Approach 1:
The dead band width is made dynamically adjustable rather than fixed. The control unit changes the dead band width based on the detected number of address events, allowing the system to adapt its detection sensitivity to current conditions and avoid false detections while maintaining detection accuracy
Solution Approach 2:
The system uses feedback from the detected number of address events to adjust the dead band width. The control unit continuously monitors address event counts and modifies the dead band parameter accordingly, creating a closed-loop control system that balances detection accuracy with false detection prevention
2Measurement precision
If the detection sensitivity for address events is increased, then obstacle detection accuracy is improved, but power consumption increases due to excessive detection
Solution Approach 1:
The dead band width is dynamically adjusted based on the number of detected address events. When many address events are detected (indicating possible illumination changes), the dead band width is increased to reduce unnecessary detections and lower power consumption, while maintaining sufficient detection capability for actual obstacles
3Device complexity
If a fixed dead band width is used, then the device structure is simple, but detection sensitivity cannot be controlled to an appropriate value
Solution Approach 1:
The system transitions from a fixed dead band width to a dynamically adjustable one. The control unit modifies the dead band width based on the number of detected address events, providing adaptability in detection sensitivity while adding only minimal control logic complexity
Solution Approach 2:
The dead band width parameter is changed dynamically based on detection conditions. By adjusting this key parameter according to the number of address events, the system achieves flexible detection sensitivity control without fundamentally changing the device structure
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
This approach enables precise control of detection sensitivity, reducing false positives and power consumption while ensuring accurate event detection, thereby improving the reliability and efficiency of the image recognition process.
Implementation Method 1
a pixel array unit in which multiple pixel circuits are arranged, each pixel circuit detecting a change in luminance of incident light
Data Source
AI summary
In a solid-state image sensor that detects an address event, the detection sensitivity for the address event is controlled to an appropriate value.The solid-state image sensor includes a pixel array unit and a control unit. In the solid-state image sensor, multiple pixel circuits are arranged in the pixel array unit, each detecting a change in luminance of incident light occurring outside a predetermined dead band as the address event. The control unit controls the width of the dead band according to the number of times the address event is detected in the pixel array unit within a fixed unit cycle.