Image Sensor Reference Level Reset Timing
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Solution Overview
Problem
Asynchronous image sensors face delays in resetting the reference level after event detection, leading to degraded accuracy and precision in event detection due to the time required for notification and instruction processing.
Innovation Solution
The image sensor includes a photoreception section, an event detection section, a retention section, a readout section, and a reset section that swiftly updates the reference level to the current photoreception signal level after event detection, allowing for improved accuracy and precision by resetting the reference level before the readout of the event signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the reference level is reset in response to the readout of an event signal, then the readout process can be completed, but the reference level update is delayed causing degraded accuracy and precision in event detection
Solution Approach 1:
The patent applies preliminary action by resetting the reference level to the current photoreception signal level immediately after event detection, before the event signal readout is completed. This advance reset ensures that the reference level is updated promptly, preventing accuracy degradation and maintaining high event detection precision without waiting for the readout process to finish.
2Measurement precision
If the reference level is reset immediately after event detection, then accuracy and precision are improved, but the readout process may be interrupted or become complex
Solution Approach 1:
The patent uses feedback by monitoring the event detection signal from the event detection section and automatically triggering the reset section to update the reference level. This feedback mechanism ensures that the reference level is reset at the appropriate moment based on actual detection events, improving accuracy while maintaining straightforward control logic without complex timing interruptions.
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 solution ensures improved accuracy and precision in event detection by swiftly updating the reference level, preventing omissions and enhancing the overall performance of the image sensor.
Implementation Method 1
a photoreception section configured to acquire an electric signal proportional to an amount of light received as a photoreception signal
Data Source
AI summary
An image sensor with improved reference level accuracy for event detection and event detection precision is disclosed. In one example, an image sensor includes a photoreception section, an event detection section, a retention section, a readout section, and a reset section. The photoreception section acquires an electric signal proportional to an amount of light received as a photoreception signal. The event detection section detects a change in the amount of light received as an event by finding a difference between a reference level, and a current photoreception signal level. The retention section retains a detection signal that is based upon detection of the event. The readout section reads out the detection signal as an event signal. The reset section resets the reference level to the readout of the event signal by the readout section.