Imaging Device Pre-light Emission Control for Light Accuracy
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Solution Overview
Problem
The accuracy of light control for main light emission in imaging devices is compromised due to poor distance information and high external light luminance, leading to a deterioration in the S/N ratio and potential exceeding of the photometry possible range.
Innovation Solution
An imaging device with a control unit that adjusts the pre-light emission quantity by obtaining a first quantity without distance information, an appropriate quantity with distance information, and a final quantity based on the accuracy of distance information, while also considering external light luminance to prevent S/N ratio deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If distance information is used to calculate pre-light emission quantity, then light control accuracy for main light emission is improved, but when distance information accuracy is poor, the light control accuracy deteriorates
Solution Approach 1:
The patent performs preliminary light emission to measure reflection light before main light emission, using this measurement to calculate the appropriate pre-light emission quantity that will ensure accurate photometry during main light emission without exceeding the photometry possible range
Solution Approach 2:
The patent uses the measured reflection light from preliminary emission as feedback to adjust and determine the pre-light emission quantity, creating a closed-loop control system that adapts to actual lighting conditions and distance information accuracy
2Reliability
If pre-light emission quantity is increased to ensure photometry range coverage, then photometry possible range is maintained, but when external light luminance is high, the S/N ratio deteriorates
Solution Approach 1:
The patent dynamically adjusts the pre-light emission quantity parameter based on measured reflection light and external light luminance conditions, changing this parameter to optimize both photometry range coverage and S/N ratio maintenance
Solution Approach 2:
The patent implements a dynamic adjustment mechanism where the pre-light emission quantity is not fixed but is continuously optimized based on real-time measurements of reflection light and external light conditions, adapting to varying luminance environments
Data Source
AI summary
With a pre-light emission quantity adjusted to an appropriate value, the accuracy of light control for main light emission can be enhanced. A first pre-light emission quantity is obtained with no use of distance information. An appropriate light emission quantity is obtained with use of distance information, and a second pre-light emission quantity is obtained by decreasing the appropriate light emission quantity by a predetermined quantity according to a photometric wave detection capacity. A final pre-light emission quantity is obtained by mixing the first pre-light emission quantity and the second pre-light emission quantity, at a ratio corresponding to the accuracy of the distance information used to obtain the appropriate light emission quantity.