Dynamic Spectral Sensor Exposure Control for Low-Light Color Accuracy
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Solution Overview
Problem
In low-light environments, spectral sensors struggle to capture accurate spectral data, leading to inaccurate correlated color temperature calculations and poor white balance in images, resulting in color casts.
Innovation Solution
Dynamically adjust exposure parameters of the spectral sensor, such as exposure time and analog gain, based on environmental light conditions to enhance data accuracy and improve white balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the spectral sensor uses narrow-band filtering to capture spectral data, then the spectral data can be obtained for color temperature calculation, but in dark light environments the sensor cannot implement enough exposure leading to inaccurate spectral data
Solution Approach 1:
The patent implements dynamic adjustment of exposure parameters (exposure time and analog gain) based on the Clear channel signal strength. The system switches between different exposure modes: extending exposure time when Clear value is low, increasing analog gain when exposure time is insufficient, and combining both adjustments in very low light conditions. This dynamic adaptation resolves the contradiction between maintaining spectral data accuracy and improving light sensitivity in dark environments.
Solution Approach 2:
The patent changes physical parameters of the spectral sensor (exposure time and analog gain) to adapt to different lighting conditions. By adjusting these parameters based on the Clear channel feedback, the system optimizes the signal-to-noise ratio of spectral data while ensuring sufficient light capture in dark environments, thereby resolving the contradiction between measurement precision and illumination intensity requirements.
2Illumination intensity
If the exposure time of the spectral sensor is extended to capture more light in dark environments, then the spectral data exposure is improved, but the overall photographing time is increased
Solution Approach 1:
The system dynamically adjusts exposure time based on real-time Clear channel measurements. Instead of using a fixed long exposure time for all low-light conditions, the system determines the minimum necessary exposure time to achieve adequate signal strength, thereby reducing unnecessary time loss while still improving light capture capability when needed.
Solution Approach 2:
The patent adjusts exposure time as a variable parameter rather than a fixed setting. By changing exposure time adaptively based on lighting conditions and coordinating with analog gain adjustments, the system optimizes the balance between light capture capability and photographing time, achieving sufficient exposure without excessive time loss.
3Measurement precision
If the analog gain of the spectral sensor is increased to amplify the spectral signal, then the spectral data accuracy is improved, but the noise in the signal is also amplified
Solution Approach 1:
The system dynamically adjusts analog gain based on the Clear channel signal strength and current exposure time. By coordinating gain adjustment with exposure time optimization, the system achieves adequate signal amplification while minimizing noise amplification. The adaptive control ensures analog gain is increased only to the extent necessary for accurate measurement, preventing excessive noise amplification.
Solution Approach 2:
The patent treats analog gain as a controllable parameter that can be adjusted to optimize the signal-to-noise ratio. By changing analog gain in coordination with exposure time adjustments, the system achieves the desired spectral data accuracy while managing noise levels, resolving the contradiction between measurement precision and harmful signal noise.
4Measurement precision
If the exposure parameters of the spectral sensor are adjusted dynamically, then the spectral data accuracy in varying light conditions is improved, but the control complexity of the sensor is increased
Solution Approach 1:
The patent implements a dynamic control system that automatically adjusts exposure parameters based on Clear channel feedback. The control logic uses threshold-based decision making and coordinated adjustment of exposure time and analog gain, which improves spectral data accuracy across varying light conditions while keeping the control mechanism relatively simple and manageable.
Solution Approach 2:
The system changes exposure parameters (exposure time and analog gain) as adjustable variables to adapt to different lighting conditions. This parameter-based control approach improves measurement precision while maintaining manageable device complexity through systematic and coordinated parameter adjustment rather than complex structural modifications.
Data Source
AI summary
An electronic device and a method for dynamically adjusting an exposure parameter of a spectral sensor. The method includes: The electronic device determines whether a Clear value is less than or equal to a first threshold; and if the Clear value is less than or equal to the first threshold, the electronic device determines whether an analog gain of the spectral sensor reaches a second threshold; and if the analog gain of the spectral sensor reaches the second threshold, the electronic device extends an exposure time of the spectral sensor; or if the analog gain of the spectral sensor does not reach the second threshold, the electronic device increases the analog gain of the spectral sensor.