Imaging Device Light Sensitivity Calibration Iterative Shutter Lag
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Solution Overview
Problem
Conventional light sensitivity calibration methods in imaging devices are inaccurate due to the inconsistency between predetermined and actual mechanical shutter lag times, affecting exposure accuracy in both preview and capture modes.
Innovation Solution
A method and system that iteratively adjust the exposure time based on obtained light sensitivity, replacing the predetermined time with an adjusted time until it converges within a predetermined range, ensuring accurate light sensitivity and mechanical shutter calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a predetermined lag time is used for mechanical shutter calibration, then the calibration procedure can be simplified, but the light sensitivity calibration accuracy deteriorates due to inconsistency between predetermined and actual lag times
Solution Approach 1:
The patent implements an iterative feedback mechanism where the light sensitivity calibration result is fed back to adjust the mechanical shutter lag time parameter. The operating center uses the obtained light sensitivity to calculate an adjusted lag time, which then becomes the basis for the next calibration iteration, continuing until convergence is achieved. This feedback loop resolves the contradiction by automatically adapting the predetermined lag time to match the actual mechanical shutter behavior.
Solution Approach 2:
The patent dynamically changes the lag time parameter from a fixed predetermined value to an adjusted value that converges through iterative calculations. The operating center modifies the lag time parameter based on the light sensitivity calibration results, transforming the static parameter into a dynamic one that adapts to actual device conditions. This parameter change enables both simplified calibration procedure and high accuracy.
2Reliability
If mechanical shutter calibration is performed with accurate lag time, then exposure accuracy is improved, but the calibration process becomes more complex due to the interdependence of light sensitivity and shutter calibration
Solution Approach 1:
The patent merges the light sensitivity calibration process and the mechanical shutter calibration process into a single integrated iterative procedure. Instead of performing calibrations separately, the operating center simultaneously adjusts both light sensitivity and lag time parameters through repeated iterations until both converge to accurate values. This merging approach maintains high reliability while managing complexity through unified processing.
Solution Approach 2:
The patent performs preliminary light sensitivity calibration using an initial predetermined lag time before the final mechanical shutter calibration is complete. This preliminary action provides an initial accurate light sensitivity value that can then be used to refine the lag time parameter in subsequent iterations. The preliminary calibration prepares the system for more accurate final calibration without requiring the entire process to be overly complex.
3Measurement precision
If iterative adjustment of exposure time is performed until convergence, then light sensitivity calibration accuracy is improved, but the calibration time increases
Solution Approach 1:
The iterative feedback mechanism continuously monitors the convergence of the adjusted time and stops when the difference between successive iterations falls within a predetermined threshold. This feedback control ensures high accuracy is achieved without unnecessary excessive iterations, balancing calibration precision with time efficiency. The system automatically determines when sufficient accuracy has been reached.
Solution Approach 2:
The patent dynamically adjusts the exposure time parameter through iterative changes until convergence within a predetermined range is achieved. By using parameter changes with convergence criteria, the system achieves high measurement precision while limiting the total calibration time to a practical duration. The parameter adjustment stops automatically when the predetermined range is satisfied.
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 light sensitivity calibration by repeatedly adjusting exposure times until the desired convergence is achieved, improving exposure accuracy in both preview and capture modes.
Implementation Method 1
an image sensing element, and is used to convert a light signal to an electric signal suitable to be post-processed by a processing unit
Data Source
AI summary
The present invention is directed to a light sensitivity calibration method and an imaging device. An exposure step is performed to obtain a light sensitivity according to a predetermined time. A time adjustment step is performed to adjust the predetermined time according to the light sensitivity, thereby obtaining an adjusted time. The predetermined time is replaced with the adjusted time and the exposure and time adjustment steps are repeatedly performed, until the adjusted time converges within a predetermined range.