Camera Image Stabilization Evaluation Using Bokeh Offset
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for evaluating the performance of a camera's image stabilization function lack accuracy, as they do not adequately account for the intrinsic bokeh effect, leading to incomplete assessments of image quality.
Innovation Solution
A measurement method that calculates a theoretical motion blur amount and bokeh offset amount, then uses these values to estimate a comprehensive bokeh amount, which is used to evaluate the image stabilization performance by comparing static and vibrated state images, thereby reflecting the bokeh effect's influence on image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only theoretical bokeh amount is used for evaluation, then the evaluation process is simple, but the measurement accuracy is insufficient
Solution Approach 1:
The patent performs preliminary measurement of bokeh offset amount using static state images before the actual vibration-based measurement. This preliminary action separates the intrinsic bokeh effect from the motion blur effect, allowing for more accurate subsequent measurements of image stabilization performance.
Solution Approach 2:
The patent segments the total bokeh amount into two distinct components: bokeh offset amount (intrinsic to the camera) and theoretical motion blur amount (caused by vibration). By calculating the estimated comprehensive bokeh amount as the square root of the sum of squares of these two components, the patent enables precise measurement of image stabilization performance.
2Loss of information
If intrinsic bokeh effect is not considered, then the evaluation is simpler, but the image quality assessment is incomplete
Solution Approach 1:
The patent extracts the bokeh offset amount (intrinsic bokeh effect) from the total bokeh measurement by using static state images where the camera is not vibrated. This extracted component is then removed from the comprehensive bokeh measurement to isolate the motion blur caused by vibration, providing complete information for image quality assessment.
Solution Approach 2:
The patent introduces bokeh offset amount as an intermediary parameter that mediates between the camera's intrinsic optical characteristics and the motion blur caused by vibration. This intermediary enables the separation and independent evaluation of different factors affecting image quality.
Data Source
AI summary
A theoretical motion blur amount is calculated. A static state image is acquired. For each of the plurality of shutter speed values, a bokeh amount at the boundary between different color areas in each of a plurality of the static state images that have been acquired is measured as a bokeh offset amount. A vibrated state image while the camera is being vibrated with its image stabilization function being ON is acquired. A bokeh amount at the boundary between different color areas in each of the plurality of vibrated state images that have been acquired is measured as a measured comprehensive bokeh amount. And an evaluation value indicating the performance of the image stabilization function of the camera is calculated based on the theoretical motion blur amount, the bokeh offset amount, and the measured comprehensive bokeh amount.