Blur Correction Device Iterative PSF Refinement
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Solution Overview
Problem
Existing blur correction methods using angular rate sensors suffer from errors such as attachment errors, scale factor errors, and reduced PSF accuracy, leading to inaccurate correction of captured images.
Innovation Solution
A blur correction device that generates and updates blur information using sensor data from a motion detection sensor, including a blur information generation unit, a blur correction unit, an evaluation value calculation unit, and a termination judgment unit, to iteratively improve the blur correction process and determine the final corrected image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If blur correction is performed using PSF obtained directly from angular rate sensor data, then correction processing can be performed without estimating PSF from captured image, but measurement precision of PSF deteriorates due to sensor errors such as attachment error, scale factor error, and drift
Solution Approach 1:
The patent merges two PSF acquisition methods: one based on angular rate sensor data and another based on captured image analysis. By combining these approaches, the system leverages the speed advantage of sensor-based PSF while compensating for its precision limitations through image-based refinement, thereby resolving the contradiction between ease of processing and measurement precision
Solution Approach 2:
The patent implements feedback by using the captured image to evaluate and refine the PSF initially obtained from angular rate sensor data. The correction results are evaluated based on image quality metrics, and the PSF is iteratively adjusted to improve correction accuracy, thus overcoming the precision limitations of direct sensor-based PSF acquisition
2Measurement precision
If iterative correction is performed to improve blur correction accuracy, then measurement precision of correction improves, but processing time increases
Solution Approach 1:
The patent performs preliminary action by obtaining an initial PSF from angular rate sensor data before actual correction processing. This pre-acquired PSF provides a good starting point for iterative refinement, reducing the number of iterations needed and thereby decreasing processing time while maintaining correction accuracy
Solution Approach 2:
The patent applies partial iteration by performing correction processing for a predetermined limited number of times rather than exhaustive iteration. This approach achieves sufficient correction accuracy for practical applications while avoiding excessive processing time, balancing precision and efficiency
Data Source
AI summary
Blur correction device (100) includes: a blur information generation unit (203) which generates blur information based on sensor data indicating camera motion; a blur correction unit (204) which corrects blur in a captured image, based on the blur information, to generate a candidate corrected image; an evaluation value calculation unit (205) which calculates an evaluation value indicating a blur correction level for the candidate corrected image; a termination judgment unit (206) which judges whether the blur correction should be terminated, based on a predetermined condition; and a blur information updating unit which updates the blur information, when the blur correction should not be terminated. When the blur information is updated, the blur correction unit (204) corrects the blur, based on the updated blur information, to generate a new candidate corrected image. When the blur correction should be terminated, the termination judgment unit (206) determines the corrected image from the candidate corrected images, based on the evaluation value.