Image Blur Correction Device Angular Velocity Calculation
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Solution Overview
Problem
Existing image blur correction techniques for panning imaging are prone to errors due to inaccurate calculation of subject angular velocity, especially when the motion is non-uniform and involves angular acceleration, leading to degraded image blur correction performance.
Innovation Solution
An image blur correction device that acquires focal distance information and angular velocity data, calculates subject angular velocity by considering temporal changes and averaging multiple measurements, and controls the correction unit based on determined angular velocity to accurately correct image blur during exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If angular acceleration is predicted based on temporal change of subject angular velocity calculated from vector detected from out-of-focus image, then image blur correction can be performed considering acceleration, but angular acceleration calculation becomes inaccurate leading to deviated angular velocity
Solution Approach 1:
The patent performs preliminary in-focus imaging before the main exposure to obtain accurate subject angular velocity data. This preliminary action ensures that the angular velocity calculation is based on clear, focused images rather than out-of-focus images, thereby avoiding inaccurate angular acceleration prediction while still enabling correction for accelerated motion.
Solution Approach 2:
The patent replaces the mechanical/vector-based motion detection method (which uses template matching on image surfaces) with a optical focusing-based method. By using in-focus images to calculate angular velocity, the system achieves more accurate motion measurement without relying on vector detection from blurred images.
2Productivity
If vector detection method using template matching is used to detect subject motion on image surface, then motion amount can be calculated, but calculation accuracy deteriorates when image is blurred
Solution Approach 1:
The system performs preliminary in-focus imaging before the main exposure to obtain accurate motion data. This preliminary focused image capture ensures that template matching or other vector detection methods operate on sharp images, maintaining high measurement precision while still enabling motion detection functionality.
Solution Approach 2:
The patent changes the critical parameter of image focus from out-of-focus to in-focus state during the preliminary imaging phase. This parameter change ensures that the image quality is sufficient for accurate vector detection and template matching, thereby maintaining both productivity and measurement precision.
3Device complexity
If subject angular velocity is calculated before exposure without considering angular acceleration, then calculation is simpler, but time lag occurs between calculation time point and actual imaging causing correction error
Solution Approach 1:
The patent performs the angular velocity calculation based on in-focus images immediately before the main exposure as a preliminary action. This timing minimizes the time lag while keeping the calculation relatively simple, achieving a balance between complexity and accuracy by using focused images for more reliable velocity measurement.
Solution Approach 2:
The system uses feedback from the preliminary in-focus imaging to adjust and determine the subject angular velocity right before exposure. This feedback mechanism ensures that the angular velocity value used for correction is current and accurate, compensating for any time lag effects without requiring complex acceleration predictions.
Data Source
AI summary
An imaging apparatus includes a correction lens for changing an image forming position of a subject image on an imaging unit, and performs an image blur correction by drive control of the correction lens. A subject angular velocity calculation unit calculates an angular velocity of the subject with respect to the imaging apparatus from a focal distance of an imaging optical system, a motion of the imaging apparatus, and a motion of the subject. A panning imaging control unit performs control for supporting panning imaging of a user. A subject angular velocity determination unit switches a method of calculating the angular velocity of the subject at a time of an exposure according to whether an autofocus state of the imaging optical system is in focus or out of focus on the basis of a change over time of the angular velocity of the subject, a time at which the angular velocity is calculated, and an imaging time.