Image Capture Shift Correction via Angular Displacement
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Solution Overview
Problem
Conventional image capturing apparatuses experience a decrease in correction precision and increased vector detection errors during zoom operations due to changes in focal length, leading to unnatural camera shake correction and malfunction.
Innovation Solution
An image capturing apparatus that converts detected motion vector quantities into angular displacement amounts based on zoom lens position, calculates shift angles, and applies corrections on the image plane to maintain consistent blurring correction across focal length changes, using pixel-angle conversion and angle-pixel conversion circuits to integrate and adjust for focal length variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If motion vector detection is performed using conventional block matching during zoom operations, then camera shake correction can be applied, but correction precision decreases and vector detection errors increase due to focal length changes
Solution Approach 1:
The patent converts motion vector quantities into angular displacement amounts based on zoom lens position, and then converts angular displacement back into shift amounts on the image plane. This parameter transformation approach accounts for focal length changes during zoom operations, maintaining correction precision across different zoom levels by dynamically adjusting the conversion parameters based on current focal length.
Solution Approach 2:
The patent introduces angular displacement as an intermediary parameter between motion vector detection and image plane correction. By converting the detected motion vector into angular displacement and then back into image plane shift amount, the system creates a coordinate-invariant correction mechanism that works consistently across different focal lengths and zoom positions.
2Productivity
If zoom operations are performed at high speeds, then productivity is improved, but vector detection errors and malfunctions increase
Solution Approach 1:
The patent dynamically adjusts the conversion parameters between angular displacement and image plane shift amount based on the current zoom lens position and focal length. This allows the system to maintain accurate motion vector detection even during high-speed zoom operations by compensating for the rapid changes in optical parameters through real-time parameter updates.
Solution Approach 2:
The patent implements a dynamic correction system that continuously adapts to changing zoom conditions. By using the zoom lens position as a variable parameter in the conversion process, the system remains responsive and accurate during high-speed zoom operations, rather than relying on fixed correction parameters that would fail under dynamic conditions.
3Device complexity
If conventional motion vector detection is used without angular conversion, then device complexity is reduced, but correction precision varies with focal length changes
Solution Approach 1:
The patent introduces angular displacement conversion as an additional processing step that transforms motion vector quantities into angular values and then back into image plane shift amounts. This parameter conversion approach adds computational complexity but ensures consistent correction precision across all focal lengths by accounting for the geometric relationship between angular movement and image plane displacement.
Data Source
AI summary
An image capturing apparatus comprises an image capturing unit, a motion vector detection unit which detects a motion vector quantity representing a shift amount between images from image signals successively obtained by the image capturing unit, an angle conversion unit which converts the motion vector quantity into an angular displacement amount between the images on the basis of a zoom position of the zoom lens, a shift angle calculation unit which calculates a shift angle from an optical axis of the imaging optical system by calculating the angular displacement amount, a shift amount conversion unit which converts the shift angle into a shift amount on an image plane of the image capturing unit on the basis of the zoom position of the zoom lens, and a correction unit which corrects a shift on the basis of the shift amount on the image plane.