Range Measurement Apparatus Anti-Vibration Aberration Correction
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Solution Overview
Problem
Existing range measurement apparatuses with anti-vibration mechanisms suffer from distance measurement errors due to image surface curvature and eccentric aberration caused by anti-vibration, leading to inaccurate distance calculations, especially in digital cameras and video cameras.
Innovation Solution
A range measurement apparatus with an image information acquisition unit, distance information acquisition unit, and distance correction unit that corrects distance information based on aberration information from the anti-vibration optical system's driving amount, using multiple defocus correction maps and aberration data to account for image surface curvature and eccentric aberration, enabling high-precision distance measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If anti-vibration optical system is operated to prevent image blur, then image quality is improved, but distance measurement precision deteriorates due to image surface curvature and eccentric aberration
Solution Approach 1:
The patent applies parameter changes by using multiple defocus correction maps corresponding to different driving amounts of the anti-vibration optical system. The system selects or interpolates the appropriate correction map based on the actual driving amount, thereby dynamically adjusting the correction parameters to maintain distance measurement precision while the anti-vibration function operates.
Solution Approach 2:
The system incorporates feedback by utilizing the driving amount information from the anti-vibration optical system to select or interpolate the appropriate defocus correction map. This feedback mechanism ensures that the correction is continuously adjusted according to the actual anti-vibration operation, maintaining measurement precision throughout the process.
2Productivity
If distance measurement is performed during anti-vibration operation, then real-time distance information is obtained, but measurement accuracy deteriorates due to aberration-induced image surface curvature
Solution Approach 1:
The patent applies preliminary action by pre-preparing multiple defocus correction maps corresponding to different driving amounts of the anti-vibration optical system before actual measurement. During real-time operation, the system simply selects or interpolates the appropriate pre-computed correction map, enabling accurate distance measurement without requiring complex real-time calculations.
Solution Approach 2:
The system changes the correction parameters by selecting or interpolating different defocus correction maps based on the actual driving amount of the anti-vibration system. This parameter change approach allows the system to adapt to varying anti-vibration conditions while maintaining real-time measurement capability and accuracy.
3Device complexity
If single defocus correction map is used for simplicity, then device complexity is reduced, but measurement precision deteriorates due to inability to account for varying anti-vibration driving amounts
Solution Approach 1:
The patent applies parameter changes by organizing multiple defocus correction maps according to the driving amount parameters of the anti-vibration optical system. The system uses these parameterized correction maps to accurately represent the relationship between anti-vibration driving amount and image surface curvature, thereby achieving high precision without excessive complexity.
Solution Approach 2:
The system introduces dynamics by making the correction map selection or interpolation process adaptive to the actual driving amount of the anti-vibration optical system. This dynamic approach allows the system to automatically adjust the correction parameters based on real-time conditions, improving precision without requiring manual intervention or overly complex fixed structures.
Data Source
AI summary
In order to provide a range measurement apparatus which enables an accurate distance measurement while an anti-vibration mechanism is operated, the range measurement apparatus includes an image information acquisition unit configured to acquire an image captured by an image pickup optical system having an anti-vibration optical system, a distance information acquisition unit configured to acquire distance information regarding a distance to a subject based on the image, and a distance correction unit configured to correct the distance information based on aberration information according to a driving amount of the anti-vibration optical system.