Handheld Stereo Camera Layout for Repetitive Feature Matching
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Solution Overview
Problem
Existing stereophotogrammetry devices face errors in image matching due to parallel alignment of the stereo base with repetitive features in modern buildings, leading to incorrect image composition and measurement flaws, particularly in man-made structures with uniform and repeating features.
Innovation Solution
A handheld device with a diagonally aligned stereo base relative to its longitudinal axis, incorporating an evaluation unit that accounts for this alignment during stereophotogrammetric evaluation to recognize repeating patterns and determine the repetition direction of features, thereby reducing errors in image matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the stereo base is aligned parallel to the direction of repetition in modern buildings, then the device complexity is reduced and ease of operation is improved, but the measurement precision deteriorates due to incorrect feature matching
Solution Approach 1:
The stereo base is intentionally misaligned at an angle (e.g., 15-30 degrees) relative to the device's longitudinal axis, creating an asymmetric configuration. This asymmetric arrangement ensures that the epipolar lines do not run parallel to the repetitive horizontal or vertical features of modern buildings, thereby preventing incorrect feature matching while maintaining simple device operation.
2Device complexity
If the stereo base is aligned parallel to the direction of repetition, then the device complexity is reduced, but the reliability of image matching deteriorates due to errors in assigning similar features
Solution Approach 1:
The stereo base is intentionally misaligned at an angle (e.g., 15-30 degrees) relative to the device's longitudinal axis, creating an asymmetric configuration. This asymmetric arrangement ensures that the epipolar lines do not run parallel to the repetitive horizontal or vertical features of modern buildings, thereby preventing incorrect feature matching while maintaining simple device operation.
3Ease of manufacture
If conventional stereophotogrammetry is used with parallel stereo base alignment, then the manufacturing precision is simplified, but the measurement accuracy deteriorates when features are uniformly repeated
Solution Approach 1:
The stereo base is intentionally misaligned at an angle (e.g., 15-30 degrees) relative to the device's longitudinal axis, creating an asymmetric configuration. This asymmetric arrangement ensures that the epipolar lines do not run parallel to the repetitive horizontal or vertical features of modern buildings, thereby preventing incorrect feature matching while maintaining simple device operation.
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3c
AI summary
The invention relates to a handheld device (1) for image-based measurement of a remote object (5), comprising a housing (10) with a front (11) and a back (12), a first and second camera (3a, 3b) arranged with a stereo base (30) on the back (12) for capturing images (51, 52) of the object (5), an evaluation unit with an algorithm for stereophotogrammetric evaluation of the images (51, 52) of the cameras (3a, 3b), and a display unit (20) arranged on the front (11) for displaying images (50) of the object (5) and results of the stereophotogrammetric evaluation, wherein the housing (10) has a longitudinal axis (15), the stereo base (30) is diagonally aligned relative to the longitudinal axis (15), and the evaluation unit is designed to take into account the relative orientation of the stereo base (30) during stereophotogrammetric evaluation.