Handheld Photogrammetry Edge Measurement
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Solution Overview
Problem
Existing hand-held photogrammetry devices are difficult for laypersons and inexperienced users to operate effectively for accurate image-based edge measurement, as they require complex user intervention and may produce inconsistent results.
Innovation Solution
A method and device that automatically identifies edges in images using stereophotogrammetry, with algorithms to determine edge lengths and display them on a user interface, allowing for intuitive and accurate edge measurement without user intervention, and includes adaptive pattern recognition for typical features like windows and doors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual point marking and distance calculation methods are used on touchscreen displays, then measurement capability is provided, but ease of operation deteriorates and user complexity increases
Solution Approach 1:
The system performs automatic edge detection and measurement without requiring user intervention. The evaluation unit automatically identifies edges in the captured image, calculates their lengths using photogrammetric data, and displays the results, allowing the system to serve itself rather than requiring manual user operations.
Solution Approach 2:
The patent replaces manual mechanical interaction (touchscreen point marking) with automated computational processing. The evaluation unit uses algorithms to detect edges and calculate measurements automatically, substituting the mechanical user interaction system with an automated image processing and computation system.
2Productivity
If automatic edge detection algorithms are implemented, then productivity improves, but device complexity increases
Solution Approach 1:
The evaluation unit serves multiple functions: it performs photogrammetric evaluation of captured images, automatically detects edges using image processing algorithms, calculates edge lengths using 3D coordinate data, and displays results. This multi-functionality consolidates what would otherwise require separate systems into a single integrated unit.
Solution Approach 2:
The evaluation unit acts as an intermediary between the image capture device and the display system. It processes the raw image data and photogrammetric information, automatically extracts edge measurements, and presents the processed results to the user, mediating between the complex processing requirements and the simple display output.
3Measurement precision
If photogrammetric evaluation methods are used, then measurement precision improves, but ease of operation deteriorates
Solution Approach 1:
The system automatically performs photogrammetric evaluation and edge measurement without requiring user expertise or intervention. The evaluation unit independently processes the images, applies photogrammetric algorithms, and generates measurements, allowing the system to self-service rather than requiring skilled user operation.
Solution Approach 2:
The system performs preliminary photogrammetric evaluation of the captured image to establish 3D coordinate information and edge characteristics before final measurement display. This preliminary processing prepares the data in advance, enabling accurate measurements to be automatically generated without requiring user understanding of the complex photogrammetric processes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables simple, quick, and accurate edge measurement in scenes, even for inexperienced users, with automatic edge detection and measurement functionality that reduces user confusion and ensures consistent accuracy.
Implementation Method 1
capturing at least one first image and a second image of the scene with at least one camera of the device
Implementation Method 2
stereophotogrammetric evaluation of the first and second images
Data Source
Figure 1a~1b
Figure 1c~1d
Figure 2~3
AI summary
The invention relates to a method for image-based measurement of a scene using a handheld device, comprising: recording at least one first image and one second image of the scene by at least one camera of the device; photogrammetric evaluation of the first and second images; and graphical output of an image of the scene on a display unit. The method is characterized by an automatically executed edge measurement functionality in which, without user intervention, edges (60, 61) in the scene are identified based on the at least one image of the scene, edge lengths (62) of the identified edges (60, 61) are determined based on the photogrammetrically evaluated images, and the determined edge lengths (62) are displayed in the image of the scene. The invention further relates to a handheld device and a computer program product with program code for executing the method.