Photogrammetry Guidance Using B/H Ratio Tracking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Handheld camera photogrammetry requires high skill and is inefficient due to reliance on intuition for achieving adequate overlapping images, as the stability of the camera's optical axis and direction are not easily known during photographing.
Innovation Solution
A method and device that involve moving image capture, extracting characteristic points, performing image tracking, selecting orientation points, and displaying guidance on a display unit when the B/H value reaches a predetermined threshold, ensuring accurate and efficient acquisition of still images suitable for photogrammetry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a handheld camera is used for photogrammetry, then portability and ease of operation are improved, but measurement precision and reliability deteriorate due to unstable optical axis and unknown camera direction
Solution Approach 1:
The patent applies feedback by continuously monitoring the B/H value (ratio of baseline distance to flying height) during UAV flight and providing real-time guidance to the operator. The system calculates the actual camera position and orientation using GPS and inertial sensors, compares it with the planned photogrammetry parameters, and provides feedback signals to adjust the flight path or triggering timing to maintain adequate overlap and measurement precision.
Solution Approach 2:
The patent replaces manual mechanical positioning and judgment with automated electronic systems. Instead of relying on the operator's intuition and manual camera positioning, the system uses GPS receivers, inertial measurement units, and computer algorithms to automatically determine camera position, orientation, and timing, thereby eliminating the instability of manual handheld operation while maintaining portability.
2Measurement precision
If adequate overlapping amount is ensured for photogrammetry, then measurement precision is improved, but productivity deteriorates due to inability to confirm adequate photographing until after orientation processing
Solution Approach 1:
The patent applies preliminary action by pre-calculating and displaying the optimal triggering timing and flight position before actual photographing occurs. The system computes the required B/H value and overlap parameters in advance, provides real-time guidance to the operator during flight, and automatically triggers the camera at the precise moment when photogrammetry conditions are met, eliminating the need for post-processing verification.
Solution Approach 2:
The system continuously provides feedback during the photographing process by monitoring actual camera position, orientation, and B/H value, and comparing them with the predetermined photogrammetry requirements. This real-time feedback enables the operator to adjust flight path or timing immediately, ensuring adequate overlap is achieved during the actual operation rather than being discovered only after processing.
3Productivity
If real-time guidance display is implemented, then productivity is improved by enabling immediate confirmation of adequate photographing, but device complexity increases due to additional processing and display requirements
Solution Approach 1:
The patent applies multi-functionality by integrating multiple functions into the UAV control system: GPS reception, inertial measurement, image processing for B/H calculation, real-time display, and automated triggering control all work within a single integrated system. This reduces the need for separate standalone devices and minimizes overall system complexity while providing comprehensive real-time guidance functionality.
Data Source
AI summary
A photographing device comprises an image pickup unit to acquire a moving image and a still image of an object, an image pickup control unit, an angle sensor, an image processing unit for extracting characteristic points from a first still image, tracking the characteristic points in the moving image, identifying the characteristic points in a newest image and selecting an orientation point common to the first still image and the newest image, a storage unit, a display unit, and an arithmetic unit. The arithmetic unit performs relative orientation between the first still image and the newest image based on the orientation point and on detection result of the angle sensor, obtains a distance H to the object and a distance B between points where the images have been photographed and performs guidance display where still images can be acquired sequentially when the B/H value reaches a predetermined value or higher.