UAV Single-Camera Tilt Imaging for Large-Area 3D Mapping
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Solution Overview
Problem
Current aerial imaging systems using UAVs face challenges in capturing high-resolution images of large areas efficiently due to limited field of view and increased payload weight from multi-camera setups, which prolong flight time and reduce image quality.
Innovation Solution
A method and system utilizing a single high-resolution camera mounted on a UAV that moves along a straight path, alternately tilting the camera to capture images on both sides with predefined angles perpendicular to the flight direction, eliminating the need for side overlap between images and optimizing overlap to account for camera movement errors, thereby reducing flight time and increasing field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a single high-resolution camera is used on a UAV, then payload weight is reduced and flight time is extended, but the field of view is limited and cannot cover large areas efficiently
Solution Approach 1:
The camera is made dynamically tiltable along the flight path, allowing it to alternate between capturing images on the left and right sides of the flight trajectory. This dynamic adjustment enables a single camera to cover a wider effective area by changing its orientation during flight, resolving the contradiction between limited field of view and large area coverage.
Solution Approach 2:
Instead of expanding the camera's field of view in the horizontal dimension, the solution introduces temporal dimensionality by alternating camera tilts between left and right sides during sequential flight paths. This transforms the coverage problem from a spatial dimension issue to a temporal sequence issue, allowing a single camera to cover large areas through time-based alternation.
2Area of stationary object
If multiple cameras are used to increase field of view, then large areas can be captured simultaneously, but payload weight increases and flight time is reduced
Solution Approach 1:
The single camera alternates dynamically between left-tilt and right-tilt positions during flight, effectively using one camera to perform the function of multiple cameras would provide. This dynamic switching allows the system to maintain large area coverage capability without the weight penalty of multiple cameras, thereby extending flight time.
Solution Approach 2:
The imaging task is segmented into alternating left-side and right-side captures along the flight path. Instead of using multiple cameras to capture all areas simultaneously, the single camera's field of view is segmented across time and space, with each tilt position covering a specific side of the flight trajectory.
3Reliability
If the camera captures images with side overlap to ensure coverage, then complete area coverage is achieved, but flight time is prolonged due to reduced speed
Solution Approach 1:
The camera's dynamic tilting mechanism allows it to capture images on alternating sides of the flight path, optimizing overlap requirements. By tilting the camera along the flight direction, the system achieves reliable area coverage with minimal overlap, enabling faster flight speeds without compromising coverage completeness.
Solution Approach 2:
The system changes the camera's orientation parameter (tilt angle) dynamically during flight, alternating between left and right tilts. This parameter change optimizes the overlap between consecutive images, allowing the UAV to maintain higher flight speeds while ensuring complete and reliable area coverage through mathematical optimization of the tilt angles.
Data Source
AI summary
A method for capturing images of large target area using a single camera configured with an aerial vehicle (AV) for reconstructing a high-resolution image is disclosed including the steps of moving the AV over the area of interest along a straight path; capturing a first set of images of an area down below by pointing an optical axis of the camera towards a first side of the straight path such that the optical axis makes a first predefined angle with vertical; and capturing a second set of images of the area down below by pointing the optical axis of the camera towards a second side of the straight path such that the optical axis makes a second predefined angle with respect to the vertical. Side overlap between the first and second set of images is optimized to account for error in camera movement.