Laser Scanning Apparatus Uniform Point Cloud Distribution
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Solution Overview
Problem
Simultaneous laser scanning and photography are inefficient due to the need to decelerate or stop the horizontal rotation unit, leading to motion blur and high-density point clouds that require labor-intensive processing to spread in a grid pattern, which increases work burden and reduces efficiency.
Innovation Solution
A laser scanning apparatus with a horizontally rotatable unit and processor that selectively omits laser scanning data during deceleration, maintaining constant speed rotation and adjusting scanning intervals to ensure uniform data distribution, allowing simultaneous scanning and photography while reducing data density irregularities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the horizontal rotation unit is decelerated or stopped to obtain still images for panoramic photography, then motion blur is prevented and photographic quality is improved, but laser scanning productivity decreases and point cloud density becomes uneven
Solution Approach 1:
The patent applies local quality by differentiating the treatment of laser scanning data based on temporal characteristics. During deceleration phases, the system selectively processes only specific laser scanning data (e.g., every other scan line) to maintain uniform point cloud density, while during constant speed phases, all scanning data is processed normally. This localized differentiation resolves the contradiction by preserving photography quality during deceleration without completely halting scanning productivity.
2Productivity
If laser scanning and photography are performed simultaneously with constant rotation speed, then scanning productivity is maintained, but motion blur occurs in photographic images
Solution Approach 1:
The patent implements dynamics by making the rotation speed variable rather than constant. The system dynamically adjusts the rotation speed of the horizontal rotation unit based on the operational phase: during photography capture, the system decelerates to prevent motion blur, while during scanning phases, it maintains constant speed for maximum productivity. This dynamic speed adjustment allows the system to optimize for either photography quality or scanning efficiency depending on the immediate operational requirements.
3Manufacturing precision
If the horizontal rotation unit rotates very slowly to maintain uniform point cloud density, then scanning data distribution is improved, but work efficiency decreases
Solution Approach 1:
The patent applies preliminary action by pre-planning the rotation speed profile and data selection strategy before actual scanning begins. The system predetermined which scanning data to process during deceleration phases based on the expected rotation speed changes, allowing it to maintain uniform point cloud density without requiring continuous slow rotation. This preliminary planning enables the system to achieve uniform data distribution while maintaining overall high work efficiency.
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
This approach enhances work efficiency by enabling simultaneous laser scanning and photography with reduced post-processing burdens, achieving uniform point cloud distribution and improved scanning data quality.
Implementation Method 1
an optical unit disposed on the vertical rotation unit and having a light emission unit and a light reception unit for laser distance measuring light
Implementation Method 2
laser scanning unit that is configured to perform laser scanning in an upper-lower direction
Data Source
AI summary
Efficiency of a technique for performing laser scanning and photography simultaneously is improved. A laser scanning apparatus includes a horizontally rotatable horizontal rotation unit, a rotation controller, and a processor or circuitry. The horizontal rotation unit includes cameras and a vertical rotation unit that performs laser scanning in an upper-lower direction. The rotation controller controls rotation of the horizontal rotation unit. The processor or circuitry performs a process of not selecting some pieces of laser scanning data that is obtained by laser scanning in the upper-lower direction. Laser scanning and photography that uses the cameras are performed while the horizontal rotation unit is horizontally rotated. The rotation of the horizontal rotation unit is decelerated in performing photography. The processor or circuitry does not select some pieces of laser scanning data that are obtained by laser scanning in the upper-lower direction during the deceleration.