Photogrammetry system is an analytical instrument based on digital image processing and non-contact optical measurement technology. It accurately obtains the three-dimensional coordinates, displacement, strain and other parameters of an object through multi angle shooting and algorithm calculation. The following provides a detailed introduction to the technical knowledge of photogrammetric systems from several aspects, including technical principles, system classification, core functions, technical indicators, and application fields:
Technical Principle
Image acquisition: Use high-resolution digital cameras or industrial cameras to capture surface feature points (such as encoded landmarks) of the object being measured from multiple angles.
Stereoscopic matching: Using graphic correlation algorithms to perform stereo matching on collected images and reconstruct the three-dimensional spatial coordinates of the object being measured. This process involves digital speckle correlation methods and binocular stereo vision technology, among which digital speckle image matching and stereo vision reconstruction are the core principles.
Data analysis: Smooth the displacement field data to achieve strain visualization analysis and tolerance comparison.
system classification
Industrial inspection system: such as Chenwei MPS system (accuracy 5 μ m/m), used for ship component inspection; ProGeo3D can replace laser trackers for reverse engineering.
Vegetation coverage photogrammetry system: such as PLC01 type, can analyze vegetation coverage, support batch image processing and tolerance setting.
Aerial surveying system: such as AC1100 oblique photography system, can generate true 3D models with a maximum flight speed of 10 meters per second.
core functionality
Dynamic deformation measurement and damage detection: Real time monitoring of object deformation and damage.
Automatic comparison between theoretical values and measured data: improves measurement accuracy and efficiency.
Support multi-scale measurement format: Supports measurement formats from 4mm to 4m, and can be customized and expanded.
technical indicators
Measurement accuracy: Some models can achieve micrometer level measurement accuracy, such as digital camera systems with a measurement accuracy of 0.015mm/m.
Drone flight altitude: In aerial surveying, the maximum flight altitude of a drone can reach 300 meters.
Application field
Industrial dimension testing: used in the fields of automotive, aerospace, shipbuilding, etc., to detect the size and shape accuracy of components.
Material mechanics analysis: Analyze the deformation and strain of materials during the process of stress.
Vegetation coverage measurement: In ecology and environmental science, measuring vegetation coverage is used to evaluate the quality of the ecological environment.
Aerospace surveying: Generate true 3D models to provide accurate geographic information for the aerospace field.