3D Image Recording Unit for Noncontact Coordinate Measurement
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Solution Overview
Problem
Existing 3D image recording systems face limitations in achieving precise and rapid noncontact coordinate measurements on large objects due to the need for multiple reference markings and the inability to change positions without intermediate recordings, leading to reduced accuracy and increased computational resources.
Innovation Solution
A method utilizing a 3D image recording unit that records three-dimensional images from a single position and orientation without changing its position or orientation, using an external measuring apparatus to determine the object's coordinate system, allowing for direct referencing and combining of non-cohesive area sections without intermediate recordings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple reference markings and intermediate recordings are used to change positions, then measurement coverage can be extended, but measurement precision deteriorates due to accumulated errors
Solution Approach 1:
The patent introduces an external measuring apparatus as an intermediary device that independently determines the position and orientation of the 3D image recording unit. This external measurement system acts as a mediator between the recording unit and the coordinate system, providing accurate referencing without requiring intermediate recordings or multiple reference markings on the object surface.
Solution Approach 2:
The patent segments the measurement system into two independent parts: the 3D image recording unit that captures images and the external measuring apparatus that determines position and orientation. This segmentation allows each component to perform its function optimally without the constraints of using multiple reference markings across different positions.
2Area of stationary object
If multiple intermediate recordings are made to connect area sections, then spatial coverage is extended, but measurement time and computational resources increase
Solution Approach 1:
The external measuring apparatus performs preliminary determination of the 3D image recording unit's position and orientation before image capture. By pre-establishing the coordinate transformation parameters through this external measurement device, the system eliminates the need for time-consuming intermediate recordings and subsequent computational matching processes.
3Productivity
If the 3D image recording unit changes position without intermediate recordings, then productivity increases, but measurement precision deteriorates due to loss of reference
Solution Approach 1:
The patent replaces the mechanical/reference-based positioning system (requiring physical reference markings and intermediate recordings) with an external measurement apparatus that uses optical or electromagnetic fields to non-contactedly determine position and orientation. This substitution enables rapid position changes while maintaining precision through field-based measurement rather than mechanical referencing.
Data Source
AI summary
The invention relates to a method and a surveying system for noncontact coordinate measurement on the object surface of an object to be surveyed in an object coordinate system. With a 3D image recording unit, a first three-dimensional image of a first area section of the object surface is electronically recorded in a first position and first orientation, the first three-dimensional image being composed of a multiplicity of first pixels, with which in each case a piece of depth information is coordinated. The first position and first orientation of the 3D image recording unit in the object coordinate system are determined by a measuring apparatus coupled to the object coordinate system. First 3D object coordinates in the object coordinate system are coordinated with the first pixels from the knowledge of the first 3D image coordinates and of the first position and first orientation of the 3D image recording unit.