Integrated method for measurement and reconstruction of three-dimensional model and system thereof

Abstract

The invention relates to an integrated method for the measurement and reconstruction of a three-dimensional model and a system thereof. The method comprises the following steps: 1) obtaining the three-dimensional coordinates of surface markers of an object sample; 2) interactively constructing the three-dimensional model based on the three-dimensional coordinates. The method integrates measurement and reconstruction as a whole and simplifies an inverse reconstruction process of the three-dimensional model to benefit for the rapid inverse reconstruction of the object sample and to avoid complex secondary measurement (supplement measurement) and guarantee the integrity of the reconstructed model. Color and texture information of surfaces of the samples can be reconstructed, data volume of the reconstructed model is small and is suitable for being used under network environment. Repeated measure can be effectively avoided to improve the efficiency of measurement and reconstruction. A measuring apparatus has the advantages of small volume, light weight and convenient motion. The design intent of the model can be fully considered in the measurement and reconstruction process in favor of measurement planning.

Description

technical field [0001] The invention relates to an integrated method and system for measuring and reconstructing a three-dimensional model. Background technique [0002] The technique of generating a 3D model of a product from a physical sample is usually called reverse design or reverse reconstruction. see figure 1 , reverse reconstruction usually includes two main steps: 1) measurement of physical samples; 2) reconstruction of 3D model. The process of using various measuring equipment to obtain the surface data of the physical sample is called the measurement of the physical sample; the process of using the measurement data as input to generate a three-dimensional model acceptable to the computer-aided design (CAD) system is called the reconstruction of the three-dimensional model. [0003] Inverse reconstruction is widely used in manufacturing, medicine, geographic information system, virtual reality and other fields. The goal of reverse reconstruction in the manufactu...

AI Technical Summary

Problems solved by technology

Its disadvantages are: 1) The laser spot scans the measurement space according to a fixed pattern, resulting in a large number of repeated scans; 2) The color and texture information of the sample surface cannot be obtained; 3) The number of measurement points obtained is large, which is not suitable for the network environment Use; 4) The measurement process does not consider the design intent of the model, making measurement planning difficult

Its disadvantages are: 1) It is necessary to scan the physical sample in a certain order, and a large number of areas will be scanned repeatedly; 2) It needs to be connected to the mechanical arm, and the measurement accuracy is affected by the connected equipment; 3) It is impossible to obtain the color and color of the sample surface. Texture information; 4) The number of measurement points obtained is large, which is not suitable for use in a network environment; 5) The measurement process does not consider the design intention of the model, and the measurement planning is difficult

The disadvantages are: 1) the color and texture information of the sample surface cannot be obtained; 2) the measurement data from different angles must be repeated, resulting in repeated measurement; 3) the number of measurement points obtained is large, which is not suitable for use in a network environment; 4 ) The measurement process does not consider the design intent of the model, making measurement planning difficult

Its disadvantages are: 1) Stereo vision is the transformation from two-dimensional to three-dimensional information of an object, which is actually a pathological problem with an uncertain solution; Many problems still need to be further researched and solved, and commercialization is difficult; 3) The amount of calculation is large, and it is not suitable for real-time and online measurement is another shortcoming of the stereo vision method

Its disadvantages are: 1) The CMM equipment is large in size and poor in portability, and is only suitable for use in the manufacturing field, not for civilian use; 2) The moving speed of the CMM probe is slow, and the measurement efficiency is low compared with optical measurement; 3) The CMM In the system, stereo vision is only used to obtain the outline of the model, and the measurement planning process cannot be completed automatically; 4) The number of measurement points obtained is large, which is not suitable for use in a network environment; 5) In the outline area, there is still the phenomenon of repeated scanning

Its disadvantages are: 1) measurement data from different angles must be repeated, resulting in repeated measurement; 2) the number of measurement points obtained is large, which is not suitable for use in a network environment; 3) it is difficult to truly solve the automatic planning problem of structured light measurement

Its disadvantages are: 1) The CMM equipment is bulky and poor in portability, and is only suitable for use in the manufacturing field, not for civilian use; 2) The moving speed of the CMM probe is slow, and the measurement efficiency is low compared with optical measurement; 3) The In the system, stereo vision is only used to obtain the outline of the model, and the measurement planning process cannot be completed automatically; 4) The color and texture information of the sample surface cannot be obtained

Its disadvantages: 1) The resolution of the video is low, and the accuracy of the reconstruction model is low; 2) It depends on the surface texture of the object, and it is difficult to deal with the physical samples with changes in color and shade; 3) The video shooting can only be completed once ), if the part of the model is not photographed, the part cannot be reconstructed; 4) There is still a sequential relationship between measurement (camera) and reconstruction (interactive modeling), and it is difficult to deal with omissions

However, the existing systems often ensure the accuracy and completeness of the measurement data by increasing the sampling density, so that the obtained measurement data is very large

The huge amount of data requires more computing resources, reduces the transmission and reconstruction efficiency of measurement data, and is difficult to meet the needs of rapid reverse reconstruction in geographic information systems, virtual reality and other fields

[0018] 2. In the existing system, the measurement and reconstruction process are only related by the measurement data. Once the measurement data is incomplete due to omissions in the measurement process, the reconstructed 3D model must be incomplete.

However, the existing system treats measurement and reconstruction as two independent processes and processes them separately, which does not conform to the essential relationship between measurement and reconstruction.

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