A phase order error compensation method based on region growing
A technology of area growth and compensation method, applied in the field of optical measurement, which can solve problems such as phase order errors
Active Publication Date: 2020-10-20
南京理工大学智能计算成像研究院有限公司
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However, after the phase extraction and phase unwrapping operations, there are often some small amount of phase order errors in the obtained initial absolute phase map
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[0026] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, not to limit the present application.
[0027] Such as Figure 1~3 As shown, this embodiment is a phase-order error compensation method based on region growth, which only needs an initial absolute phase map to realize phase-order error compensation, and this method includes three steps.
[0028] step one. For an initial absolute phase map, traverse each valid point on the phase map, and perform group processing on the absolute phase map according to the absolute phase difference between adjacent pixels to obtain a segmentation map.
[0029] For an initial absolute phase map Φ c (x,y) , constructing a binary mask map Mask...
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The present invention discloses a phase order error compensation method based on region growth, and the steps are as follows: for an initial absolute phase map, traverse each valid point on the phase map, and calculate the The absolute phase image is grouped to obtain a segmented image; starting from the group with the largest number of pixels in the segmented image, the phase correction operation is performed on its adjacent groups and merged into one group. After all adjacent groups are processed, the group The region where it is located is moved out of the segmentation map; continue to perform phase correction operations on the group with the largest number of pixels in the updated segmentation map until all pixels in the segmentation map are cleared. The present invention only needs an initial absolute phase diagram to realize phase-order error compensation, and is a fully automatic, relatively low-cost and relatively efficient phase-order error compensation algorithm, which can correctly compensate for errors in the absolute phase diagram. Some mismatched areas provide a guarantee for obtaining high-integrity 3D reconstruction results.
Description
technical field [0001] The invention relates to the technical field of optical measurement, in particular to a phase order error compensation method based on area growth. Background technique [0002] 3D shape measurement based on fringe projection plays an important role in industrial manufacturing, rapid reverse engineering, quality control, biomedicine and other fields. However, after the phase extraction and phase unwrapping operations, there are often some small amount of phase order errors in the obtained initial absolute phase map. In the phase order error compensation method based on region growth proposed in this paper, some mismatched regions in the absolute phase map are correctly compensated, thus obtaining high-integrity 3D reconstruction results. Contents of the invention [0003] The purpose of the present invention is to provide a phase order error compensation algorithm with low calculation cost and relatively high efficiency, specifically a phase order e...
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IPC IPC(8): G06T15/00G06T5/20G06T7/10
CPCG06T5/20G06T7/10G06T15/00G06T2207/10012
Inventor 张晓磊左超沈德同
Owner 南京理工大学智能计算成像研究院有限公司