Mr. Hongcan Guan Profile

Hongcan Guan

at Institute of Botany

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Proceedings Article | 9 September 2019 Presentation + Paper

An elevation correction method for colored point cloud in building areas

Mei Zhou, Hongcan Guan, Geer Teng, Chuanrong Li, Hui Jing Zhang, Jiuying Chen, Lian Ma, Wei Li

Proceedings Volume 11127, 1112712 (2019) https://doi.org/10.1117/12.2525363

KEYWORDS: Clouds, Image fusion, 3D image processing, LIDAR, Feature extraction, Charge-coupled devices, Sensors, Image processing, Image sensors, Image classification

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Generating colored point cloud by the fusion of CCD images and point cloud data can exert both of their superiorities sufficiently, which has been a major method to obtain spatial information of the buildings for building reconstruction, object detection and other applications. Airborne LiDAR and CCD cameras are usually combined on one platform to carry out colored point cloud based on registration. In addition, there is also a new 3D imaging sensor that can acquire point cloud and CCD images with a stable relationship by the mechanism of common optical system, which could generate colored point cloud faster than the former. In the process of fusion, the colored point cloud is possible to absence some building information such as corners and boundaries. Interpolation is an optimistic method to solve the above issue. However, due to the unclear boundaries between building and ground in the point cloud data, the elevation error of the building area is large after interpolation. Therefore, a correction method for the elevation of colored point cloud in building area is proposed in this paper by combining point cloud contour extraction, image region merging and contour regularization. The new method can accurately obtain the edge of the building by the using of stable relationship, thus reducing the elevation interpolation error of the colored point cloud. The effectiveness of the method is validated based on the flight test data of 3D imaging sensor. The accuracy is improved by 33% after elevation correction.

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