A block-wise polynomial distortion model for airborne composite large-format camera

doi:10.11947/j.AGCS.2025.20240273

Abstract

Abstract:

The airborne composite large-format camera has gained widespread popularity in remote sensing and surveying due to its high resolution and wide coverage. However, various complex distortions arise during the imaging process owing to factors such as manufacturing processes and assembly precision, which impact image quality and the accuracy of geometric processing. This paper proposes a block-wise polynomial distortion model tailored to the characteristics of mosaic aerial frame cameras. The core idea of this model is to divide the imaging plane into multiple sub-image blocks guided by the residual vector field from Brown's distortion model calibration, and describe distortions within each sub-block using polynomials, thereby effectively correcting various complex distortions. Additionally, a cloud-controlled calibration scheme is designed to solve for the block-wise polynomial parameters. Taking the AFC-900 camera developed by the Beijing Institute of Aerospace Mechatronics as the research subject, the paper conducted cloud-controlled calibration of the camera in Zhaodong. Subsequently, production verification was carried out in three survey areas: Zhaodong, Jiexiu, and Miluo. The results demonstrate that the distortion model proposed in this paper can correct distortions in the AFC-900 camera to within 0.5 pixels, and the accuracy of the production outcomes meets the specifications for large-scale mapping at scales of 1∶500 and 1∶2000.

Key words: airborne composite large-format camera, distortion model, block-wise polynomial, cloud-controlled calibration

CLC Number:

P231

Zuxun ZHANG, Xinbo ZHAO, Yansong DUAN. A block-wise polynomial distortion model for airborne composite large-format camera[J]. Acta Geodaetica et Cartographica Sinica, 2025, 54(1): 52-63.

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属性	值
全色幅面/像素	30 480×28 820
全色像素大小/μm	4.6
全色焦距/mm	142
多光谱幅面/像素	7920×6004
多光谱像素大小/μm	4.6
多光谱焦距/mm	37

属性		参数值
航带数		7
成功平差影像数		413
连接点中误差/像素		0.5
控制点重投影中误差/像素		0.3
检查点精度	平面精度/m	0.048
检查点精度	高程精度/m	0.05

模型	参数数量	迭代次数	重投影误差/像素
严密模型	102	34	1.202
分块模型	216 060	12	0.462

肇东测区	分块大小
肇东测区	32	64	128	256
云控制检校重投影误差	0.83	0.63	0.46	0.86
区域网平差重投影误差	1.01	1.05	0.51	0.98

肇东测区	多项式阶数
肇东测区	1	2
云控制检校重投影误差	0.46	0.44
区域网平差重投影误差	0.51	0.75