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I need to explain the pinhole camera model and the figure in the Camera Calibration and 3D Reconstruction page is the perfect illustration:

It is from the page:

OpenCV: Camera Calibration and 3D Reconstruction

Do I need to ask for permission to use this figure? If so, where should I look for help?

Thanks a lot.

I need to explain the pinhole camera model in my research paper and the figure in the Camera Calibration and 3D Reconstruction page is the offers perfect illustration:

It is from the page:

OpenCV: Camera Calibration and 3D Reconstruction

Do I need to ask for permission to use this figure? If so, where should I look for help?

Thanks a lot. lot.