Extract part of the plane by simulating a camera view

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Lorenzo Aldrighetti 2017-4-27

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https://ww2.mathworks.cn/matlabcentral/answers/337644-extract-part-of-the-plane-by-simulating-a-camera-view

回答： Will Nitsch 2017-5-1

Hi to everyone, I'm try to extract a portion of a 3D plane in order to simulate a video camera view.

For example, I have generate a random x,y and z plane (like a ground). I suppose to have a moving camera that face down respect to the plane at a certain height. How i can project the camera view in order to extract only a portion of plane that the camera see, supposing to have a certain focal length? My plane is define with 3 2x2 matrices, I attach an example

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Answer 1

Will Nitsch 2017-5-1

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https://ww2.mathworks.cn/matlabcentral/answers/337644-extract-part-of-the-plane-by-simulating-a-camera-view#answer_265256

Since in MATLAB you can know/define a camera object's position, viewing angle and camera target position (for more information on these, see the 'View' section of 'Axes Properties' documentation), you could do a bit of math to determine what data points fall within the 3D-2D projection and then extract them from the data set.

Axes 'View' Properties:

https://www.mathworks.com/help/matlab/ref/axes-properties.html#zmw57dd0e57677

Some more information on imaging geometry that could be useful:

http://www.cse.psu.edu/~rtc12/CSE486/lecture12.pdf