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1 Camera Geometry
What is camera geometry about?Considers the shape when we project our 3D world onto a 2D image.
What is the focal point in the pinhole model?The point in the pinhole camera where the light passes through.
How does the
focallength in the pinhole model describe?It is the distance of the imageplane to the focalpoint.
What are the
drawbacksof a pinholecamera model and how do modern digital camera'scounter that?It doesn't let much light through, so it requires a long exposure time. And it can't zoom.
camera'suse lensesto obtain larger area for light to pass through, so it requires a lower exposure time. And additionallycan zoom.
What is the orthographic projection?Simply drop one
dimension, the depth to be precise
How does the orthographic projection differ from the perspective projection?Depth doesn't affect the projection.
What is the camera matrix of a camera model?The matrix to apply to transform a 3D world coordinate into a 2D image plane coordinate.
Of what two parts do we deconstruct the camera matrix of a camera model?The extrinsinc parameters and the intrinsic parameters.
What do the extrinsic parameters of a camera matrix consist of?Rotation and translation to convert a point in 3D world coordinates into 3D camera coordinates.
How to extract extrinsic parameters for the camera matrix with knowledge of 3D camera position in relation to origin of the world coordinate system?
- Rotate in such that world origin is oriented like camera
- Translate in such that world origin is located at camera