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• ### 1 Camera Geometry

This is a preview. There are 10 more flashcards available for chapter 1

• #### 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 focal length in the pinhole model describe?

It is the distance of the image plane to the focal point.
• #### What are the drawbacks of a pinhole camera model and how do modern digital camera's counter that?

It doesn't let much light through, so it requires a long exposure time. And it can't zoom.
Digital camera's use lenses to obtain larger area for light to pass through, so it requires a lower exposure time. And additionally can 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