Lecture 2 Flashcards
What is an Aperture
The space through which light passes into a camera
What is the purpose of the barrier inside a camera
Prevents multiple light rays from one point on the 3D object from entering the camera.
Establishes a one-to-one mapping
What is the pinhole camera model?
A simple model that follows this image capturing method of establishing a one-to-one mapping
What is the Focal Length in relation to a camera?
The distance between the image plane and the pinhole (aperture)
What is the Focal Length in relation to the pinhole camera model?
The distance between the image plane and the pinhole (aperture)
What is the optical axis in relation to this camera pinhole camera model?
The line between the pinhole’s projection on the image plane and the pinhole itself.
What is the camera reference system?
Used to define a coordinate system [i j k] centered at the pinhole O such that the axis k is perpendicular to the image plane and points toward it.
What happens as the aperture size increases?
As it increases, it allows more light rays to pass through it and thus increases the chances of producing a blurred image.
What are lenses used for?
Used to mitigate the conflict between crispness and brightness
How do lenses work?
Rays of light emitted by point P on a 3D object are refracted by the lens so that they converge to a single point P’ on the image plane
Points at differing distances from the lens will emit rays that wont converge perfectly on the film. These points will be out of focus.
What is the Depth of Field?
The effective range at which cameras can take clear photos (specific distance at which the object will be in focus)
What is the focal point?
The point where all light rays travelling parallel to the optical axis area focus in on.
What is the focal point?
The point where all light rays travelling parallel to the optical axis area focus in on.
