What is autofocus?
Q: What is autofocus?
A: Autofocus is a procedure used to find the correct position of the lens for a scene.
Q: What components can be included in a system with autofocus?
A: A system with autofocus can include a movable optical element, a motor, an image sensor, and a processing unit.
Q: How is the autofocus procedure done?
A: The autofocus procedure is done by changing the lense position and measuring image quality in each position. The position that provides the image with the best quality is used as the best focus.
Q: How can image quality be estimated for autofocus?
A: Image quality can be estimated using image gradients.
Q: How is autofocus speeded up?
A: Autofocus is sped up by doing it in two steps. The first uses a significant step over the full range of the lens movement to provide an estimated position. The second run uses a small step over a small range to improve the position.
Q: How can the accuracy of autofocus results be improved?
A: Interpolation between the few best positions may improve the accuracy of autofocus results.
Q: What is the importance of autofocus?
A: Autofocus is important because it allows for the correct position of the lens to be found for a scene, resulting in better image quality.
