Close Focus with GPU

摘要

Disclosed are systems and methods for focusing a digital camera to capture a scene. It is first detected that a change in a scene requires the digital camera to be focused or refocused. The camera focus is automatically scanned from a closest settable distance to farther distances until a first closest object in the scene is detected. Once the first closest object in the scene is detected, the camera focus is set at the distance of the first closest object and a finer scan is executed. In an embodiment, a dynamic movement threshold is calculated and used to determine that the change in scene requires the digital camera to be focused or refocused.

主权项

1. A method for auto focusing a digital camera on a scene, the method comprising:
determining that a change in the scene requires that the digital camera be refocused; automatically setting a focus distance of the digital camera to a lowest available distance; dividing the scene into multiple sub-frames, incrementally increasing the focus distance at a first increment without user intervention and determining a focus value at each increment for each sub-frame and for the entire scene; automatically resetting the focus distance of the digital camera to a fine scan start point corresponding to a closest focus value peak in one or more sub-frames if the closest focus value peak for the one or more sub-frames is closer than a focus value peak for the entire scene, and otherwise setting the fine scan start point to the focus value peak for the entire scene; and executing a first final scan from the final scan start point at a second increment, the second increment being smaller than the first increment.