Depth-segmenting peak tracking autofocus

摘要

An apparatus, method, and computer readable medium related to autofocusing a camera lens system. An initial image is captured at a first lens position and focus information is extracted with respect to a first plurality of focus windows. A second image is captured at a second lens position and focus information is extracted for a second plurality of focus windows that correspond to the first plurality of focus windows in the initial image. The focus information for corresponding windows is compared to determine whether the focus status in each window is improving or degrading; this determination reveals whether the lens is positioned in a desirable position with respect to the data revealed by the data extracted from the focus windows.

主权项

1. A camera focus method comprising:
receiving, by a computer, a first image from a camera arrangement with a camera lens positioned in a first position, wherein the camera arrangement is integral with the computer; extracting from the first image first focus information, where first focus information comprises a first value for each of focus windows; storing the first focus information as associated with the first lens position; moving the camera lens to a second position; receiving, by the computer, a second image from the camera arrangement with the camera lens positioned in the second position; extracting from the second image second focus information, where second focus information comprises a second value for each of the focus windows, wherein each second value corresponds to one of the first values; storing the second focus information as associated with the second lens position; comparing, a plurality of first values with the corresponding second values to determine a plurality of relative values, where each relative value indicates whether moving the camera lens to the second position corresponds to a first direction that approaches or a second direction that moves away from a maximum focus position for each of the focus windows; and determining whether a number of focus windows with relative values associated with the first or second direction satisfy a pre-defined standard for determining an autofocus lens position.