公开(公告)号：US09030591B2

公开(公告)日：2015-05-12

申请号：US13708361

申请日：2012-12-07

申请人： Apple Inc.

发明人： Robin B. Jenkin ,  Eugene Lam

IPC分类号： G03B13/00 ,  H04N5/232

CPC分类号： H04N5/23212

摘要： An in-focus lens position may be determined by computing a focus metric value, by counting the number of transition pixels for images of a target captured at different lens positions. Using as little as two frames to compute two focus metric values, a reasonable approximation of the in-focus lens position may be obtained. The approximation of the in-focus lens position may then be used as a starting point for a fine focus search process, to determine an in-focus lens position. An advantage here is that the focus metric values relate to the number of transition pixels and are easy to compute, and yield a reasonable approximation of the in-focus position with just a few frames. Other embodiments are also described.

摘要翻译： 通过计算在不同透镜位置处捕获的目标的图像的转换像素的数量，可以通过计算焦点度量值来确定对焦透镜位置。 使用少至两帧来计算两个焦点度量值，可以获得对焦透镜位置的合理近似。 然后可以将对焦透镜位置的近似值用作微小焦点搜索处理的起始点，以确定对焦透镜位置。 这里的优点是焦点度量值与转换像素的数量有关，并且易于计算，并且仅仅使用几帧就可以合理地估计对焦位置。 还描述了其它实施例。

公开(公告)号：US20140022441A1

公开(公告)日：2014-01-23

申请号：US13708361

申请日：2012-12-07

申请人： APPLE INC.

发明人： Robin B. Jenkin ,  Eugene Lam

IPC分类号： H04N5/232

CPC分类号： H04N5/23212

摘要： An in-focus lens position may be determined by computing a focus metric value, by counting the number of transition pixels for images of a target captured at different lens positions. Using as little as two frames to compute two focus metric values, a reasonable approximation of the in-focus lens position may be obtained. The approximation of the in-focus lens position may then be used as a starting point for a fine focus search process, to determine an in-focus lens position. An advantage here is that the focus metric values relate to the number of transition pixels and are easy to compute, and yield a reasonable approximation of the in-focus position with just a few frames. Other embodiments are also described.

摘要翻译： 通过计算在不同透镜位置处捕获的目标的图像的转换像素的数量，可以通过计算焦点度量值来确定对焦透镜位置。 使用少至两帧来计算两个焦点度量值，可以获得对焦透镜位置的合理近似。 然后可以将对焦透镜位置的近似值用作微小焦点搜索处理的起始点，以确定对焦透镜位置。 这里的优点是焦点度量值与转换像素的数量有关，并且易于计算，并且仅仅使用几帧就可以合理地估计对焦位置。 还描述了其它实施例。