公开(公告)号：US20150002703A1

公开(公告)日：2015-01-01

申请号：US14319858

申请日：2014-06-30

Applicant: STMicroelectronics S.r.I.

Inventor： Salvatore CURTI ,  Arcangelo Ranieri BRUNA

IPC: H04N5/232 ,  G02B13/00

CPC classification number: H04N5/23212 ,  G02B13/009 ,  H04N5/23296

Abstract: In an embodiment, focusing an image-capture device such as, e.g., a camera including an optical system displaceable in opposite directions (A, B) via a focusing actuator, is controlled by evaluating a scale factor for the images acquired by the device. An accumulated value of the variations of the scale factor over a time interval (e.g., over a number of frames) is produced and the absolute value thereof is compared against a threshold. If the threshold is reached, which may be indicative of a zoom movement resulting in image de-focusing, a refocusing action is activated by displacing the optical system via the focusing actuator in the one or the other of the opposite focusing directions (A or B) as a function of whether the accumulated value exhibits an increase or a decrease (i.e., whether the accumulated value is positive or negative).

Abstract translation: 在一个实施例中，通过评估由装置获取的图像的比例因子来控制诸如例如包括通过聚焦致动器在相反方向（A，B）可移位的光学系统的照相机的图像捕获装置的聚焦。 产生在时间间隔（例如，多个帧数）上的比例因子的变化的累积值，并将其绝对值与阈值进行比较。 如果达到阈值，其可以指示导致图像去聚焦的变焦移动，则通过在相对的聚焦方向（A或B中的一个或另一个）中的聚焦致动器移位光学系统来激活重新聚焦动作 ）作为累加值是否呈现增加或减少（即，累积值是正还是负）的函数。