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。

公开(公告)号：US20140198995A1

公开(公告)日：2014-07-17

申请号：US14156327

申请日：2014-01-15

Applicant: STMICROELECTRONICS S.r.I.

Inventor： Danilo Pietro PAU ,  Arcangelo Ranieri BRUNA ,  Ettore NAPOLI ,  Giorgio LOPEZ

IPC: G06T3/40

CPC classification number: G06T3/4092 ,  G06F17/30247 ,  G06K9/00986 ,  G06K9/4671 ,  G06K9/527 ,  G06T3/4084

Abstract: An embodiment of a method for computing pyramids of input images (I) in a transformed domain, e.g., for search and retrieval purposes, includes:—arranging input images in blocks to produce input image blocks,—subjecting the input image blocks to block processing including: transform into a transformed domain, subjecting the image blocks transformed into a transformed domain to filtering, subjecting the image blocks transformed into a transformed domain and filtered to inverse transform implementing an inverse transform with respect to the previous transform into a transformed domain, thus producing a set of processed blocks. The set of processed blocks, which is recomposeable to an image pyramid, may be used, e.g., in detecting extrema points in images in the pyramid, extracting a patch of given size around the extrema points detected, and processing the patch to obtain local descriptors such as SIFT descriptors of a feature.

Abstract translation: 用于计算变换域中的输入图像（I）的棱锥的方法的实施例，例如用于搜索和检索目的，包括： - 以块为单位布置输入图像以产生输入图像块， - 输入输入图像块以阻止处理 包括：变换为变换域，对经变换的域进行滤波，对变换后的图像块进行变换后进行逆变换，将前一变换的逆变换实现为变换域， 产生一组加工块。 可以使用可重构为图像金字塔的处理块的集合，例如，在检测金字塔中的图像中的极值点时，在检测到的极值点处提取给定大小的块，并且处理该补丁以获得局部描述符 例如功能的SIFT描述符。