AUTO FOCUS METHOD AND AUTO FOCUS APPARATUS

摘要

An auto focus (AF) method and an AF apparatus are provided. The method includes the following steps. At least one target object is selected and photographed by a first image sensor and a second image sensor to generate a three-dimensional (3D) depth map. A block covering at least one initial focusing point is selected. The 3D depth map is queried for reading depth information of a plurality of pixels in the block. It is determined whether depth information of the pixels is enough to operate. If yes, a first statistics operation is performed, and focusing depth information is obtained. If not, the position of the block is moved or the size of the block is enlarged to obtain the focusing depth information. A focusing position is obtained according to the focusing depth information and the AF apparatus is driven to perform an AF procedure according to the focusing position.

主权项

1. An auto focus (AF) method, adapted to an AF apparatus which has a first image sensor and a second image sensor, the AF method comprising:
selecting at least one target object and photographing the at least one target object by the first image sensor and the second image sensor to perform a procedure of three-dimensional (3D) depth estimation, so as to generate a 3D depth map; selecting a block covering at least one initial focusing point according to the at least one initial focusing point of the at least one target object; querying the 3D depth map for reading pieces of depth information of a plurality of pixels in the block; determining whether the pieces of depth information of the pixels is enough to operate, if yes, performing a first statistics operation on the pieces of depth information of the pixels to obtain a piece of focusing depth information, and if not, moving the position of the block or enlarging the size of the block to obtain the piece of focusing depth information; and obtaining a focusing position regarding the at least one target object according to the piece of focusing depth information, and driving the AF apparatus to perform an AF procedure according to the focusing position.