Auto-focusing method and photographic device

Abstract

The invention provides an auto-focusing method and a photographic device. The auto-focusing method comprises the following steps: an analog focusing system and a digital focusing system are built in the photographic device; and at least one of the analog focusing system and the digital focusing system is used for focusing during camera shooting or picture taking. According to the invention, analog filtering and digital filtering are performed on images acquired by camera shooting or picture taking, the advantages of the two focusing systems are felicitously combined, so that objects can be quickly and accurately determined to be focused, thereby realizing auto-focusing performance quickly and accurately.

Description

technical field

[0001] The present invention relates to the technical field of imaging, in particular to an automatic focusing method and an imaging device. Background technique

[0002] In order to enable the lens to achieve auto-focus, in the prior art, a sharpness evaluation value (Evaluation) generated by the signal of the image itself when shooting or taking pictures is generally used as the basis for auto-focus judgment. This sharpness evaluation value is based on the image. The signal is obtained by calculating the high and low frequency components generated after passing through the Pass Filter. When the zoom lens moves, the high and low frequency component values ​​corresponding to each focus position will form a function curve, and there is a relative maximum peak value on this function curve, and the focus position corresponding to the maximum peak value is the focus of the camera device. This function The curve is the sharpness evaluation function curve. [000...

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