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Auto-focusing method and photographic device

A technology of auto-focus and camera device, applied in the field of photography, can solve the problems of inaccurate auto-focus of analog focus or digital focus, and achieve the effect of auto-focus and accurate auto-focus

Active Publication Date: 2015-06-17
SHENZHEN ADVANCE RIVER SYST TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem mainly solved by the present invention is to provide an autofocus method and a camera device to solve the problem that the single use of analog focus or digital focus in the prior art cannot accurately and quickly complete autofocus

Method used

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  • Auto-focusing method and photographic device
  • Auto-focusing method and photographic device
  • Auto-focusing method and photographic device

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Embodiment Construction

[0017] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0018] figure 1 It is a flow chart of an embodiment of the autofocus method of the present invention. like figure 1 As shown, the autofocus method includes the following steps:

[0019] Step S101: building an analog focusing system and a digital focusing system in the camera device;

[0020] Among them, the digital focusing system uses high-frequency filters and low-frequency filters. When taking pictures or taking pictures, it judges the number of high-frequency and low-frequency, and takes the highest point of high-frequency and low-frequency values. There are two focus windows when focusing, one One is the full-screen focus window, and the other is a smaller focus window in the middle of the full-screen focus window. The size of this focus window can be set by software to achieve more precise focus.

[0021] The analog focusing system uses a hi...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/232G03B13/36G02B7/36G03B30/00
Inventor 成文俊
Owner SHENZHEN ADVANCE RIVER SYST TECH CO LTD
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