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Automatic focusing method and device

A technology of automatic focus and focus position, which is applied in the computer field, can solve problems such as inaccurate focus, and achieve the effect of avoiding interference and improving accuracy

Active Publication Date: 2018-04-06
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of this, the present application provides an automatic focusing method and device to solve the technical problem of inaccurate focusing in the scene where there are false peaks in the focusing curve

Method used

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  • Automatic focusing method and device

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Embodiment Construction

[0039] The automatic focusing method provided by the embodiment of the present invention mainly divides the image to be shot into M*N sub-regions (such as image 3 shown), during the adjustment process of the focus motor, a focus curve of focus position and sharpness evaluation value is formed for each sub-area, and there are total M*N focus curves of sub-areas and a focus curve of an overall picture. Then, analyze the focusing curve of each sub-region, determine the effective sub-region whose slope of the curve conforms to the sharp rise and sharp drop, and use the focus position of the effective sub-region as the focus position of the entire image, so as to avoid the focus curve of the entire image from false peaks to focus caused interference.

[0040] The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but n...

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Abstract

The invention provides an automatic focusing method. The method comprises the following steps: dividing an image to be photographed into M*N sub-areas, and acquiring low-frequency sharpness evaluationvalues corresponding to the M*N sub-areas in a current focusing position; obtaining the number X of the sub-areas, of which a low-frequency focusing curve meets a sharp rise condition, and the numberY of the sub-areas, of which the low-frequency focusing curve meets a sharp decline condition, in each focusing zone through statistics; if X is larger than Y in a certain focusing zone I, continuingto judge whether X is larger or smaller than Y in the focusing zone I+1; and if Y is larger than X in the focusing zone I+1, determining that a focusing position i+1 is a low-frequency sharp focusingposition. The method provided by the invention has the advantages that the effective sub-areas are determined according to the low-frequency sharpness evaluation values of the sub-areas of the imageto be photographed, and the focusing positions of the effective sub-areas are used as focusing positions of the whole image, so that interference on focusing from false wave crests in a focusing curveof the whole image is avoided, and the image focusing accuracy in an application scenario where multiple peaks exist in the focusing curve is further improved.

Description

technical field [0001] The invention belongs to the field of computer technology, and in particular relates to an automatic focusing method and device. Background technique [0002] Autofocus technology means that the lens automatically adjusts the focus of the photographed object to obtain the clearest image. It is widely used in video cameras, digital cameras, and mobile terminals with camera functions. [0003] Autofocus technology includes active focusing and passive focusing. This article involves passive focusing. Passive focusing collects images through a lens and an image sensor, and performs computer analysis on each frame of image to determine the distance of the subject. The camera actually moves the lens back and forth across the scene to search for the best focus. [0004] The passive autofocus algorithm mainly finds the focus position by analyzing the focus curve corresponding to the image, and the focus curve mainly reflects the relationship between the focus...

Claims

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Application Information

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IPC IPC(8): H04N5/232
CPCH04N23/67H04N23/60
Inventor 林一育
Owner HUAWEI TECH CO LTD
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