CN103327254A - Automatic focusing method and focusing system thereof - Google Patents

Abstract

The invention discloses an automatic focusing method which comprises the following steps of (A) capturing image data obtained by a camera; (B) carrying out eye detection on the image data; (C) judging whether an eye is detected in the image data, If not, going to the step (A); if so, then entering into a step (D); (D) determining the corresponding center point position according to the position of the eye; (E) judging whether the position of the center point is needed to be refocused, if not, ending the step; if so, entering into a step (F); and (F) carrying out focusing automatically according to the position of the center point and storing the position as a new focusing center coordinate, and ending the step. By employing the above scheme, the eye in the image data is detected directly, and the failed focusing caused by the obtainment of a high frequency signal is avoided.

Description

A kind of Atomatic focusing method and focusing system

Technical field

The present invention relates to a kind of Atomatic focusing method and focusing system.

Background technology

Recently, along with the development of digital camera, mobile phone cam, become universal phenomenon so that take pictures.In general, the Shi Weineng that takes pictures highlights main body, so all can focus.Present most camera and mobile phone all possess the function of automatic focusing.

About in the Atomatic focusing method just like Chinese patent: ZL200810135623.4 discloses a kind of face automatic focusing method of digital image capture device.In this invention, mainly be to provide a kind of Atomatic focusing method of digital image capture device, digital image capture device focus during, focusing area can extend along people's face to the health direction to be contained more than the chest at least, so as to containing the high-frequency signal of neck span and clothes decorative pattern.

This inventive method has the following disadvantages: mainly be the high-frequency signal that calculates the focusing form in each digitized video in (1) said method; Obtain maximum from high-frequency signal; With the focusing mirror group of digital image capture device move to maximum the lens location of corresponding object distance, to finish focusing.When if the color of clothes just is the signal of high frequency in this situation, can cause focusing to clothes, rather than we the people on the face, so just causing our people's face is not main part, and clothes becomes main body, this just is equivalent to focus unsuccessfully.(2) can not carry out real-time preview in the said method, go again capture digital image but obtain first be bold little information, people's face positional information and azimuth information of people, carry out again final automatic focusing according to whether when last image, can cause and take pictures and the inconsistent problem of the effect of preview.

Summary of the invention

For solving the technical problem that exists in the prior art, the invention provides a kind of Atomatic focusing method based on eye detection and focusing system.When the color that solves the clothes that exists in the prior art was the signal of high frequency, the wrong situation of focus focusing can not appear yet, and the perfect real-time of focusing, solved preview and the inconsistent problem of effect of taking pictures and obtaining.

The present invention solves the problems of the technologies described above, and the technical scheme that adopts is: a kind of Atomatic focusing method is provided, may further comprise the steps: A) catch the view data of being obtained by camera; B) described view data is carried out eye detection; C) do you judge in the described view data and detect eyes? if not, then jump to steps A); If so, then enter step D); D) according to the corresponding center position of the location positioning of eyes; E) do you judge that described center position needs again to focus? if not, then finish; If so, then enter step F); F) automatically focus according to described center position and save as new focusing center point coordinate, finish.

As a kind of preferred version, described step D) further comprise: D1) when only detecting eyes, then the central point with these eyes is defined as described center position; D2) when detecting two eyes, then the mid point with two eye center point lines is defined as described center position.

As a kind of preferred version, described step e) further comprise: E1) the focusing center point coordinate of the original preservation of supposition is X (xOld, yOld), the new center point coordinate Y (xNew, yNew) of described eyes; E2) is the distance between Y coordinate points and the X coordinate points greater than predetermined value N? if so, then enter step F), otherwise directly finish.

As a kind of preferred version, the span of described predetermined value N is 1 to 50 distance between the pixel.

As a kind of preferred version, between described Y coordinate points and the X coordinate points apart from account form be:

$N=\sqrt{(\mathrm{xNew}-\mathrm{xOld})*(\mathrm{xNew}-\mathrm{xOld})+(\mathrm{yNew}-\mathrm{yOld})*(\mathrm{yNew}-\mathrm{yOld})}.$

Invention solves the technical problem that exists in the prior art, and a kind of autofocus system also is provided, and comprising: image acquisition unit, and it is used for catching the view data of being obtained by camera; Image detecting element, it is used for described view data is carried out eye detection; The eye judgement unit, it is used for judging whether described view data detects eyes, and according to the corresponding center position of the location positioning of eyes; Automatic focusing unit, it is used for according to the center position of described eyes image being focused automatically.

As a kind of preferred version, when described image detecting element only detected eyes, described judgement unit then was defined as described center position with the central point of these eyes; When image detecting element detected two eyes, described eye judgement unit then was defined as described center position with the mid point of two eye center point lines.

As a kind of preferred version, when the focusing center point coordinate of original preservation is X (xOld, yOld) with the new center point coordinate Y (xNew of described eyes, yNew) distance between is during greater than predetermined value N, automatically focuses according to described center position and save as new focusing center point coordinate in described automatic focusing unit.

As a kind of preferred version, the span of described predetermined value N is 1 to 50 distance between the pixel.

As a kind of preferred version, between described Y coordinate and the X coordinate apart from account form be:

$N=\sqrt{(\mathrm{xNew}-\mathrm{xOld})*(\mathrm{xNew}-\mathrm{xOld})+(\mathrm{yNew}-\mathrm{yOld})*(\mathrm{yNew}-\mathrm{yOld})}.$

There are following advantage in Atomatic focusing method of the present invention and focusing system with respect to prior art: Atomatic focusing method of the present invention, directly the eyes in the view data are detected, and avoid because obtaining of high-frequency signal caused focusing unsuccessfully.Simultaneously, when the ocular data of crawl view data, embody real-time, take pictures consistent with the effect of preview.

Description of drawings

Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of a part of the present invention, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:

Fig. 1 is Atomatic focusing method flow chart of the present invention;

Fig. 2 is the system block diagram of autofocus system of the present invention.

Embodiment

In order to make technical problem to be solved by this invention, technical scheme and beneficial effect clearer, clear, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.

As shown in Figure 1, Atomatic focusing method of the present invention may further comprise the steps:

Steps A): catch the view data of being obtained by camera.

At present, most computing equipment (such as PC, portable terminal) all is furnished with camera.This step then is to obtain the view data of being obtained by camera, data format may be a kind of in the following data format: 16BE555 (the BE form of RGB555), 16LE555 (the LE form of RGB555), 16LE5551 (the LE form of RGB5551), 16BE565 (the BE form of RGB565), 16LE565 (the LE form of RGB565), the 24RGB(RGB order), the 24BGR(BGR order), the 32ARGB(ARGB order), the 32BGRA(BGRA order), the 32ABGR(ABGR order), the 32RGBA(RGBA order), the 64ARGB(ARGB order, each passage accounts for 16), the 48RGB(RGB order, each passage accounts for 16), the 32AlphaGray(AGray order, each passage accounts for 16), 16Gray(only has Gray, each passage accounts for 16), the 30RGB(RGB order, each passage accounts for 10), 422YpCbCr8,4444YpCbCrA8,4444YpCbCrA8R, 4444AYpCbCr8,4444AYpCbCr16,444YpCbCr8,422YpCbCr16,22YpCbCr10,444YpCbCr10,420YpCbCr8Planar, 420YpCbCr8PlanarFullRange, 422YpCbCr_4A_8BiPlanar, 420YpCbCr8BiPlanarVideoRange, YCbCrBiPlanar, the forms such as 422YpCbCr8_yuvs.

Step B): described view data is carried out eye detection.

Be prior art to eye detection in view data, such as the row eye detection mainly is to use known technology.For example: openly corresponding technology is arranged among the An Algorithm for real time eye detection in face images (T.D ' Orazio, M.Leo, G.Cicirelli, A.Distante).

Step C): judge in the described view data to detect eyes? if not, then jump to steps A); If so, then enter step D).

If in view data, do not detect eyes, then jump to steps A) again obtain the view data obtained by camera, camera can grasp the view data of same position or diverse location again; If detect eyes in the view data, then enter step D).

Step D): according to the corresponding center position of the location positioning of eyes.

Specifically, when only detecting eyes, then the central point with these eyes is defined as described center position; When detecting two eyes, then the mid point with two eye center point lines is defined as described center position.

Step e): judge that described center position needs again to focus? if not, then finish; If so, then enter step F).

This step need to judge whether needs are focused again according to described center position, if this center position does not need again to focus, and process ends then; If need again automatically focusing, then enter step F) automatic focusing flow process.Specifically, can may further comprise the steps:

E1) the focusing center point coordinate of the original preservation of supposition is X (xOld, yOld), the new center point coordinate Y (xNew, yNew) of described eyes;

E2) is the distance between Y coordinate points and the X coordinate points greater than predetermined value N? if so, then enter step F), otherwise directly finish.

Above-mentioned N value span is 1 to 50 distance between the pixel, preferred 10 pixels.Between Y coordinate points and the X coordinate points apart from account form be:

$N=\sqrt{(\mathrm{xNew}-\mathrm{xOld})*(\mathrm{xNew}-\mathrm{xOld})+(\mathrm{yNew}-\mathrm{yOld})*(\mathrm{yNew}-\mathrm{yOld})}.$

Step F): automatically focus and save as new focusing center point coordinate according to described center position, finish.

Adopt the method for automatic focusing of the present invention, directly people's eyes detected, avoid in the prior art causing focusing unsuccessfully because of the erroneous judgement to high-frequency signal.The method of simultaneously automatic focusing of the present invention embodies the real-time characteristics, takes pictures consistent with the effect of preview.

As shown in Figure 2, the present invention also provides a kind of autofocus system.This focusing system comprises, image acquisition unit, image detecting element, eye judgement unit, the automatic unit of focusing.Image acquisition unit is used for catching the view data of being obtained by camera; Image detecting element is used for described view data is carried out eye detection; The eye judgement unit is used for judging whether described view data detects eyes, and according to the corresponding center position of the location positioning of eyes; Automatically the focusing unit is used for according to the center position of described eyes image being focused automatically.

For image detecting element and eye judgement unit, when described image detecting element only detected eyes, the eye judgement unit then was defined as described center position with the central point of these eyes; When image detecting element detected two eyes, described eye judgement unit then was defined as described center position with the mid point of two eye center point lines.

For automatic focusing unit, when the focusing center point coordinate of original preservation is X (xOld, yOld) with the new center point coordinate Y (xNew of described eyes, yNew) distance between is during greater than predetermined value N, automatically focuses according to described center position and save as new focusing center point coordinate in the unit of automatically focusing.The span of predetermined value N is 1 to 50 distance between the pixel.Between Y coordinate and the X coordinate apart from account form be:

$N=\sqrt{(\mathrm{xNew}-\mathrm{xOld})*(\mathrm{xNew}-\mathrm{xOld})+(\mathrm{yNew}-\mathrm{yOld})*(\mathrm{yNew}-\mathrm{yOld})}.$

Above-mentioned explanation illustrates and has described the preferred embodiments of the present invention, as previously mentioned, be to be understood that the present invention is not limited to the disclosed form of this paper, should not regard the eliminating to other embodiment as, and can be used for various other combinations, modification and environment, and can in invention contemplated scope described herein, change by technology or the knowledge of above-mentioned instruction or association area.And the change that those skilled in the art carry out and variation do not break away from the spirit and scope of the present invention, then all should be in the protection range of claims of the present invention.

Claims (10)

1. an Atomatic focusing method is characterized in that, may further comprise the steps:

A) catch the view data of being obtained by camera;

B) described view data is carried out eye detection;

C) do you judge in the described view data and detect eyes? if not, then jump to steps A); If so, then enter step D);

D) according to the corresponding center position of the location positioning of eyes;

E) do you judge that described center position needs again to focus? if not, then finish; If so, then enter step F);

F) automatically focus according to described center position and save as new focusing center point coordinate, finish.

2. Atomatic focusing method according to claim 1 is characterized in that, described step D) further comprise:

D1) when only detecting eyes, then the central point with these eyes is defined as described center position;

D2) when detecting two eyes, then the mid point with two eye center point lines is defined as described center position.

3. Atomatic focusing method according to claim 1 is characterized in that, described step e) further comprise:

E1) the focusing center point coordinate of the original preservation of supposition is X (xOld, yOld), the new center point coordinate Y (xNew, yNew) of described eyes;

E2) is the distance between Y coordinate points and the X coordinate points greater than predetermined value N? if so, then enter step F), otherwise directly finish.

4. Atomatic focusing method according to claim 3 is characterized in that, the span of described predetermined value N is 1 to 50 distance between the pixel.

5. according to wanting profit to require 3 described Atomatic focusing methods, it is characterized in that, between described Y coordinate points and the X coordinate points apart from account form be:

$N=\sqrt{(\mathrm{xNew}-\mathrm{xOld})*(\mathrm{xNew}-\mathrm{xOld})+(\mathrm{yNew}-\mathrm{yOld})*(\mathrm{yNew}-\mathrm{yOld})}.$

6. an autofocus system is characterized in that, comprising:

Image acquisition unit, it is used for catching the view data of being obtained by camera;

Image detecting element, it is used for described view data is carried out eye detection;

The eye judgement unit, it is used for judging whether described view data detects eyes, and according to the corresponding center position of the location positioning of eyes;

Automatic focusing unit, it is used for according to the center position of described eyes image being focused automatically.

7. autofocus system according to claim 6 is characterized in that, when described image detecting element only detected eyes, described eye judgement unit then was defined as described center position with the central point of these eyes; When image detecting element detected two eyes, described eye judgement unit then was defined as described center position with the mid point of two eye center point lines.

8. autofocus system according to claim 6, it is characterized in that, when the focusing center point coordinate of original preservation is X (xOld, yOld) with the new center point coordinate Y (xNew of described eyes, yNew) distance between is during greater than predetermined value N, automatically focuses according to described center position and save as new focusing center point coordinate in described automatic focusing unit.

9. autofocus system according to claim 8 is characterized in that, the span of described predetermined value N is 1 to 50 distance between the pixel.

10. autofocus system according to claim 8 is characterized in that, between described Y coordinate and the X coordinate apart from account form is:

$N=\sqrt{(\mathrm{xNew}-\mathrm{xOld})*(\mathrm{xNew}-\mathrm{xOld})+(\mathrm{yNew}-\mathrm{yOld})*(\mathrm{yNew}-\mathrm{yOld})}.$

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