CN102314043A - Auxiliary focusing method for human face block - Google Patents
Auxiliary focusing method for human face block Download PDFInfo
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- CN102314043A CN102314043A CN2010102258753A CN201010225875A CN102314043A CN 102314043 A CN102314043 A CN 102314043A CN 2010102258753 A CN2010102258753 A CN 2010102258753A CN 201010225875 A CN201010225875 A CN 201010225875A CN 102314043 A CN102314043 A CN 102314043A
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Abstract
The invention discloses an auxiliary focusing method for a human face block which is suitable for an image acquisition device with an automatic focusing program having a preset sampling interval. The auxiliary focusing method for the human face block comprises the following steps of: acquiring an image to be focused, wherein the image to be focused is provided with the human face block; calculating a human face parameter of the human face block in the image to be focused; referring to a parameter focal distance comparison table according to the human face parameter to acquire a focusing segment; and performing the automatic focusing program according to the focusing segment and a human face sampling interval to acquire a target focal distance, wherein the human face sampling interval is less than the preset sampling interval.
Description
Technical field
The present invention relates to a kind of method of auxiliary focusing, particularly a kind of method with people's face block auxiliary focusing.
Background technology
When filmed image, need correctly focal length to subject obtaining clear photograph, and all have automatic focus function at general now image capture units such as digital camera.Automatically focusing can be divided into two big types haply, and one is active automatic focusing (active auto focus), another focus automatically for passive type (passive auto focus).
The pattern of one group of RF transmitter of the techniques make use of active automatic focusing or generating laser and relative receiver projection light is being taken the photograph on the body; Again with the distance between triangulation method computing cameras such as (triangulation) and the subject, and this distance is focal length.Yet active automatic focusing mode precision is relatively poor, that is to say to obtain focal length very accurately, and can't be used in the situation that things such as glass is arranged between image capture unit and the subject intercept.In addition, use active automatic focusing extra in camera optical transmitting set and receiver to be set, so cost is higher.
Automatically focusing is then before formal the shooting for passive type, and from from the nearest microspur of image capture unit many images of acquisition to the zone that is set as infinity, and the sharpness of the image that obtained of analysis decides focal length.The passive type mode of focusing automatically only need be used CIS and the arithmetic element that camera itself is had, and therefore can alleviate manufacturing cost.But passive type automatically focusing because the operand that need expend is bigger, therefore normal sacrifice precision with time of avoiding overspending in focusing automatically.
And in recent years, image capture units such as use digital camera come the user of filmed image significantly to increase.Except the photography professional, also there is increasing general user to use digital camera to take.Usually, the general captured image of user, because of shooting skill not as the professional, Gu Qisuo take the photograph image often have the not reciprocity problem of focal length.Yet when taking pictures, personage's image often is the part of the emphasis in the picture.Traditional automatic focusing mode but may be judged as photography body to other things beyond background or the personage, lose burnt problem on the contrary for the personage who takes emphasis and have.Moreover in case automatically the precision of focusing is not enough and produce the focusing error, the image that causes possibly taking is seriously fuzzy.Especially when the image of taking is portrait, appears at people's photography defective on the face and more seem bad.
Summary of the invention
In order to address the above problem, the present invention provides a kind of method of people's face block auxiliary focusing, and it is applicable to the image capture unit with an automatic focusing program.Automatically the focusing program has a preset sampling spacing, and the method for people's face block auxiliary focusing comprises: capture desire focusing image, wherein desire focusing image has people's face block; Calculate people's face parameter of the people's face block in the desire focusing image; Consult a parameter focal length table of comparisons to obtain a focusing section according to people's face parameter; And carry out automatic focusing program to obtain a target focal length according to focusing section and people's face sampling spacing, wherein people's face sampling spacing is less than preset sampling spacing.
People's face parameter can be that a length of people's face block and desire focusing image compares or area ratio.And the parameter focal length table of comparisons can be corresponding to a human face detection program, and image capture unit detects people's face block with this human face detection program in desire focusing image.
Implement example according to of the present invention one, consult the parameter focal length table of comparisons according to people's face parameter and can comprise: consult the parameter focal length table of comparisons according to people's face parameter, and obtain corresponding with people's face parameter one and predict focusing position with the step of the section that obtains focusing; And, be that reference point obtains the section of focusing with the prediction focusing position according to a convergent-divergent multiplying power of image capture unit.
In addition, the focusing section can have be a front section and one the back section.Wherein front section is between a nearly focal length of prediction focusing position to image capture unit, and back section is then between a focal length far away of prediction focusing position to image capture unit.And according to an enforcement example of the present invention, the length of front section can be identical with the length of back section.And implement example according to of the present invention another, the length of front section can greater than or less than the length of back section.
And after the section that obtains focusing, the program of focusing can be calculated the target focal length with a quadratic polynomial approximatioss automatically.
In sum, the method for people's face block auxiliary focusing is consulted the parameter focal length table of comparisons according to people's face parameter of people's face block, and in the focusing section that obtains, carries out automatic focusing program with higher precision.Therefore can improve the precision of automatic focusing and obtain better target focal length, and can photograph people's face image clearly.
Description of drawings
Fig. 1 is the block schematic diagram of image capture unit according to an embodiment of the invention;
Fig. 2 is the process flow diagram of the method for people's face block auxiliary focusing according to an embodiment of the invention;
Fig. 3 A is the synoptic diagram of people's face block according to an embodiment of the invention;
Fig. 3 B is the synoptic diagram of people's face block according to another embodiment of the present invention;
Fig. 4 A is the synoptic diagram of the section of focusing according to an embodiment of the invention;
Fig. 4 B is the synoptic diagram of the section of focusing according to another embodiment of the present invention;
Fig. 4 C is the synoptic diagram according to the focusing section of further embodiment of this invention; And
Fig. 5 is the synoptic diagram of articulation curve according to an embodiment of the invention.
Wherein, Reference numeral
20 image capture units
22 lens units
24 photosensitive units
26 microprocessors
28 storage elements
30 desires focusing image
32 people's face blocks
40 prediction focusing positions
42 focusing sections
44 front section
46 back sections
50 articulation curves
52 quadratic polynomial matched curves
Embodiment
Below in embodiment, be described in detail detailed features of the present invention and advantage; Its content is enough to make any those skilled in the art to understand technology contents of the present invention and implements according to this; And according to the disclosed content of this instructions, claim and accompanying drawing, any those skilled in the art can understand purpose and the advantage that the present invention is correlated with easily.
The present invention provides a kind of method of people's face block auxiliary focusing, and it is applicable to have a focusing automatically (wherein focusing program automatically has a preset sampling spacing for Auto Focusing, an AF) image capture unit of program.
Please with reference to Fig. 1, it is the block schematic diagram of the image capture unit of one enforcement example according to the present invention.But the image capture unit that method was suitable for according to people's face block auxiliary focusing of the present invention is not limited to Fig. 1.
Image capture unit 20 can for example be digital camera, camera, video camera or the network camera (webcam) of having camera function.Image capture unit 20 comprises a lens unit (lens unit) 22, one photosensitive unit (photosensitive unit) 24, one microprocessor (micro processor unit) 26 and one storage element (storage unit) 28.When pick-up image, image capture unit 20 with lens unit 22 focus in a pair of defocus distance (focusing distance also is called focal length, focus) on.Then when user's filmed image, microprocessor 26 controls lens unit 22 are to the focusing position that corresponding this focusing is left, and will be stored in storage element 28 through the image that lens unit 22 and photosensitive unit 24 obtain.
Focusing is from optic center point to object that refers to lens unit 22 or the distance between the photographed person, long measure can be rice or centimetre.And focusing position also can be called as focal length (focus length), and it refers to the distance between optic center point to the photosensitive unit 24 of lens unit 22.Image capture unit 20 can pass through a step motor (step motor does not illustrate) controls lens device 22 to different focusing positions.Focusing position is a unit with step pitch (step also is called step distance) generally.
Be noted that, focusing from focusing position between relation might not be to be directly proportional.Might not be that focusing is from the twice that is the step pitch number of half meter correspondence from the step pitch number that is 1 meter correspondence for example in focusing; Focusing also is not necessarily focusing from the twice that is the step pitch number of 1 meter correspondence from the step pitch number that is 2 meters correspondences.
Then please be simultaneously with reference to figure 2, Fig. 3 A and Fig. 3 B, its be respectively according to the present invention one implement people's face block auxiliary focusing of example the process flow diagram of method, and according to the present invention the different synoptic diagram of implementing people's face block of examples.
Image capture unit 20 at first captures desire focusing image 30 (step S110), and wherein desire focusing image 30 has people's face block (face block) 32.People's face block 32 refers to that photographed person's face is captured into after the desire focusing image 30, the image of people face part among the desire focusing image 30.And the microprocessor 26 of image capture unit 20 can be carried out a human face detection program, with the people's face block 32 in the detecting desire focusing image 30.
Image capture unit 20 can use automatic focusing program when flat, according to preset sample interval lens unit 22 is moved to different focusing positions one by one to focus automatically.Yet when detecting people's face block 32 in the desire focusing image 30, represent user's desire that at least one personage is taken.Then the method for people's face block auxiliary focusing can improve the precision of automatic focusing program and obtain a target focal length to the photographed person with following step, obtains outstanding portrait image than using the target focal length to take the photographed person.
Obtain after people's face block 32, microprocessor 26 calculates people's face parameter (step S 120) of the face block 32 in the desire focusing image 30.According to the present invention, people's face parameter can be that a length of people's face block 32 and whole desire focusing image 30 compares or area ratio.For example, suppose that the resolution of desire focusing image 30 is 640 * 480, and the resolution of the people's face block 32 that obtains with the human face detection process monitoring is 120 * 80.The face parameter can be
or
Because people's face parameter adopts people's face block 32 and desire focus ratio value but not absolute value between the image 30, so the method for people's face block auxiliary focusing is applicable to different images form and various image capture unit 20.
Then microprocessor 26 is consulted a parameter focal length table of comparisons according to people's face parameter, to obtain a focusing section (step S130).So the scope of focusing section possible focusing position during for acquisition photographed person's image is should be with higher focusing precision automatic focusing program of execution in the focusing section.
Preferably, the parameter focal length table of comparisons can be corresponding to the human face detection program.Even, use different human face detection programs possibly find out people's face block 32 of different sizes or diverse location because handle same desire focusing image 30.Therefore the parameter focal length table of comparisons can cooperate the human face detection program design.
Shown in Fig. 3 A and Fig. 3 B, generally speaking, 20 nearer photographed persons can form bigger people's face block 32 in desire is focused image 30 apart from image capture unit; 20 photographed persons far away then can form less people's face block 32 in desire is focused image 30 apart from image capture unit.
According to one embodiment of the invention, consult the parameter focal length table of comparisons according to people's face parameter and can comprise: consult the parameter focal length table of comparisons according to people's face parameter, and obtain a prediction focusing position corresponding with people's face parameter with the step of the section that obtains focusing; And, be that reference point obtains the section of focusing with the prediction focusing position according to a convergent-divergent multiplying power of image capture unit 20.
When the convergent-divergent multiplying power was focused image 30 for the acquisition desire, the zoom that image capture unit 20 is set up (zoom) multiplying power was also corresponding to focal length.For example when the lens unit 22 of image capture unit 20 can carry out focal length be 37mm (millimeter) to the 260mm zoom, then the convergent-divergent multiplying power is 37mm to 260mm.The lens unit 22 of tool zoom function can be adjusted the position of the eyeglass among the lens unit 22 before shooting, and changes focal length.Wherein an end of shortest focal length (37mm) is called wide-angle side (wide), and image capture unit 20 can capture the bigger image of scope; Otherwise an end (260mm) of longest focal length then is a telescope end (tele), visually similarly is at a distance the scenery image image capture unit 20 that furthers, and the effect that the handlebar image amplifies.
The convergent-divergent multiplying power can have influence on preset sampling spacing.For example when the convergent-divergent multiplying power was set as near wide-angle side, preset sampling spacing can be 20step; And when the convergent-divergent multiplying power was set as near telescope end, preset sampling spacing can be 30step.Convergent-divergent multiplying power when image capture unit 20 can be according to acquisition desire focusing image 30 is that reference point obtains the section of focusing with the prediction focusing position, the scope of most probable focusing position when just obtaining capturing photographed person's image.
Please with reference to Fig. 4 A, Fig. 4 B and Fig. 4 C, it is respectively the different synoptic diagram of implementing the focusing section of example according to the present invention.
In step S130 with prediction focusing position 40 section 42 that obtains focusing, and focusing section 42 can to have be a front section 44 and a back section 46.Wherein front section 44 is positioned between the nearly focal length (Near) of prediction focusing position 40 to image capture unit 20, and 46 of back sections are positioned between the focal length far away (Far) of prediction focusing position 40 to image capture unit 20.Wherein the focal length of nearly focal length is grown (for example 200 step pitches), and the focal length of focal length far away is lacked (for example 100 step pitches).And different convergent-divergent multiplying powers also can be to having different nearly focal lengths and focal length far away.
And according to the present invention, the length of front section 44 can be identical with the length of back section 46; Or the length of front section 44 can be greater than or less than the length of back section 46.
Below lift actual data and explain as an example, but be not limited to the data that these are given an example according to the method for people's face block auxiliary focusing of the present invention.
When capturing desire focusing image 30, the convergent-divergent multiplying power of image capture unit 20 is near wide-angle side, and then representative possibly desire focused to the photographed person than the distant place.The preset sampling spacing of supposing this moment is 20 step pitches, and the prediction focusing position 40 that obtains of tabling look-up is the 150th step pitch.Then can specify by 10 step pitches of prediction focusing position 40 toward the focal length direction far away of present convergent-divergent multiplying power and rise, the scope till to prediction focusing position 40 toward 20 step pitches of nearly focal length direction is the section 42 of focusing.Therefore the section 42 of focusing is the scope between the 140th step pitch to the 170 step pitches.
For example the convergent-divergent multiplying power is near telescope end during at acquisition desire focusing image 30 when image capture unit 20 again, and preset sampling spacing is 30 step pitches.Then can specify by the 150th step pitch place of prediction focusing position 40 and rise toward 30 step pitches of the focal length direction far away of present convergent-divergent multiplying power, the scope till to prediction focusing position 40 toward 15 step pitches of nearly focal length direction is the section 42 of focusing.Therefore the section 42 of focusing is the scope between the 120th step pitch to the 165 step pitches.
Yet implementing example according to of the present invention another, is not the record prediction focusing position 40 corresponding with people's face parameter in the parameter focal length table of comparisons, and a record prediction burnt section corresponding with people's face parameter.And image capture unit 20 also can be like above-mentioned step according to convergent-divergent multiplying power and burnt section section 42 that obtains focusing of prediction.
Obtain focusing after the section 42, microprocessor 26 is carried out automatic focusing program to obtain target focal length (step S140) according to focusing section 42 and people's face sampling spacing.Wherein people's face sampling spacing is less than preset sampling spacing, and promptly microprocessor 26 is carried out automatic focusing program with the automatic focusing precision that is higher than preset value in focusing section 42.People's face sampling focal length is also relevant with the convergent-divergent multiplying power, and for example when convergent-divergent multiplying power during near wide-angle side, people's face spacing of taking a sample can be 4 step pitches; And when convergent-divergent multiplying power during near telescope end, people's face sampling spacing can be 6 step pitches.
Hold the example of above-mentioned real data, then can in the focusing section 42 between the 140th step pitch to the 170 step pitches, carry out automatic focusing program with the sample interval of 4 step pitches.Or can in the focusing section 42 between the 120th step pitch to the 165 step pitches, carry out automatic focusing program with the sample interval of 6 step pitches.
Obtain focusing after the section 42, the program of focusing automatically just can be calculated the target focal length with a quadratic polynomial approximatioss.
Please with reference to Fig. 5, it is the synoptic diagram of the articulation curve of one enforcement example according to the present invention.
The quadratic polynomial approximatioss also can be described as the quadratic polynomial curve fitting method.Automatically the focusing program captures an image respectively on a plurality of focusing positions within the focusing section 42, and calculates a sharpness of these images.Then can each focusing in the focusing section 42 and corresponding sharpness be carried out described point as X axle and Y axle, and obtain an articulation curve 50.Then carrying out the quadratic polynomial curve fitting according to articulation curve 50 can obtain a quadratic polynomial matched curve 52, and the pairing focusing position of peak value (peak) of calculating quadratic polynomial matched curve 52 is as the target focal length.
In more detail, the program of focusing is automatically whenever calculated sharpness at a distance from image of people's face sampling spacing acquisition within focusing section 42.And the account form of people's face sampling spacing can be divided by a number of sampling with focusing section 42.Then within same focusing section 42, number of sampling is more just representes that people's face sampling spacing is more little, and the precision of focusing is high more automatically.
For example, when in desire focusing image 30, not detecting people's face block 32, the program of focusing is automatically got 10 number of sampling at microspur to the scope between the infinity and is focused automatically.And when in desire focusing image 30, detecting people's face block 32, also in focusing section 42, get 10 number of sampling and focus automatically.Thus, though the time of spending same is carried out the quadratic polynomial approximatioss with 10 images, can obtain target focal length more accurately, and can avoid the error of focusing.
The aforesaid parameter focal length table of comparisons is to adopt experimental method to set up.Experimental method is set up and to be referred to take with the photographed person of different focal length to the various people's face of correspondence parameter, calculate and the prediction focusing position 40 of corresponding each one face parameter, so as to setting up the parameter focal length table of comparisons.
In addition, though aforesaid enforcement example is an example with the desire focusing image 30 with single individual face block 32, the method for people's face block auxiliary focusing also is applicable to the desire focusing image 30 with a plurality of people's face blocks 32.The mean value of the for example desirable somebody of institute face parameter, median (median) or mode (mode) are tabled look-up; Or available a plurality of people's face parameter is tabled look-up and is obtained a plurality of prediction focusing positions 40 and get its average, median or mode again as last prediction focusing position 40.
In sum, consult the parameter focal length table of comparisons according to the method for people's face block auxiliary focusing of the present invention according to people's face parameter of people's face block, and in the focusing section that obtains, carry out automatic focusing program with higher precision.Owing to do not need additional hardware such as optical transmitting set and receiver are set in image capture unit, so manufacturing cost is lower.Moreover the precision that improves focusing automatically just can obtain than known technology target focal length more accurately, and can make the user photograph people's face image clearly.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (9)
1. the method for people's face block auxiliary focusing is applicable to the image capture unit with an automatic focusing program, it is characterized in that, this focusing program automatically has a preset sampling spacing, and the method for this people's face block auxiliary focusing comprises:
Capture desire focusing image, wherein this desire focusing image has people's face block;
Calculate people's face parameter of this people's face block in this desire focusing image;
Consult a parameter focal length table of comparisons to obtain a focusing section according to this people's face parameter; And
Carry out this automatic focusing program to obtain a target focal length according to this focusing section and people's face sampling spacing, wherein this people's face sampling spacing is less than this preset sampling spacing.
2. the method for people's face block auxiliary focusing according to claim 1 is characterized in that, this people's face parameter is the length ratio of this people's face block and this desire focusing image.
3. the method for people's face block auxiliary focusing according to claim 1 is characterized in that, this people's face parameter is the area ratio of this people's face block and this desire focusing image.
4. the method for people's face block auxiliary focusing according to claim 1 is characterized in that, this parameter focal length table of comparisons is corresponding to a human face detection program, and this image capture unit is with this human face detection program this people's face block of detecting in this desire focusing image.
5. the method for people's face block auxiliary focusing according to claim 1 is characterized in that, this is consulted a parameter focal length table of comparisons according to this people's face parameter and comprises with the step that obtains a focusing section:
Consult this parameter focal length table of comparisons according to this people's face parameter, and obtain a prediction focusing position corresponding with this people's face parameter; And
According to a convergent-divergent multiplying power of this image capture unit, be that reference point obtains this focusing section with this prediction focusing position.
6. the method for people's face block auxiliary focusing according to claim 5; It is characterized in that; This focusing section has a front section and a back section; This front section is between a nearly focal length of this prediction focusing position to this image capture unit, and this back zone section is positioned between the focal length far away of this prediction focusing position to this image capture unit, and the length of this front section is identical with the length of this back section.
7. the method for people's face block auxiliary focusing according to claim 5; It is characterized in that; This focusing section has a front section and a back section; This front section is between a nearly focal length of this prediction focusing position to this image capture unit, and this back zone section is positioned between the focal length far away of this prediction focusing position to this image capture unit, and the length of this front section is greater than the length of this back section.
8. the method for people's face block auxiliary focusing according to claim 5; It is characterized in that; This focusing section has a front section and a back section; This front section is between a nearly focal length of this prediction focusing position to this image capture unit, and this back zone section is positioned between the focal length far away of this prediction focusing position to this image capture unit, and the length of this front section is less than the length of this back section.
9. the method for people's face block auxiliary focusing according to claim 5 is characterized in that, this program of focusing is automatically calculated this target focal length with a quadratic polynomial approximatioss.
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| CN110336948A (en) * | 2019-07-23 | 2019-10-15 | 浙江华创视讯科技有限公司 | A kind of method, apparatus, storage medium and electronic device that presumptive area focuses |
| CN110445985A (en) * | 2019-08-30 | 2019-11-12 | 联想(北京)有限公司 | A kind of image-pickup method, electronic equipment and computer readable storage medium |
| TWI695632B (en) * | 2018-02-22 | 2020-06-01 | 圓展科技股份有限公司 | Audio control device and control method thereof |
| CN112367468A (en) * | 2020-10-30 | 2021-02-12 | 维沃移动通信有限公司 | Image processing method and device and electronic equipment |
| CN115278089A (en) * | 2022-09-26 | 2022-11-01 | 合肥岭雁科技有限公司 | Face fuzzy image focusing correction method, device, equipment and storage medium |
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Application publication date: 20120111 |