CN104361329B - A kind of photo method of cutting out and system based on recognition of face - Google Patents
A kind of photo method of cutting out and system based on recognition of face Download PDFInfo
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- CN104361329B CN104361329B CN201410681308.7A CN201410681308A CN104361329B CN 104361329 B CN104361329 B CN 104361329B CN 201410681308 A CN201410681308 A CN 201410681308A CN 104361329 B CN104361329 B CN 104361329B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/16—Human faces, e.g. facial parts, sketches or expressions
- G06V40/161—Detection; Localisation; Normalisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/61—Control of cameras or camera modules based on recognised objects
- H04N23/611—Control of cameras or camera modules based on recognised objects where the recognised objects include parts of the human body
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Abstract
The invention discloses a kind of photo method of cutting out and system based on recognition of face, it is related to the shooting technology of mobile terminal, it is intended to be difficult to shoot the defect of standard photographs for existing mobile device, a kind of acquisition methods of the photo of fixed aspect ratio example simple to operation is provided.Technical key point includes：Step 1：Face datection is carried out to the image of shooting and obtains Face datection frame；Step 2：Using Face datection frame central point as origin, according to the area ratio 10 of area and Face datection frame：7 generation length-width ratios are 4：3 clipping rectangle frame；Step 3：Part other than clipping rectangle frame described in image is cropped.
Description
Technical field
The present invention relates to the shooting technology of mobile terminal, especially a kind of photo of fixed aspect ratio example simple to operation
Acquisition methods.
Background technology
As the camera function of the development of mobile terminal, either mobile phone or tablet computer is all stronger and stronger, lead to
Crossing mobile device and taking pictures becomes an indispensable part in people's life.User is in daily life for software of taking pictures
Frequent using also tending to, application scenarios are also more extensive.
But the portrait photo used in specific occasion is needed to have strict requirements (example to ratio of the face in photo
Such as：Certificate photo etc.).User needs to be fabricated to there is still a need for shooting to photo studio when the standard photographs of certificate photo etc at present
This is very high.
In fact, the camera function of mobile phone or tablet computer has been able to meet wanting for this kind of standard photographs of shooting at present
It asks, but due to the irregular difference of level of user's technique for taking and cutting photo, causes most users not use simply and move
Dynamic terminal taking cuts out the portrait photo for meeting demand percentage.
Also occur some application programs that can be used for cutting photo currently on the market, principle is such：User
After having taken photograph, carries out manual editing by the auxiliary line that application program provides and cut out figure, finally cut out the size specification that suits the requirements
Photo.Application program can provide a mark ratio auxiliary line for needing photo under normal conditions, and user must be the people of photo
As being inserted in auxiliary line, then cuts and be likely to reach standard.
However, such design can bring following problem：1, cut result leans on user to be manually operated completely, and pole has can
Result can be cut and do not meet size.2, trimming operation is complicated, and the study threshold that user uses is high, and use cost is big.So these
Traditional cutting method for mobile terminal operating interactive there is no relatively good optimization and help, the above problem needs a kind of new
Aptitude manner go to optimize and solve these problems.
Invention content
The technical problem to be solved by the present invention is to：In view of the above problems, it provides a kind of based on recognition of face
Photo method of cutting out.
The first photo method of cutting out based on recognition of face provided by the invention, including：
Step 1：Face datection is carried out to the image of shooting and obtains Face datection frame；
Step 2：Using Face datection frame central point as origin, according to the area ratio 10 of area and Face datection frame：7 generate
Length-width ratio is 4：3 clipping rectangle frame；
Step 3：Part other than clipping rectangle frame described in image is cropped.
When the image Aspect Ratio that user needs is more than 4:Further include further when 3：
Step 4：It is more than 4 by length-width ratio of the central point of Face datection frame:The origin of 3 clipping rectangle frame, with the length
Wide ratio is 4:A length of length-width ratio of 3 clipping rectangle frame is more than 4:The length of 3 clipping rectangle frame, the image needed according to user are long
Wide ratio calculates length-width ratio and is more than 4:The wide length of 3 clipping rectangle frame is more than 4 to obtain length-width ratio:3 rectangle is cut out
Cut frame；
Step 5：Length-width ratio described in image is more than 4:Part other than 3 clipping rectangle frame crops.
When the image Aspect Ratio that user needs is less than 4:When 3, still further comprise：
Step 4：It is less than 4 by length-width ratio of the central point of Face datection frame:The origin of 3 clipping rectangle frame, with the length
Wide ratio is 4:The width of 3 clipping rectangle frame is that length-width ratio is less than 4:The width of 3 clipping rectangle frame, the image needed according to user are long
Wide ratio calculates length-width ratio and is less than 4:The length of the length of 3 clipping rectangle frame is less than 4 to obtain length-width ratio:3 rectangle is cut out
Cut frame；
Step 5：Length-width ratio described in image is less than 4:Part other than 3 clipping rectangle frame crops.
Preferably, when shooting image, face auxiliary wire frame, eyes auxiliary line and ears auxiliary line are shown in view-finder；
Wherein, face auxiliary wire frame is a rectangular wire frame or oval wire frame, the width or minor axis of face auxiliary wire frame with take
The width 0.6~0.7 wide in the same direction and for view-finder size of scape frame.The width or minor axis of wire frame are assisted according to face, calculate people
Face assists the height or major diameter of wire frame, in a preferred embodiment, face assist the width of wire frame and high ratio or minor axis with
The ratio of major diameter is 1：1~1.1:1.The central point of face auxiliary wire frame is located at the surface of view-finder central point, and in the two
The distance between heart point is the 8%~12% of view-finder dimensional height.Ears auxiliary line is to be located at face to assist wire frame two
Two straight lines of side, and it is face auxiliary line frame that the ears auxiliary line of arbitrary side assists the distance of wire frame central point apart from face
The 18%~22% of width.Eyes auxiliary line is the straight line perpendicular to ears auxiliary line, and eyes auxiliary line is auxiliary apart from face
Wide or upper vertex distance is the 40%~45% of face auxiliary line frame height degree or major diameter on index contour frame.
The second provided by the invention photo method of cutting out based on recognition of face, including：
Step 1：Face datection is carried out to the image of shooting and obtains Face datection frame；
Step 2：Using Face datection frame central point as origin, according to the area ratio 10 of area and Face datection frame：7 generate
Length-width ratio is 4：3 clipping rectangle frame；
Step 3：It is more than 4 by length-width ratio of the central point of Face datection frame:The origin of 3 clipping rectangle frame, with the length
Wide ratio is 4:A length of length-width ratio of 3 clipping rectangle frames is more than 4:The length of 3 clipping rectangle frame, the image length and width needed according to user
Ratio calculates length-width ratio and is more than 4:The wide length of 3 clipping rectangle frame is more than 4 to obtain length-width ratio:3 clipping rectangle
Frame；
Step 4：Length-width ratio described in image is more than 4:Part other than 3 clipping rectangle frame crops.
The third photo method of cutting out based on recognition of face provided by the invention, including：
Step 1：Face datection is carried out to the image of shooting and obtains Face datection frame；
Step 2：Using Face datection frame central point as origin, according to the area ratio 10 of area and Face datection frame：7 generate
Length-width ratio is 4：3 clipping rectangle frame；
Step 3：It is less than 4 by length-width ratio of the central point of Face datection frame:The origin of 3 clipping rectangle frame, with the length
Wide ratio is 4:The width of 3 clipping rectangle frame is that length-width ratio is less than 4:The width of 3 clipping rectangle frame, the image needed according to user are long
Wide ratio calculates length-width ratio and is less than 4:The length of the length of 3 clipping rectangle frame is less than 4 to obtain length-width ratio:3 rectangle is cut out
Cut frame；
Step 4：Length-width ratio described in image is less than 4:Part other than 3 clipping rectangle frame crops.
In conclusion by adopting the above-described technical solution, the beneficial effects of the invention are as follows：
1. can be on mobile terminals automatically by the photo of user's shooting according to standard photographs or use using the method for the present invention
The length-width ratio that family needs is cut, and is cut to image without user, was not only brought great convenience for user manually, but also
Improve the accuracy of cutting.
2. the present invention also provides the method for the laying auxiliary line in imaging view-finder, user, will when shooting portrait
Eyes are aligned in eyes auxiliary line, can help reference object that head is ajusted；Ears are aligned in ears auxiliary line, Ke Yibao
The head for demonstrate,proving reference object is not inclined；It allows face in face auxiliary line, can ensure reference object and mobile device camera lens in this way
Distance shoots the photo that the image come can facilitate follow-up proportional cutting as required to go out more standard in this way.
Description of the drawings
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein：
Fig. 1 is 4 to cut out length-width ratio according to the method for the present invention:The schematic diagram of 3 images.
Fig. 2 is the schematic diagram that other aspect ratio pictures are cut out according to the method for the present invention.
Fig. 3 is the design sketch that auxiliary line is arranged in view-finder according to the method for the present invention.
It is marked in figure：
1 is face detection block；2 be length-width ratio be 4:3 clipping rectangle frame；3 are more than 4 for length-width ratio:3 clipping rectangle
Frame；4 be length-width ratio be less than 4:3 clipping rectangle frame；5 be eyes auxiliary line；6 be ears auxiliary line；7 be face auxiliary line.
Specific implementation mode
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive
Feature and/or step other than, can combine in any way.
Any feature disclosed in this specification unless specifically stated can be equivalent or with similar purpose by other
Alternative features are replaced.That is, unless specifically stated, each feature is an example in a series of equivalent or similar characteristics
.
Embodiment one
Such as Fig. 1, the first photo method of cutting out based on recognition of face provided by the invention, including：
Step 1：Face datection is carried out to the image of shooting and obtains Face datection frame 1；In the present embodiment, is used and had by item
Third party's face datection application obtain the Face datection frame.
Step 2：Using 1 central point of Face datection frame as origin, according to the area ratio 10 of area and Face datection frame：7 lifes
It is 4 at length-width ratio：3 clipping rectangle frame 2, as shown in Figure 1.
Step 3：Part other than clipping rectangle frame described in image 2 is cropped.
Embodiment two
When the image Aspect Ratio that user needs is more than 4:When 3, cutting process is, such as Fig. 1 and Fig. 2：
Step 1：Face datection is carried out to the image of shooting and obtains Face datection frame 1；
Step 2：Using 1 central point of Face datection frame as origin, according to the area ratio 10 of area and Face datection frame：7 lifes
It is 4 at length-width ratio：3 clipping rectangle frame 2；
Step 3：It is more than 4 by length-width ratio of the central point of Face datection frame:The origin of 3 clipping rectangle frame, with the length
Wide ratio is 4:A length of length-width ratio of 3 clipping rectangle frames is more than 4:The length of 3 clipping rectangle frame, the image length and width needed according to user
Ratio calculates length-width ratio and is more than 4:The wide length of 3 clipping rectangle frame is more than 4 to obtain length-width ratio:3 clipping rectangle
Frame 3；
Step 4：Length-width ratio described in image is more than 4:Part other than 3 clipping rectangle frame 3 crops.
It is that cut obtained length-width ratio in embodiment one be 4 as the deformation of embodiment two:Secondary sanction is done on 3 image
It cuts：
It is more than 4 by length-width ratio of the central point of Face datection frame:The origin of 3 clipping rectangle frame is with the length-width ratio
4:A length of length-width ratio of 3 clipping rectangle frame is more than 4:The length of 3 clipping rectangle frame, the image Aspect Ratio needed according to user
It calculates length-width ratio and is more than 4:The wide length of 3 clipping rectangle frame is more than 4 to obtain length-width ratio:3 clipping rectangle frame；
Length-width ratio described in image is more than 4:Part other than 3 clipping rectangle frame crops.
Embodiment three：
When the image Aspect Ratio that user needs is less than 4:When 3, cutting process is, with continued reference to Fig. 1 and Fig. 2：
Step 1：Face datection is carried out to the image of shooting and obtains Face datection frame 1；
Step 2：Using Face datection frame central point as origin, according to the area ratio 10 of area and Face datection frame：7 generate
Length-width ratio is 4：3 clipping rectangle frame 2；
Step 3：It is less than 4 by length-width ratio of the central point of Face datection frame:The origin of 3 clipping rectangle frame, with the length
Wide ratio is 4:The width of 3 clipping rectangle frame is that length-width ratio is less than 4:The width of 3 clipping rectangle frame, the image needed according to user are long
Wide ratio calculates length-width ratio and is less than 4:The length of the length of 3 clipping rectangle frame is less than 4 to obtain length-width ratio:3 rectangle is cut out
Cut frame 4；
Step 4：Length-width ratio described in image is less than 4:Part other than 3 clipping rectangle frame 4 crops.
Similar to embodiment two, the present embodiment can also have following deformation, be to cut obtained length and width in embodiment one
Than being 4:Secondary cutting is done on 3 image：
It is less than 4 by length-width ratio of the central point of Face datection frame:The origin of 3 clipping rectangle frame is with the length-width ratio
4:The width of 3 clipping rectangle frame is that length-width ratio is less than 4:The width of 3 clipping rectangle frame, the image Aspect Ratio needed according to user
It calculates length-width ratio and is less than 4:The length of the length of 3 clipping rectangle frame is less than 4 to obtain length-width ratio:3 clipping rectangle frame；
Length-width ratio described in image is less than 4:Part other than 3 clipping rectangle frame crops.
In order to ensure to cut out the photo of more standard, the present invention also provides one kind when shooting image, such as Fig. 3,
Eyes auxiliary line 5, the mode of ears auxiliary line 6 and face auxiliary wire frame 7 are shown in view-finder.
The size for determining mobile terminal view-finder first specifically includes wide and high.It is a rectangular wire frame that face, which assists wire frame,
Or oval wire frame, wherein the width of the width of face auxiliary wire frame or minor axis and view-finder is in the same direction and is the width of view-finder size
0.6~0.7.The width or minor axis of wire frame are assisted according to face, calculate the height or major diameter of face auxiliary wire frame, preferably at one
In embodiment, it is 1 that face, which assists the ratio of width to height (or ratio of minor axis and major diameter) of wire frame,：1~1.1:1.Face assists wire frame
Central point is located at the surface of view-finder central point, and 8% that the distance between the two central point is view-finder dimensional height~
12%, the specific location of face auxiliary wire frame is thus determined.Ears auxiliary line is to be located at face to assist wire frame both sides
Two straight lines, and it is face auxiliary line frame width that the ears auxiliary line of arbitrary side assists the distance of wire frame central point apart from face
The 18%~22% of degree.Eyes auxiliary line is the straight line perpendicular to ears auxiliary line, and eyes auxiliary line is assisted apart from face
Wide or upper vertex distance is the 40%~45% of face auxiliary line frame height degree on wire frame.
In Fig. 3, outermost rectangular wire frame is the view-finder of mobile terminal, and user needs the double of reference object when taking pictures
Eye is aligned in eyes auxiliary line, helps reference object that head is ajusted；Reference object ears are aligned in ears auxiliary line by user
On, it is ensured that the head of reference object is not inclined；User allows the face of reference object to be aligned in face auxiliary wire frame, in this way can be with
Ensure reference object and mobile terminal distance of camera lens, shoots the photo come in this way and be more suitable for subsequently cutting.
Can be easily that user shoots standard photographs in conjunction with the embodiment of above-mentioned auxiliary line and each cutting, mobile phone,
Using after the method for the present invention on the mobile terminals such as tablet computer, user easily can shoot standard using these mobile devices and shine
Piece has saved time and the monetary cost of user.
The invention is not limited in specific implementation modes above-mentioned.The present invention, which expands to, any in the present specification to be disclosed
New feature or any new combination, and disclose any new method or process the step of or any new combination.
Claims (4)
1. a kind of photo method of cutting out based on recognition of face, which is characterized in that including：
Step 1：Face datection is carried out to the image of shooting and obtains Face datection frame；
Step 2：Using Face datection frame central point as origin, according to the area ratio 10 of area and Face datection frame：7 generate length and width
Than being 4：3 clipping rectangle frame；
Step 3：Part other than clipping rectangle frame described in image is cropped；
And when shooting image, face auxiliary wire frame, eyes auxiliary line and ears auxiliary line are shown in view-finder；
Wherein, face auxiliary wire frame is a rectangular wire frame, and the width of face auxiliary wire frame and the width of mobile device view-finder are in the same direction
And to find a view the 0.6~0.7 of width of frame, it is 1 that face, which assists the wide and high ratio of wire frame,：1~1.1:1, face assists wire frame
Central point be located at the surface of view-finder central point, and 8% that the distance between the two central point is view-finder height~
12%；
Ears auxiliary line is to be located at the straight line of face auxiliary wire frame both sides, and the ears auxiliary line of arbitrary side is apart from face
It is the 18%~22% of face auxiliary line width of frame to assist the distance of wire frame central point；Eyes auxiliary line is to be assisted perpendicular to ears
The straight line of line, eyes auxiliary line wide distance on face auxiliary wire frame be face auxiliary line frame height degree 40%~
45%；
Alternatively, face auxiliary wire frame is an oval wire frame, the minor axis of face auxiliary wire frame and the width of view-finder are in the same direction and to find a view
The 0.6~0.7 of width of frame, it is 1 that face, which assists the minor axis of wire frame and the ratio of major diameter,：1~1.1:1, face assists in wire frame
Heart point is located at the surface of view-finder central point, and 8%~12% that the distance between the two central point is view-finder height；
Ears auxiliary line is to be located at the straight line of face auxiliary wire frame both sides, and the ears auxiliary line of arbitrary side is apart from face
It is the 18%~22% of face auxiliary line width of frame to assist the distance of wire frame central point；Eyes auxiliary line is to be assisted perpendicular to ears
The straight line of line, eyes auxiliary line apart from face auxiliary wire frame on vertex distance be face auxiliary line frame major diameter 40%~
45%.
2. a kind of photo method of cutting out based on recognition of face according to claim 1, which is characterized in that when user needs
Image Aspect Ratio be more than 4:When 3, further include：
Step 4：It is more than 4 by length-width ratio of the central point of Face datection frame:The origin of 3 clipping rectangle frame, with the length-width ratio
It is 4:A length of length-width ratio of 3 clipping rectangle frame is more than 4:The length of 3 clipping rectangle frame, the image length-width ratio needed according to user
Example calculates length-width ratio and is more than 4:The wide length of 3 clipping rectangle frame is more than 4 to obtain length-width ratio:3 clipping rectangle
Frame；
Step 5：Length-width ratio described in image is more than 4:Part other than 3 clipping rectangle frame crops.
3. a kind of photo method of cutting out based on recognition of face according to claim 1, which is characterized in that when user needs
Image Aspect Ratio be less than 4:When 3, further include：
Step 4：It is less than 4 by length-width ratio of the central point of Face datection frame:The origin of 3 clipping rectangle frame, with the length-width ratio
It is 4:The width of 3 clipping rectangle frames is that length-width ratio is less than 4:The width of 3 clipping rectangle frame, the image Aspect Ratio needed according to user
It calculates length-width ratio and is less than 4:The length of the length of 3 clipping rectangle frame is less than 4 to obtain length-width ratio:3 clipping rectangle frame；
Step 5：Length-width ratio described in image is less than 4:Part other than 3 clipping rectangle frame crops.
4. a kind of photo cutting system based on recognition of face, which is characterized in that including：
Face detection module carries out Face datection for the image to shooting and obtains Face datection frame；
Length-width ratio is 4：3 clipping rectangle frame generation module is used for using Face datection frame central point as origin, according to area and people
The area ratio 10 of face detection block：7 generation length-width ratios are 4：3 clipping rectangle frame；
Image cropping module, for cropping the part other than clipping rectangle frame described in image；
View-finder auxiliary line display module when for shooting image, shows face auxiliary wire frame, eyes auxiliary line in view-finder
And ears auxiliary line；
Wherein, face auxiliary wire frame is a rectangular wire frame, and the width of face auxiliary wire frame and the width of mobile device view-finder are in the same direction
And to find a view the 0.6~0.7 of width of frame, it is 1 that face, which assists the wide and high ratio of wire frame,：1~1.1:1, face assists wire frame
Central point be located at the surface of view-finder central point, and 8% that the distance between the two central point is view-finder height~
12%；
Ears auxiliary line is to be located at the straight line of face auxiliary wire frame both sides, and the ears auxiliary line of arbitrary side is apart from face
It is the 18%~22% of face auxiliary line width of frame to assist the distance of wire frame central point；Eyes auxiliary line is to be assisted perpendicular to ears
The straight line of line, eyes auxiliary line wide distance on face auxiliary wire frame be face auxiliary line frame height degree 40%~
45%；
Alternatively, face auxiliary wire frame is an oval wire frame, the minor axis of face auxiliary wire frame and the width of view-finder are in the same direction and to find a view
The 0.6~0.7 of width of frame, it is 1 that face, which assists the minor axis of wire frame and the ratio of major diameter,：1~1.1:1, face assists in wire frame
Heart point is located at the surface of view-finder central point, and 8%~12% that the distance between the two central point is view-finder height；
Ears auxiliary line is to be located at the straight line of face auxiliary wire frame both sides, and the ears auxiliary line of arbitrary side is apart from face
It is the 18%~22% of face auxiliary line width of frame to assist the distance of wire frame central point；Eyes auxiliary line is to be assisted perpendicular to ears
The straight line of line, eyes auxiliary line apart from face auxiliary wire frame on vertex distance be face auxiliary line frame major diameter 40%~
45%.
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| CN201410681308.7A CN104361329B (en) | 2014-11-25 | 2014-11-25 | A kind of photo method of cutting out and system based on recognition of face |
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Address after: 610015 floor 13, building 1, No.1268, middle section of Tianfu Avenue, Chengdu high tech Zone, China (Sichuan) pilot Free Trade Zone, Chengdu Patentee after: Chengdu PinGuo Digital Entertainment Ltd. Address before: 610041 C12-16 building, Tianfu Software Park, hi tech Zone, Sichuan, Chengdu Patentee before: Chengdu PinGuo Digital Entertainment Ltd. |