CN106709495A - Image area centering method and device - Google Patents
Image area centering method and device Download PDFInfo
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- CN106709495A CN106709495A CN201710053213.4A CN201710053213A CN106709495A CN 106709495 A CN106709495 A CN 106709495A CN 201710053213 A CN201710053213 A CN 201710053213A CN 106709495 A CN106709495 A CN 106709495A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/20—Image preprocessing
- G06V10/24—Aligning, centring, orientation detection or correction of the image
- G06V10/245—Aligning, centring, orientation detection or correction of the image by locating a pattern; Special marks for positioning
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/20—Image preprocessing
- G06V10/28—Quantising the image, e.g. histogram thresholding for discrimination between background and foreground patterns
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- General Physics & Mathematics (AREA)
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- Theoretical Computer Science (AREA)
- User Interface Of Digital Computer (AREA)
- Position Input By Displaying (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention provides an image area centering method and device. An original image including a target search object is acquired through a camera, wherein the original image includes a cursor projected on the target search object; the distance between current equipment and the target search object is measured and acquired; a deviation value corresponding to the distance is determined according to the pre-established corresponding relationship; and the image area with the cursor acting as the central point can be centered according to the deviation value so that the image area of the position of the cursor can be arranged at the central position of the image when a light projection device and the camera are not arranged on the same axis, and thus the accuracy of the content required to be recognized can be enhanced.
Description
Technical field
The invention belongs to electric terminal technical field, more particularly to a kind of image-region method and apparatus placed in the middle.
Background technology
At present, many e-education products all possess to take pictures and search the function of topic on the market, and topic is searched in order to provide automatic camera
Function, in the close region of camera, one light emitting devices is set, the light that it sends can be incident upon the exercise question that will be searched for
On, show in the form of a cursor, when system identification to the light timestamp, after the image-region in cursor in-scope is intercepted
Topic device is searched in transmission to taking pictures, to recognize the exercise question of the cursor position so that people no longer need cumbersome manual sectional drawing
To carry out searching topic, improve to take pictures and search the efficiency of topic.
However, because the light emitting devices and camera are not on the same axis so that the figure of cursor position
It is not, in the center of image, but have certain skew as region, and the skew is with camera and object search
Distance and change, cause recognized content to there occurs deviation, it is accurate so as to the content of identification required for reducing
Rate.
The content of the invention
In view of this, a kind of image-region method and apparatus placed in the middle be the embodiment of the invention provides, with solve it is existing because
Light emitting devices and camera are not at the image-region of cursor position caused on same axis not in image
Heart position, so as to the relatively low problem of the accuracy rate of the content of identification required for causing.
In a first aspect, the embodiment of the invention provides a kind of image-region method placed in the middle, methods described includes：
Being obtained by camera includes the original image of target search object, described including being incident upon on the original image
Cursor on target search object；
Measure and obtain the distance of current device and the target search object；
Determined with described apart from corresponding deviant according to the corresponding relation for pre-building；
According to the deviant, the image-region that will be put centered on the cursor is placed in the middle.
Second aspect, the embodiment of the invention provides a kind of image-region device placed in the middle, and described device includes：
Image acquisition unit, the original image of target search object, the original graph are included for being obtained by camera
The cursor including being incident upon on the target search object as on；
Range cells, the distance of current device and the target search object is obtained for measuring；
Deviant determining unit, for being determined with described apart from corresponding skew according to the corresponding relation for pre-building
Value；
Image-region unit placed in the middle, for according to the deviant, the image-region that will be put centered on the cursor to be occupied
In.
In embodiments of the present invention, a kind of image-region device placed in the middle is obtained by camera includes target search object
Original image, include being incident upon cursor on the target search object on the original image；Measure and obtain and currently set
The standby distance with the target search object；Determined with described apart from corresponding skew according to the corresponding relation for pre-building
Value；According to the deviant, the image-region that will be put centered on the cursor is placed in the middle, realizes in light projecting apparatus and shooting
Head is not at occuping the image-region of cursor position when on same axis the center of image, so as to improve
Need the accuracy rate of the content of identification.
Brief description of the drawings
Fig. 1 be the embodiment of the present invention one provide a kind of image-region it is placed in the middle realize flow chart；
Fig. 2 be the embodiment of the present invention one provide a kind of corresponding relation set up realize flow chart；
Fig. 3 is the corresponding relation figure of a kind of deviant that the embodiment of the present invention one is provided and distance；
Fig. 4 is the corresponding relation figure for separately planting a kind of deviant and distance that the embodiment of the present invention one is provided；
What Fig. 5 showed a kind of image-region method placed in the middle that the embodiment of the present invention two is provided realizes flow；
What Fig. 6 showed a kind of image-region method placed in the middle that the embodiment of the present invention three is provided realizes flow；
What Fig. 7 showed a kind of image-region method placed in the middle that the embodiment of the present invention four is provided realizes flow；
Fig. 8 shows a kind of specific knot of image-region that the embodiment of the present invention five is provided device 100 placed in the middle
Structure block diagram.
Specific embodiment
To enable that goal of the invention of the invention, feature, advantage are more obvious and understandable, below in conjunction with the present invention
Accompanying drawing in embodiment, is clearly and completely described to the technical scheme in the embodiment of the present invention, it is clear that described reality
It is only a part of embodiment of the invention to apply example, and not all embodiments.Based on the embodiment in the present invention, the common skill in this area
The every other embodiment that art personnel are obtained under the premise of creative work is not made, belongs to the model of present invention protection
Enclose.
Realization of the invention is described in detail below in conjunction with specific embodiment：
Embodiment one
It should be understood that in embodiments of the present invention, the size of the sequence number of above-mentioned each process is not meant to the elder generation of execution sequence
Afterwards, the execution sequence of each process should be with its function and internal logic determination, the implementation process structure without tackling the embodiment of the present invention
Into any restriction.
Fig. 1 shows a kind of flow of realizing of image-region that the embodiment of the present invention one is provided method placed in the middle, and detailed description is such as
Under：
In step S101, being obtained by camera includes the original image of target search object, on above-mentioned original image
Including the cursor being incident upon on above-mentioned target search object.
In embodiments of the present invention, above-mentioned target search object, refer to from paper document, non-paper document or other set
The target search object of standby middle acquisition, for example, it may be certain examination question exercise question, word or sentence in papery examination question etc.,
Can be certain examination question exercise question, word or sentence in other equipment etc.；Other equipment referred herein is not for including
The current device for using, in interior other equipment, can be that liquid crystal display device, LED display, mobile phone or flat board etc. set
It is standby.
Cursor is the light projection sent by the light emitting devices for being arranged on camera close region in target search object
On the cursor that is formed.Herein, the light that the light emitting devices is sent including but not limited to infrared light, laser etc..
In embodiments of the present invention, the transmitting that given shape can be set in light emitting devices is empty, such as cross, circle
The launch hole of shape, rhombus, then in the image that camera shoots, cursor can also show corresponding shape；Or, can pass through
Pattern converter, selects figure set in advance, is passed to light emitting devices and projects on target search object, to meet
The demand of different user.
In step s 102, measure and obtain the distance of current device and above-mentioned target search object.
In embodiments of the present invention, current device is measured with the distance of target search object to obtain two by range cells
The distance between person.When user is being manipulated before camera is allowed to obtain target search object, it is necessary to first adjust light emitting devices
Light launch angle so that the light projection that light emitting devices sends is on target search object, so, current device and mesh
The distance between mark object search can also change accordingly.
In step s 103, determined with above-mentioned apart from corresponding deviant according to the corresponding relation for pre-building.
In embodiments of the present invention, when user's manipulation current device makes the light projection that light emitting devices sends in target search
When on object, the distance between current device and target search object corresponding can also change, when distance changes,
Accordingly, the center of the image-region range image of cursor position just has certain skew, can be according to advance
The corresponding relation of foundation determines the deviant under current distance, as shown in Fig. 2 the present invention implements a kind of corresponding relation for providing
Establishment step is as follows：
In step s 201, the predetermined image under different preset distances is obtained by camera.
Herein, above-mentioned preset distance is preassigned distance, for example, it is 10 centimetres, 20 centimetres, 30 lis that can set
Rice or 50 centimetres, be not specifically limited here.But it is in actual applications, preassigned apart from restricted scope, when advance
When the distance specified is less than the first predetermined threshold value or more than the second predetermined threshold value, the prompting of identification over range is sent.
In step S202, the center of the above-mentioned above-mentioned predetermined image of smooth subject distance is determined according to above-mentioned predetermined image
Deviant.
Herein, deviant is not only only one of which deviant, and refers to the phase under different preset distances
Corresponding multiple deviants, when apart from it is different when, correspondingly, its corresponding deviant is also differed.
Herein, regard predetermined image as a plan, be coordinate starting point [0,0] with the central point of its center,
With its horizontal direction as X-axis, longitudinal direction is Y-axis, it is assumed that the coordinate of one of cursor position is [10,20], so,
We are assured that the deviant of the center of cursor preset distance image.
In step S203, the corresponding relation of above-mentioned preset distance and above-mentioned deviant is set up.
Herein, when the deviant under obtaining a different set of preset distance, by different preset distance and pre- with this
The corresponding deviant record of set a distance in the graph, the corresponding relation of preset distance and deviant, example is set up according to the chart
Such as, it is assumed that deviant is P, preset distance is L, and its corresponding relation can be as shown in Figure 3 or Figure 4.
In step S104, according to above-mentioned deviant, the image-region that will be put centered on above-mentioned cursor is placed in the middle.
In embodiments of the present invention, when the deviant under determining current distance according to corresponding relation, according to the deviant
The image-region put centered on cursor is adjusted, the center for alloing it to occupy image.Herein, the tune for being done
The whole center that can be to be moved to the image-region put centered on cursor image, unnecessary or display is incomplete
Dismiss or be arranged to transparent background in part；Or cut the image-region put centered on cursor by default shape
Figure, at this moment, the central point of the preset pattern is also light target central point so that the image-region that should be put centered on cursor is occupy
The center of image.
Herein, above-mentioned preset pattern is preset ratio rectangle.
In embodiments of the present invention, being obtained by camera includes the original image of target search object, above-mentioned original graph
The cursor including being incident upon on above-mentioned target search object as on；Current device is measured and obtained with above-mentioned target search object
Distance；Determined with above-mentioned apart from corresponding deviant according to the corresponding relation for pre-building；According to above-mentioned deviant, by more than
State the image-region put centered on cursor placed in the middle, realize when light projecting apparatus and camera are not on same axis, will
The image-region of cursor position occupy the center of image, so as to improve the accuracy rate of the content of required identification.
Embodiment two
Fig. 5 shows a kind of flow of realizing of image-region that the embodiment of the present invention two is provided method placed in the middle, and detailed description is such as
Under：
In step S301, being obtained by camera includes the original image of target search object, on above-mentioned original image
Including the cursor being incident upon on above-mentioned target search object.
In step s 302, measure and obtain the distance of current device and above-mentioned target search object.
In step S303, determined with above-mentioned apart from corresponding deviant according to the corresponding relation for pre-building.
In step s 304, according to above-mentioned deviant, the image-region that will be put centered on above-mentioned cursor is placed in the middle.
In step S305, the cursor in above-mentioned image-region is removed, above-mentioned smooth target image is not included to be formed.
In embodiments of the present invention, cursor position and its colourity are recognized, this is understood by specific color removal means
Light target color, makes it occur without in the picture, is interfered with avoiding the cursor from showing in the picture, reduces identification accurate
Degree.
Herein, specific color can determine according to the pixel of light target color or identification content.
Embodiment three
Fig. 6 shows a kind of flow of realizing of image-region that the embodiment of the present invention three is provided method placed in the middle, and detailed description is such as
Under：
In step S401, being obtained by camera includes the original image of target search object, on above-mentioned original image
Including the cursor being incident upon on above-mentioned target search object；
In step S402, the brightness value of current environment is obtained, above-mentioned smooth target luminous intensity is adjusted according to above-mentioned brightness value.
In embodiments of the present invention, when the brightness value of ambient light is excessive, it is easily caused during light is marked on original image and shows
It is unclear, so that can not realize being accurately positioned, at this moment, it is necessary to light target luminous intensity is adjusted according to current brightness value,
Can clearly be shown in original image, so that cursor can be accurately positioned, so as to improve the accurate of identification content
Rate.
In step S403, the distance of current device and above-mentioned target search object is measured and obtained；
In step s 404, determined with above-mentioned apart from corresponding deviant according to the corresponding relation for pre-building；
In step S405, according to above-mentioned deviant, the image-region that will be put centered on above-mentioned cursor is placed in the middle.
In embodiments of the present invention, by obtaining the brightness value of current environment, above-mentioned cursor is adjusted according to above-mentioned brightness value
Luminous intensity, it is possible to achieve under different brightness value environment so that cursor can clearly show in original image, so as to cursor
Can be accurately positioned, so as to improve the accuracy rate of identification content.
Example IV
Fig. 7 shows a kind of flow of realizing of image-region that the embodiment of the present invention four is provided method placed in the middle, and detailed description is such as
Under：
In step S501, being obtained by camera includes the original image of target search object, on above-mentioned original image
Including the cursor being incident upon on above-mentioned target search object.
In step S502, the distance of current device and above-mentioned target search object is measured and obtained.
In step S503, treatment is focused to above-mentioned cursor according to above-mentioned distance, so that above-mentioned cursor clearly shows
Show on above-mentioned target search object.
In the embodiment of the present invention, the degree of divergence of the light sent by light emitting devices is different, when distance is more remote,
Its degree of divergence is bigger, it is possible to cause cursor smudgy, so as to cause cursor to be accurately positioned, herein, Ke Yitong
Cross and treatment is focused to cursor so that it can be most clearly shown on target search object, to realize being accurately positioned.
In step S504, determined with above-mentioned apart from corresponding deviant according to the corresponding relation for pre-building.
In step S505, according to above-mentioned deviant, the image-region that will be put centered on above-mentioned cursor is placed in the middle.
In embodiments of the present invention, treatment is focused to above-mentioned cursor by according to above-mentioned distance, so that above-mentioned cursor
It is most clearly shown on above-mentioned target search object, so that cursor can be accurately positioned, so as to improve the standard of identification content
True rate.
It should be understood that in embodiments of the present invention, the size of the sequence number of above-mentioned each process is not meant to the elder generation of execution sequence
Afterwards, the execution sequence of each process should be with its function and internal logic determination, the implementation process structure without tackling the embodiment of the present invention
Into any restriction.
One of ordinary skill in the art will appreciate that realize that all or part of step in the various embodiments described above method is can
Completed with instructing the hardware of correlation by program, corresponding program can be stored in a computer read/write memory medium
In, above-mentioned storage medium, such as ROM/RAM, disk or CD.
Embodiment five
Fig. 8 shows a kind of concrete structure block diagram of image-region that the embodiment of the present invention five is provided device 100 placed in the middle,
For convenience of description, illustrate only the part related to the embodiment of the present invention.
A kind of image-region provided in an embodiment of the present invention device 100 placed in the middle, including image acquisition unit 110, range finding
Unit 120, deviant determining unit 130 and image-region unit 140 placed in the middle.
Wherein, image acquisition unit 110, the original image of target search object is included for being obtained by camera, on
Stating includes the cursor being incident upon on above-mentioned target search object on original image；
Range cells 120, the distance of current device and above-mentioned target search object is obtained for measuring；
Deviant determining unit 130, for being determined with above-mentioned apart from corresponding inclined according to the corresponding relation that pre-builds
Shifting value；
Image-region unit 140 placed in the middle, for according to above-mentioned deviant, the image-region that will be put centered on above-mentioned cursor
Between two parties.
Further, said apparatus also set up unit including corresponding relation, and above-mentioned corresponding relation sets up unit to be included：
Predetermined image obtains subelement, for obtaining the predetermined image under different preset distances by camera；
Deviant determination subelement, in determining the above-mentioned above-mentioned predetermined image of smooth subject distance according to above-mentioned predetermined image
The deviant of heart position；
Corresponding relation sets up unit, the corresponding relation for setting up above-mentioned preset distance and above-mentioned deviant..
Further, said apparatus also include：
Cursor clearing cell, above-mentioned smooth target image is not included for removing the light in above-mentioned image-region and being marked with to be formed,
To not be sent to pattern recognition device including above-mentioned smooth target image.
Further, said apparatus also include：
Luminous intensity adjustment unit, the brightness value for obtaining current environment adjusts above-mentioned smooth target according to above-mentioned brightness value
Luminous intensity.
Further, said apparatus also include：
Focusing unit, for being focused treatment to above-mentioned cursor according to above-mentioned distance, so that above-mentioned cursor is clear
Be displayed on above-mentioned target search object.
In embodiments of the present invention, image-region device placed in the middle is obtained by camera includes the original of target search object
Beginning image, includes the cursor being incident upon on above-mentioned target search object on above-mentioned original image；Measure and obtain current device with
The distance of above-mentioned target search object；Determined with above-mentioned apart from corresponding deviant according to the corresponding relation for pre-building；Root
According to above-mentioned deviant, the image-region that will be put centered on above-mentioned cursor is placed in the middle, realizes in light projecting apparatus and camera not
When on same axis, the image-region of cursor position is occupy the center of image, it is required so as to improve
The accuracy rate of the content of identification.
Those of ordinary skill in the art are it is to be appreciated that the list of each example described with reference to the embodiments described herein
Unit and step, can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually with hard
Part or software mode are performed, depending on the application-specific and design constraint of technical scheme.Professional and technical personnel can be with
Realize described function, but this realization it is not considered that beyond this hair using different device to each specific application
Bright scope.
It is apparent to those skilled in the art that, for convenience and simplicity of description, the device of foregoing description
With the specific work process of unit, the corresponding process in aforementioned means embodiment is may be referred to, will not be repeated here.
In several embodiments provided herein, it should be understood that disclosed apparatus and method, can be by it
Its mode is realized.For example, device embodiment described above is only schematical, for example, the division of said units, only
Only a kind of division of logic function, can there is other dividing mode when actually realizing, such as multiple units or component can be tied
Another system is closed or is desirably integrated into, or some features can be ignored, or do not perform.It is another, it is shown or discussed
Coupling each other or direct-coupling or communication connection can be the INDIRECT COUPLINGs or logical of device or unit by some interfaces
Letter connection, can be electrical, mechanical or other forms.
The above-mentioned unit that is illustrated as separating component can be or may not be it is physically separate, it is aobvious as unit
The part for showing can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
On NE.Some or all of unit therein can be according to the actual needs selected to realize the mesh of this embodiment scheme
's.
In addition, during each functional unit in each embodiment of the invention can be integrated in a processing unit, it is also possible to
It is that unit is individually physically present, it is also possible to which two or more units are integrated in a unit.
If above-mentioned functions are to realize in the form of SFU software functional unit and as independent production marketing or when using, can be with
Storage is in a computer read/write memory medium.Based on such understanding, technical scheme is substantially in other words
The part contributed to prior art or the part of the technical scheme can be embodied in the form of software product, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used to so that a computer equipment (can be individual
People's computer, server, or network equipment etc.) perform all or part of step of each embodiment said apparatus of the invention.
And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (ROM, Read-Only Memory), arbitrary access are deposited
Reservoir (RAM, Random Access Memory), magnetic disc or CD etc. are various can be with the medium of store program codes.
The above, specific embodiment only of the invention, but protection scope of the present invention is not limited thereto, and it is any
Those familiar with the art the invention discloses technical scope in, state or replacement can be readily occurred in, should all contain
Cover within protection scope of the present invention.Therefore, protection scope of the present invention is answered and above-mentioned is defined by scope of the claims.
Claims (10)
1. a kind of image-region method placed in the middle, it is characterised in that methods described includes：
Being obtained by camera includes the original image of target search object, includes being incident upon the target on the original image
Cursor on object search；
Measure and obtain the distance of current device and the target search object；
Determined with described apart from corresponding deviant according to the corresponding relation for pre-building；
According to the deviant, the image-region that will be put centered on the cursor is placed in the middle.
2. the method for claim 1, it is characterised in that the establishment step of the corresponding relation for pre-building includes：
Predetermined image under different preset distances is obtained by camera；
The deviant of the center of predetermined image according to the predetermined image determines the smooth subject distance；
Set up the corresponding relation of the preset distance and the deviant.
3. method as claimed in claim 1 or 2, it is characterised in that described according to the deviant, will be designated as with the light
After the image-region of central point step placed in the middle, also include：
Removing the light in described image region and being marked with to be formed does not include the smooth target image, and the smooth target is not included by described in
Image is sent to pattern recognition device.
4. method as claimed in claim 1 or 2, it is characterised in that include target search pair in described acquisition by camera
While the original image step of elephant, also include：
The brightness value of current environment is obtained, the smooth target luminous intensity is adjusted according to the brightness value.
5. method as claimed in claim 1 or 2, it is characterised in that in acquisition current device and the target search pair
Elephant after step, also include：
Treatment is focused to the cursor according to the distance, so that the cursor is most clearly shown in the target search pair
As upper.
6. a kind of image-region device placed in the middle, it is characterised in that described device includes：
Image acquisition unit, includes the original image of target search object, on the original image for being obtained by camera
Including the cursor being incident upon on the target search object；
Range cells, the distance of current device and the target search object is obtained for measuring；
Deviant determining unit, for being determined with described apart from corresponding deviant according to the corresponding relation for pre-building；
Image-region unit placed in the middle, for according to the deviant, the image-region that will be put centered on the cursor to be placed in the middle.
7. device as claimed in claim 6, it is characterised in that described device also sets up unit including corresponding relation, described right
Should be related to that setting up unit includes：
Predetermined image obtains subelement, for obtaining the predetermined image under different preset distances by camera；
Deviant determination subelement, for the centre bit of predetermined image described in determining the smooth subject distance according to the predetermined image
The deviant put；
Corresponding relation sets up unit, the corresponding relation for setting up the preset distance and the deviant..
8. device as claimed in claims 6 or 7, it is characterised in that described device also includes：
Cursor clearing cell, does not include the smooth target, by described in not for removing the light in described image region and being marked with to be formed
Sent to pattern recognition device including the smooth target image.
9. device as claimed in claims 6 or 7, it is characterised in that described device also includes：
Luminous intensity adjustment unit, the brightness value for obtaining current environment adjusts the smooth target light intensity according to the brightness value
Degree.
10. device as claimed in claims 6 or 7, it is characterised in that described device also includes：
Focusing unit, for being focused treatment to the cursor according to the distance, so that the cursor clearly shows
Show on the target search object.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110895372A (en) * | 2018-09-13 | 2020-03-20 | 浙江宇视科技有限公司 | Optical axis deviation calibration method and related device |
| CN111385489A (en) * | 2020-03-20 | 2020-07-07 | 百度在线网络技术（北京）有限公司 | Method, device and equipment for manufacturing short video cover and storage medium |
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