CN105160632B - A kind of distortion correction method and mobile terminal - Google Patents
A kind of distortion correction method and mobile terminal Download PDFInfo
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- CN105160632B CN105160632B CN201510382676.6A CN201510382676A CN105160632B CN 105160632 B CN105160632 B CN 105160632B CN 201510382676 A CN201510382676 A CN 201510382676A CN 105160632 B CN105160632 B CN 105160632B
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Abstract
The invention discloses a kind of bearing calibration of distortion, this method also includes：Obtain the image that the wide-angle lens of mobile terminal is shot；The center pixel grid of described image is obtained according to pre-set dimension；By described image be divided into the N number of pixel grid of center pixel size of mesh opening identical, wherein, N is integer more than or equal to 2；Using the center pixel grid as N number of pixel grid described in distortion correction N Reference Alignment, to obtain correction chart picture.The embodiment of the present invention additionally provides a kind of mobile terminal.Can a certain degree of distortion for correcting the image that wide-angle lens is shot using the embodiment of the present invention.
Description
Technical field
The present invention relates to technical field of image processing, more particularly to a kind of distortion correction method and mobile terminal.
Background technology
Due to the physical nonlinearity feature of camera lens, shape of material objects is inevitably caused in imaging process in figure
As upper distortion, specific manifestation can be divided into pincushion distortion, barrel distortion and linear distortion.Because the presence of distortion not only influences to adopt
Collect the visual effect of image, and if be applied directly on industrial Photogrammetry, it will reduction camera measurement precision, Jin Erying
Ring result.Relative to common lens, the distortion of wide-angle lens is larger, is due to that distortion only has with thing high (or angle of visual field size)
Close, wide-angle lens becomes big relative to the common lens angle of visual field, and then relative to the increase of common lens distortion degree.
Therefore, work out and a kind of the bearing calibration of line distortion is entered to the image that wide-angle lens is shot become to become more and more important.
The content of the invention
The embodiment of the present invention provides bearing calibration and the mobile terminal of a kind of distortion, for a certain degree of big visual angle of correction
The distortion of the image of lens shooting.
First aspect present invention provides a kind of bearing calibration of distortion, including：
Obtain the image that the wide-angle lens of mobile terminal is shot；
The center pixel grid of described image is obtained according to pre-set dimension；
By described image be divided into the N number of pixel grid of center pixel size of mesh opening identical, wherein, N be more than
Integer equal to 2；
Using the center pixel grid as N number of pixel grid described in distortion correction N Reference Alignment, to obtain correction chart picture.
It is described with the central picture in the first possible implementation of first aspect with reference to first aspect present invention
Plain grid as N number of pixel grid described in distortion correction N Reference Alignment, including：
N number of pixel grid is obtained to the lateral separation and fore-and-aft distance of the center pixel grid；
According to the lateral separation and fore-and-aft distance of N number of pixel grid to the center pixel grid, conversion and the N
The corresponding lateral aberration extent index of individual pixel grid and longitudinal distortion extent index；
According to corresponding with the N number of pixel grid lateral aberration extent index and longitudinal distortion extent index to institute
State N number of pixel grid and carry out distortion correction.
With reference to the first possible implementation of first aspect present invention, second in first aspect may implementation
In, corresponding with the N number of pixel grid lateral aberration extent index and longitudinal distortion extent index are to institute described in the basis
State N number of pixel grid and carry out distortion correction, including：
It is abnormal according to distortion correction model and the lateral aberration extent index corresponding with the N number of pixel grid and longitudinal direction
Become extent index, it is determined that lateral aberration correcting value corresponding with the N number of pixel grid and longitudinal distortion correcting value；
According to lateral aberration correcting value corresponding with the N number of pixel grid and longitudinal distortion correcting value to N number of pixel
Grid carries out distortion correction.
With reference to first aspect present invention, first aspect present invention the first or second may implementation, first
It is described to be divided into described image and the center pixel size of mesh opening identical N in the third possible implementation of aspect
Individual pixel grid, including：
Described image is subjected to gridding processing according to pre-set dimension, it is identical with the center pixel size of mesh opening to obtain
N number of pixel grid.
With reference to first aspect present invention, first aspect present invention the first to the third any possible implementation,
In the 4th kind of possible implementation of first aspect, it is described according to pre-set dimension obtain described image center pixel grid it
Before, the bearing calibration also includes：
Judge whether the distortion degree of described image is more than or equal to default distortion threshold value；
Wherein, the center pixel grid for obtaining described image according to pre-set dimension includes, in the distortion of described image
In the case that degree is more than or equal to default distortion threshold value, the center pixel grid of described image is obtained according to pre-set dimension.
Second aspect of the present invention provides a kind of mobile terminal, including：
First acquisition unit, for obtaining the image that the wide-angle lens of mobile terminal is shot；
Second acquisition unit, the center pixel grid for obtaining described image according to pre-set dimension；
Division unit, the described image for the first acquisition unit to be got is divided into and the center pixel net
The N number of pixel grid of lattice size identical, wherein, N is the integer more than or equal to 2；
Unit is corrected, for being used as distortion correction base using the center pixel grid that the second acquisition unit is got
Quasi- correction N number of pixel grid, to obtain correction chart picture.
With reference to second aspect of the present invention, in the first possible implementation of second aspect, the correction unit is specific
For：
N number of pixel grid is obtained to the lateral separation and fore-and-aft distance of the center pixel grid；
According to the lateral separation and fore-and-aft distance of N number of pixel grid to the center pixel grid, conversion and the N
The corresponding lateral aberration extent index of individual pixel grid and longitudinal distortion extent index；
According to corresponding with the N number of pixel grid lateral aberration extent index and longitudinal distortion extent index to institute
State N number of pixel grid and carry out distortion correction.
With reference to the first possible implementation of second aspect of the present invention, second in second aspect may implementation
In, it is described correction unit specifically for：
It is abnormal according to distortion correction model and the lateral aberration extent index corresponding with the N number of pixel grid and longitudinal direction
Become extent index, it is determined that lateral aberration correcting value corresponding with the N number of pixel grid and longitudinal distortion correcting value；
According to lateral aberration correcting value corresponding with the N number of pixel grid and longitudinal distortion correcting value to N number of pixel
Grid carries out distortion correction.
With reference to second aspect of the present invention, second aspect of the present invention the first or second may implementation, second
In the third possible implementation of aspect, the division unit specifically for：
Described image is subjected to gridding processing according to pre-set dimension, it is identical with the center pixel size of mesh opening to obtain
N number of pixel grid.
With reference to second aspect of the present invention, second aspect of the present invention the first to the third possible implementation, second
In 4th kind of possible implementation of aspect, the mobile terminal also includes：
Judging unit, for judging whether the distortion degree of described image is more than or equal to default distortion threshold value；
Wherein, the second acquisition unit specifically for：It is more than or equal to default distortion in the distortion degree of described image
In the case of threshold value, the center pixel grid of described image is obtained according to pre-set dimension.
Implement the embodiment of the present invention, have the advantages that：
In the embodiment of the present invention, because lens distortion is actually the general name of the intrinsic perspective distortion of optical lens, also
It is that is, distortion is the intrinsic defect of optical lens, and distortion can only reduce and can not be eliminated because the distortion that transillumination is caused,
Therefore by optical lens shoot come image all can exist distort, simply the problem of distortion degree size, for big visual angle
The distortion degree for the image border that lens shooting comes out is larger, and closer to centre, distortion is smaller, therefore the present invention is according to default chi
It is very little to obtain the image center pixel grid that wide-angle lens is shot, described image is divided into and the center pixel size of mesh opening
The N number of pixel grid of identical, wherein, N is the integer more than or equal to 2, is then used as distortion correction using the center pixel grid
N number of pixel grid described in N Reference Alignment, to obtain correction chart picture, and then a certain degree of can correct the figure that wide-angle lens is shot
The distortion of picture.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the first embodiment flow chart of the bearing calibration of distortion provided in an embodiment of the present invention；
Fig. 2 is the second embodiment flow chart of the bearing calibration of distortion provided in an embodiment of the present invention；
Fig. 3 is the 3rd embodiment flow chart of the bearing calibration of distortion provided in an embodiment of the present invention；
Fig. 4 is the first embodiment structural representation of mobile terminal provided in an embodiment of the present invention；
Fig. 5 is the second embodiment structural representation of mobile terminal provided in an embodiment of the present invention.
Embodiment
The embodiment of the present invention provides bearing calibration and the mobile terminal of a kind of distortion, for a certain degree of big visual angle of correction
The distortion of the image of lens shooting.
In order that those skilled in the art more fully understand the present invention program, below in conjunction with the embodiment of the present invention
Accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, should all belong to the model that the present invention is protected
Enclose.
It is described in detail individually below.
Term " first ", " second ", " the 3rd " in description and claims of this specification and the accompanying drawing and "
Four " etc. be to be used to distinguish different objects, rather than for describing particular order.In addition, term " comprising " and " having " and it
Any deformation, it is intended that covering non-exclusive is included.For example contain the process of series of steps or unit, method, be
The step of system, product or equipment are not limited to list or unit, but the step of alternatively also include not listing or list
Member, or alternatively also include for the intrinsic other steps of these processes, method, product or equipment or unit.
The one embodiment for the bearing calibration that the present invention distorts.Wherein, a kind of bearing calibration of distortion：Obtain mobile terminal
Wide-angle lens shoot image；The center pixel grid of described image is obtained according to pre-set dimension；Described image is divided
For with the N number of pixel grid of center pixel size of mesh opening identical, wherein, N is integer more than or equal to 2；With the center
Pixel grid is as N number of pixel grid described in distortion correction N Reference Alignment, to obtain correction chart picture.
Referring first to Fig. 1, Fig. 1 is a kind of first embodiment flow of the bearing calibration of distortion provided in an embodiment of the present invention
Figure.Wherein, as shown in figure 1, a kind of bearing calibration for distortion that one embodiment of the present of invention is provided can include step S101
~S104：
The image that S101, the wide-angle lens of acquisition mobile terminal are shot.
In one embodiment, the image embodiment for obtaining the wide-angle lens shooting of mobile terminal can be mobile
Terminal directly obtain be stored in mobile terminal it is local in the image that shoots of wide-angle lens or mobile terminal from high in the clouds
The image that wide-angle lens is shot is obtained in server.
In another embodiment, the image embodiment for obtaining the wide-angle lens shooting of mobile terminal can be moved
Dynamic terminal starts the big visual angle camera of mobile terminal, object is shot by above-mentioned big visual angle camera to be clapped
Take the photograph image.
Wherein, the wide-angle lens of above-mentioned mobile terminal for example can be wide-angle lens, fish eye lens and dual camera
The wide-angle lens module of composition, the wide-angle lens can be arranged on the tip position of mobile terminal, and be used as rearmounted shooting
Head or front camera, can also be arranged on the rotating mechanism of mobile terminal and form revolving wide-angle lens module, and
The camera lens visual angle of the wide-angle lens for example can be 120 degree, can realize the effect of wide-angle.
Wherein, above-mentioned mobile terminal for example can be it is following in any one or whole, smart phone, wearable set
Standby (personal maincenter), personal or mobile multimedia player, personal digital assistant (PDA), laptop computer, tablet personal computer,
Smartbook, palmtop computer and similar personal electronic equipments, above-mentioned mobile terminal can include network interface, processing
Device, memory, audio frequency processing circuit, microphone, camera, flash lamp, and including can internally or outside audio is put
Big device and the loudspeaker unit including being connected to audio-frequency amplifier.
S102, the center pixel grid according to pre-set dimension acquisition described image.
Wherein, above-mentioned pre-set dimension for example can be 100*100 pixels, 200*200 pixels, 400*400 pixels, 500*
500 pixels or other values.
In the embodiment of the present invention, if pre-set dimension is 100*100 pixels, mobile terminal is obtained according to 100*100 pixels
State the center pixel grid for the image that step S101 is got.Due to the intrinsic characteristic of optical lens, closer to the figure of intermediate point
It is almost negligible to disregard as region distortion degree is smaller, thus the center pixel grid can distortion correction the most benchmark, it is mobile
Terminal can be corrected according to center pixel grid to the pixel grid in addition to itself.Wherein, pixel grid is by many
The cell of individual pixel composition；The cell that center pixel grid is pointed out for the centre of above-mentioned image.
S103, by described image be divided into the N number of pixel grid of center pixel size of mesh opening identical, wherein, N is
Integer more than or equal to 2.
In the embodiment of the present invention, due to whole image carry out distortion correction, and be by center pixel grid benchmark the most,
Therefore need to be divided into whole image with the above-mentioned multiple pixel grids of center pixel size of mesh opening identical, above-mentioned image is drawn
The embodiment being divided into the N number of pixel grid of center pixel size of mesh opening identical can be by described image according to
Pre-set dimension carries out gridding processing, to obtain and the above-mentioned N number of pixel grid of center pixel size of mesh opening identical.
S104, using the center pixel grid as N number of pixel grid described in distortion correction N Reference Alignment, to be corrected
Image.
In the embodiment of the present invention, mobile terminal is used as distortion correction using the center pixel grid that above-mentioned steps S102 is got
Benchmark, and N number of pixel grid that above-mentioned steps S103 is got is corrected according to default aberration correction algorithm, Ran Houyi
Dynamic terminal is integrated the N number of pixel grid and center pixel grid after correction with the image after being corrected.Wherein, preset
Aberration correction algorithm can for example include：Multinomial coordinate transformation algorithm, Polynomials Piecewise approximate algorithm, net template method are calculated
Method, net template method algorithm, equivalent Sphere Measurement Model method, net template slicing algorithm or other aberration correction algorithms.
In one embodiment, N number of pixel grid tool described in distortion correction N Reference Alignment is used as using the center pixel grid
Body embodiment can be the lateral separation and fore-and-aft distance for obtaining N number of pixel grid to the center pixel grid；Root
According to the lateral separation and fore-and-aft distance of N number of pixel grid to the center pixel grid, conversion and N number of pixel grid
Corresponding lateral aberration extent index and longitudinal distortion extent index；According to the transverse direction corresponding with the N number of pixel grid
Distortion degree parameter and longitudinal distortion extent index carry out distortion correction to N number of pixel grid.
In another embodiment, according to the lateral aberration extent index corresponding with the N number of pixel grid and vertical
It can be according to default distortion model that distortion correction embodiment is carried out to N number of pixel grid to distortion degree parameter
With corresponding with the N number of pixel grid lateral aberration extent index and longitudinal distortion extent index, it is determined that with it is described N number of
Pixel grid correspondence lateral aberration correcting value and longitudinal distortion correcting value；According to lateral aberration corresponding with the N number of pixel grid
Correcting value and longitudinal distortion correcting value carry out distortion correction to N number of pixel grid.
In the embodiment of the present invention, because lens distortion is actually the general name of the intrinsic perspective distortion of optical lens, also
It is that is, distortion is the intrinsic defect of optical lens, and distortion can only reduce and can not be eliminated because the distortion that transillumination is caused,
Therefore by optical lens shoot come image all can exist distort, simply the problem of distortion degree size, for big visual angle
The distortion degree for the image border that lens shooting comes out is larger, and closer to centre, distortion is smaller, therefore the present invention is according to default chi
It is very little to obtain the image center pixel grid that wide-angle lens is shot, described image is divided into and the center pixel size of mesh opening
The N number of pixel grid of identical, wherein, N is the integer more than or equal to 2, is then used as distortion correction using the center pixel grid
N number of pixel grid described in N Reference Alignment, to obtain correction chart picture, and then a certain degree of can correct the figure that wide-angle lens is shot
The distortion of picture.
Optionally, before the center pixel grid of described image is obtained according to pre-set dimension, the distortion correction shown in Fig. 1
Method also includes：Judge whether the distortion degree of described image is more than or equal to default distortion threshold value；Wherein, according to pre-set dimension
Obtaining the center pixel grid of described image includes, and is more than or equal to the feelings of default distortion threshold value in the distortion degree of described image
Under condition, the center pixel grid of described image is obtained according to pre-set dimension.
Fig. 2 is referred to, Fig. 2 is a kind of second embodiment flow of the bearing calibration of distortion provided in an embodiment of the present invention
Figure.Wherein, as shown in Fig. 2 a kind of bearing calibration for distortion that one embodiment of the present of invention is provided can include step S201
~S207：
The image that S201, the wide-angle lens of acquisition mobile terminal are shot.
In one embodiment, the image embodiment for obtaining the wide-angle lens shooting of mobile terminal can be mobile
Terminal directly obtain be stored in mobile terminal it is local in the image that shoots of wide-angle lens or mobile terminal from high in the clouds
The image that wide-angle lens is shot is obtained in server.
In another embodiment, the image embodiment for obtaining the wide-angle lens shooting of mobile terminal can be moved
Dynamic terminal starts the big visual angle camera of mobile terminal, object is shot by above-mentioned big visual angle camera to be clapped
Take the photograph image.
Wherein, the wide-angle lens of above-mentioned mobile terminal for example can be wide-angle lens, fish eye lens and dual camera
The wide-angle lens module of composition, the wide-angle lens can be arranged on the tip position of mobile terminal, and be used as rearmounted shooting
Head or front camera, can also be arranged on the rotating mechanism of mobile terminal and form revolving wide-angle lens module, and
The camera lens visual angle of the wide-angle lens for example can be 120 degree, can realize the effect of wide-angle.
Wherein, above-mentioned mobile terminal for example can be it is following in any one or whole, smart phone, wearable set
Standby (personal maincenter), personal or mobile multimedia player, personal digital assistant (PDA), laptop computer, tablet personal computer,
Smartbook, palmtop computer and similar personal electronic equipments, above-mentioned mobile terminal can include network interface, processing
Device, memory, audio frequency processing circuit, microphone, camera, flash lamp, and including can internally or outside audio is put
Big device and the loudspeaker unit including being connected to audio-frequency amplifier.
S202, the center pixel grid according to pre-set dimension acquisition described image.
S203, by described image according to pre-set dimension carry out gridding processing, to obtain and the center pixel grid chi
The very little N number of pixel grid of identical.
S204, acquisition N number of pixel grid to the center pixel grid lateral separation and fore-and-aft distance.
S205, lateral separation and fore-and-aft distance according to N number of pixel grid to the center pixel grid, conversion with
The corresponding lateral aberration extent index of N number of pixel grid and longitudinal distortion extent index.
S206, according to default distortion correction model and the lateral aberration degree corresponding with the N number of pixel grid
Parameter and longitudinal distortion extent index, it is determined that lateral aberration correcting value corresponding with the N number of pixel grid and longitudinal distortion are corrected
Amount.
S207, according to lateral aberration correcting value corresponding with the N number of pixel grid and longitudinal distortion correcting value to described N number of
Pixel grid carries out distortion correction.
Specifically, mobile terminal first obtains above-mentioned steps S201 according to pre-set dimension (such as 100*100 pixels) and got
Wide-angle lens shoot image center pixel grid；Then the image that mobile terminal gets above-mentioned steps S201 by
Gridding processing is carried out according to 100*100 pixels, to obtain and the above-mentioned N number of pixel grid of center pixel size of mesh opening identical；Connect
Mobile terminal point centered on above-mentioned center pixel grid, the two-dimensional coordinate of N number of pixel grid, i.e., N number of pixel grid is obtained
To the lateral separation and fore-and-aft distance of center pixel grid；Mobile terminal is according to default distance and the ratio of distortion degree parameter
With the lateral separation and fore-and-aft distance of above-mentioned N number of pixel grid to the center pixel grid, conversion and above-mentioned N number of pixel grid
Corresponding lateral aberration extent index and longitudinal distortion extent index；Mobile terminal is by the corresponding transverse direction of above-mentioned N number of pixel grid
Distortion degree parameter and longitudinal distortion extent index substitute into distortion correction model set in advance, to determine and above-mentioned N number of pixel
Grid correspondence lateral aberration correcting value and longitudinal distortion correcting value；N number of picture that last mobile terminal determines above-mentioned steps S206
Plain grid correspondence lateral aberration correcting value and longitudinal distortion correcting value substitute into default distortion algorithm, and (such as net template burst is calculated
Method) to reach the above-mentioned N number of pixel grid of correction, then the N number of pixel grid and center pixel grid after correction are integrated
With the image after being corrected.
Wherein, what above-mentioned distortion degree parameter was represented is the amount of distortion degree of the current location relative to center pixel grid
Change value.
Wherein, the coordinate for the image that the presence obtained according to shooting distorts, above-mentioned image pair is calculated according to distortion model
The coordinate answered, that is, establish the difference between the mapping relations between fault image coordinate and correction image coordinate, the two coordinates
Pixel coordinate offset (i.e. distortion correction amount) when value is exactly distortion correction.
In the embodiment of the present invention, because lens distortion is actually the general name of the intrinsic perspective distortion of optical lens, also
It is that is, distortion is the intrinsic defect of optical lens, and distortion can only reduce and can not be eliminated because the distortion that transillumination is caused,
Therefore by optical lens shoot come image all can exist distort, simply the problem of distortion degree size, for big visual angle
The distortion degree for the image border that lens shooting comes out is larger, and closer to centre, distortion is smaller, therefore the present invention is according to default chi
It is very little to obtain the image center pixel grid that wide-angle lens is shot, described image is divided into and the center pixel size of mesh opening
The N number of pixel grid of identical, wherein, N is the integer more than or equal to 2, then obtains N number of pixel grid to the central picture
The lateral separation and fore-and-aft distance of plain grid；According to the lateral separation of N number of pixel grid to the center pixel grid and
Fore-and-aft distance, conversion lateral aberration extent index corresponding with the N number of pixel grid and longitudinal distortion extent index；According to abnormal
Become correcting algorithm and the lateral aberration extent index corresponding with the N number of pixel grid and longitudinal distortion extent index, really
Fixed lateral aberration correcting value corresponding with the N number of pixel grid and longitudinal distortion correcting value；According to N number of pixel grid pair
Lateral aberration correcting value and longitudinal distortion correcting value is answered to carry out distortion correction to N number of pixel grid, to obtain correction chart picture,
And then can a certain degree of distortion for correcting the image that wide-angle lens is shot.
Fig. 3 is referred to, Fig. 3 is a kind of 3rd embodiment flow of the bearing calibration of distortion provided in an embodiment of the present invention
Figure.Wherein, as shown in figure 3, a kind of bearing calibration for distortion that one embodiment of the present of invention is provided can include step S301
~S308：
The image that S301, the wide-angle lens of acquisition mobile terminal are shot.
In one embodiment, the image embodiment for obtaining the wide-angle lens shooting of mobile terminal can be mobile
Terminal directly obtain be stored in mobile terminal it is local in the image that shoots of wide-angle lens or mobile terminal from high in the clouds
The image that wide-angle lens is shot is obtained in server.
In another embodiment, the image embodiment for obtaining the wide-angle lens shooting of mobile terminal can be moved
Dynamic terminal starts the big visual angle camera of mobile terminal, object is shot by above-mentioned big visual angle camera to be clapped
Take the photograph image.
Wherein, the wide-angle lens of above-mentioned mobile terminal for example can be wide-angle lens, fish eye lens and dual camera
The wide-angle lens module of composition, the wide-angle lens can be arranged on the tip position of mobile terminal, and be used as rearmounted shooting
Head or front camera, can also be arranged on the rotating mechanism of mobile terminal and form revolving wide-angle lens module, and
The camera lens visual angle of the wide-angle lens for example can be 120 degree, can realize the effect of wide-angle.
Wherein, above-mentioned mobile terminal for example can be it is following in any one or whole, smart phone, wearable set
Standby (personal maincenter), personal or mobile multimedia player, personal digital assistant (PDA), laptop computer, tablet personal computer,
Smartbook, palmtop computer and similar personal electronic equipments, above-mentioned mobile terminal can include network interface, processing
Device, memory, audio frequency processing circuit, microphone, camera, flash lamp, and including can internally or outside audio is put
Big device and the loudspeaker unit including being connected to audio-frequency amplifier.
S302, judge whether the distortion degree of described image is more than or equal to default distortion threshold value.
If so, then performing step S303.
If it is not, not making any operation then.
S303, the center pixel grid according to pre-set dimension acquisition described image.
S304, by described image according to pre-set dimension carry out gridding processing, to obtain and the center pixel grid chi
The very little N number of pixel grid of identical.
S305, acquisition N number of pixel grid to the center pixel grid lateral separation and fore-and-aft distance.
S306, lateral separation and fore-and-aft distance according to N number of pixel grid to the center pixel grid, conversion with
The corresponding lateral aberration extent index of N number of pixel grid and longitudinal distortion extent index.
S307, according to distortion correction model and the lateral aberration extent index corresponding with the N number of pixel grid and
Longitudinal distortion extent index, it is determined that lateral aberration correcting value corresponding with the N number of pixel grid and longitudinal distortion correcting value.
S308, according to lateral aberration correcting value corresponding with the N number of pixel grid and longitudinal distortion correcting value to described N number of
Pixel grid carries out distortion correction.
Specifically, before distortion correction is carried out to image, mobile terminal first judges whether above-mentioned image needs correction, on
State step S302 and judge whether the distortion degree of described image is more than or equal to default distortion threshold value embodiment and can be：
Above-mentioned image is substituted into model set in advance, to obtain the average distortion degree value of above-mentioned image, by the above-mentioned figure got
The average distortion degree value of picture is compared with the default distortion threshold value set in advance, if more than or equal to default distortion threshold value, wherein, on
Stating default distortion threshold value for example can be：0.2nd, 0.4,0.8,1,2 or other values, then mobile terminal is first according to pre-set dimension
(such as 100*100 pixels) obtains the center pixel grid of the image for the wide-angle lens shooting that above-mentioned steps S301 is got；
Then the image that mobile terminal gets above-mentioned steps S301 according to 100*100 pixels carry out gridding processing, with obtain with
The above-mentioned N number of pixel grid of center pixel size of mesh opening identical；Then mobile terminal point centered on above-mentioned center pixel grid,
Obtain the two-dimensional coordinate of N number of pixel grid, i.e., the lateral separation and fore-and-aft distance of N number of pixel grid to center pixel grid；Move
Dynamic terminal is according to the ratio and above-mentioned N number of pixel grid of default distance and distortion degree parameter to the center pixel grid
Lateral separation and fore-and-aft distance, conversion lateral aberration extent index corresponding with above-mentioned N number of pixel grid and longitudinal distortion degree
Parameter；Mobile terminal substitutes into the corresponding lateral aberration extent index of above-mentioned N number of pixel grid and longitudinal distortion extent index pre-
The distortion correction model first set, to determine lateral aberration correcting value corresponding with above-mentioned N number of pixel grid and longitudinal distortion correction
Amount；N number of pixel grid correspondence lateral aberration correcting value and longitudinal distortion school that last mobile terminal determines above-mentioned steps S306
Positive quantity substitutes into default distortion algorithm (such as net template slicing algorithm) to reach the above-mentioned N number of pixel grid of correction, then will
N number of pixel grid and center pixel grid after correction are integrated with the image after being corrected.
In the embodiment of the present invention, because lens distortion is actually the general name of the intrinsic perspective distortion of optical lens, also
It is that is, distortion is the intrinsic defect of optical lens, and distortion can only reduce and can not be eliminated because the distortion that transillumination is caused,
Therefore by optical lens shoot come image all can exist distort, simply the problem of distortion degree size, for big visual angle
The distortion degree for the image border that lens shooting comes out is larger, and closer to centre, distortion is smaller, therefore the present invention is according to default chi
It is very little to obtain the image center pixel grid that wide-angle lens is shot, described image is divided into and the center pixel size of mesh opening
The N number of pixel grid of identical, wherein, N is the integer more than or equal to 2, then obtains N number of pixel grid to the central picture
The lateral separation and fore-and-aft distance of plain grid；According to the lateral separation of N number of pixel grid to the center pixel grid and
Fore-and-aft distance, conversion lateral aberration extent index corresponding with the N number of pixel grid and longitudinal distortion extent index；According to abnormal
Become correcting algorithm and the lateral aberration extent index corresponding with the N number of pixel grid and longitudinal distortion extent index, really
Fixed lateral aberration correcting value corresponding with the N number of pixel grid and longitudinal distortion correcting value；According to N number of pixel grid pair
Lateral aberration correcting value and longitudinal distortion correcting value is answered to carry out distortion correction to N number of pixel grid, to obtain correction chart picture,
And then can a certain degree of distortion for correcting the image that wide-angle lens is shot.
In addition, before distortion correction is carried out to image, first judging whether the distortion degree of the image is more than or equal to and presetting
Distortion degree, it is no to be, then line distortion is entered to the image, to mitigate the background process of mobile terminal, so as to reduce mobile terminal
Caton phenomenon.
Fig. 4 is referred to, Fig. 4 is a kind of structural representation of mobile terminal 400 provided in an embodiment of the present invention, and the movement is whole
End includes：
First acquisition unit 401, for obtaining the image that the wide-angle lens of mobile terminal is shot.
Second acquisition unit 402, the center pixel grid for obtaining described image according to pre-set dimension.
Division unit 403, the described image for the first acquisition unit to be got is divided into and the central picture
The plain N number of pixel grid of size of mesh opening identical, wherein, N is the integer more than or equal to 2.
Wherein, above-mentioned division unit 403 specifically for：
Described image is subjected to gridding processing according to pre-set dimension, it is identical with the center pixel size of mesh opening to obtain
N number of pixel grid.
Unit 404 is corrected, the center pixel grid for being got using the second acquisition unit is used as distortion school
N number of pixel grid described in positive N Reference Alignment, to obtain correction chart picture.
Wherein, above-mentioned correction unit 404 specifically for：
N number of pixel grid is obtained to the lateral separation and fore-and-aft distance of the center pixel grid；
According to the lateral separation and fore-and-aft distance of N number of pixel grid to the center pixel grid, conversion and the N
The corresponding lateral aberration extent index of individual pixel grid and longitudinal distortion extent index；
According to corresponding with the N number of pixel grid lateral aberration extent index and longitudinal distortion extent index to institute
State N number of pixel grid and carry out distortion correction.
Wherein, above-mentioned correction unit 404 specifically for：
It is abnormal according to default distortion model and the lateral aberration extent index corresponding with the N number of pixel grid and longitudinal direction
Become extent index, it is determined that lateral aberration correcting value corresponding with the N number of pixel grid and longitudinal distortion correcting value；
According to lateral aberration correcting value corresponding with the N number of pixel grid and longitudinal distortion correcting value to N number of pixel
Grid carries out distortion correction.
Optionally, before the center pixel grid that second acquisition unit 402 obtains described image according to pre-set dimension, institute
Stating mobile terminal also includes：
Judging unit, for judging whether the distortion degree of described image is more than or equal to default distortion threshold value；
Wherein, the second acquisition unit specifically for：It is more than or equal to default distortion in the distortion degree of described image
In the case of threshold value, the center pixel grid of described image is obtained according to pre-set dimension.
It is understood that the function of each functional module of the mobile terminal 400 of the present embodiment can be real according to methods described
The method applied in example is implemented, and it implements the associated description that process is referred to methods described embodiment, herein no longer
Repeat.
In the embodiment of the present invention, because lens distortion is actually the general name of the intrinsic perspective distortion of optical lens, also
It is that is, distortion is the intrinsic defect of optical lens, and distortion can only reduce and can not be eliminated because the distortion that transillumination is caused,
Therefore by optical lens shoot come image all can exist distort, simply the problem of distortion degree size, for big visual angle
The distortion degree for the image border that lens shooting comes out is larger, and closer to centre, distortion is smaller, therefore second acquisition unit 402 is pressed
The image center pixel grid that first acquisition unit 401 wide-angle lens is shot is obtained according to pre-set dimension, and division unit 403 is by institute
State image be divided into the N number of pixel grid of center pixel size of mesh opening identical, wherein, N is integer more than or equal to 2,
Then correction unit 404 is using the center pixel grid as N number of pixel grid described in distortion correction N Reference Alignment, to obtain school
Positive image, and then can a certain degree of distortion for correcting the image that wide-angle lens is shot.
Fig. 5 is referred to, Fig. 5 is a kind of structural representation of mobile terminal 500 provided in an embodiment of the present invention, and the movement is whole
End includes：At least one input equipment 501；At least one output equipment 502；At least one processor 503, such as CPU；With deposit
Reservoir 504, the input equipment 501, output equipment 502, processor 503 and memory 504 are connected by bus 505.
Wherein, the contact panel of the input equipment 501 concretely mobile terminal, including touch-screen and touch screen, is used
Operational order in detection terminal touch panel.
The display screen of the output equipment 502 concretely mobile terminal, for exporting, display information.
The memory 504 can be high-speed RAM memory, or non-labile memory (non-volatile
Memory), such as magnetic disk storage.The memory 504 is used to store batch processing code, the input equipment 501, output
Equipment 502 and processor 503 are used to call the program code stored in memory 504, perform following operation：
The processor 503, for obtaining the image that the wide-angle lens of mobile terminal is shot；Obtained according to pre-set dimension
The center pixel grid of described image；Described image is divided into and the N number of pixel network of center pixel size of mesh opening identical
Lattice, wherein, N is the integer more than or equal to 2；N number of pixel described in distortion correction N Reference Alignment is used as using the center pixel grid
Grid, to obtain correction chart picture.
In some feasible embodiments, the processor 503 also particularly useful for：
N number of pixel grid is obtained to the lateral separation and fore-and-aft distance of the center pixel grid；
According to the lateral separation and fore-and-aft distance of N number of pixel grid to the center pixel grid, conversion and the N
The corresponding lateral aberration extent index of individual pixel grid and longitudinal distortion extent index；
According to corresponding with the N number of pixel grid lateral aberration extent index and longitudinal distortion extent index to institute
State N number of pixel grid and carry out distortion correction.
In some feasible embodiments, the processor 503 also particularly useful for：
It is abnormal according to default distortion model and the lateral aberration extent index corresponding with the N number of pixel grid and longitudinal direction
Become extent index, it is determined that lateral aberration correcting value corresponding with the N number of pixel grid and longitudinal distortion correcting value；
According to lateral aberration correcting value corresponding with the N number of pixel grid and longitudinal distortion correcting value to N number of pixel
Grid carries out distortion correction.
In some feasible embodiments, the processor 503 also particularly useful for：
Described image is subjected to gridding processing according to pre-set dimension, it is identical with the center pixel size of mesh opening to obtain
N number of pixel grid.
In some feasible embodiments, the central picture of described image is obtained according to pre-set dimension in the processor 503
Before plain grid, the processor 503 also particularly useful for：
Judge whether the distortion degree of described image is more than or equal to default distortion threshold value；
Wherein, the processor 503 in the distortion degree of described image specifically for being more than or equal to default distortion threshold value
In the case of, the center pixel grid of described image is obtained according to pre-set dimension.
In the specific implementation, the input equipment 501, output equipment 502 and processor 503 described in the embodiment of the present invention can
Implementation described in each embodiment for the bearing calibration for performing distortion provided in an embodiment of the present invention, also can perform this hair
The implementation of terminal described in the first embodiment for the mobile terminal that bright embodiment is provided, will not be repeated here.
Unit in all embodiments of the invention, can pass through universal integrated circuit, such as CPU (Central
Processing Unit, central processing unit), or pass through ASIC (Application Specific Integrated
Circuit, application specific integrated circuit) realize.
Step in present invention method can be sequentially adjusted, merged and deleted according to actual needs.
Module or unit in device of the embodiment of the present invention can be combined, divided and deleted according to actual needs.
One of ordinary skill in the art will appreciate that realize all or part of flow in above-described embodiment method, being can be with
The hardware of correlation is instructed to complete by computer program, described program can be stored in-computer read/write memory medium
In, the program is upon execution, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, described storage medium can be magnetic
Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access
Memory, RAM) etc..
Above disclosure is only preferred embodiment of present invention, can not limit the right model of the present invention with this certainly
Enclose, therefore the equivalent variations made according to the claims in the present invention, still belong to the scope that the present invention is covered.
Claims (10)
1. a kind of bearing calibration of distortion, it is characterised in that including：
Obtain the image that the wide-angle lens of mobile terminal is shot；
The center pixel grid of described image is obtained according to pre-set dimension；
By described image be divided into the N number of pixel grid of center pixel size of mesh opening identical, wherein, N be more than or equal to 2
Integer；
Using the center pixel grid as N number of pixel grid described in distortion correction N Reference Alignment, to obtain correction chart picture；
Wherein, it is described using the center pixel grid as N number of pixel grid described in distortion correction N Reference Alignment, including：
N number of pixel grid is obtained to the lateral separation and fore-and-aft distance of the center pixel grid；
According to the lateral separation and fore-and-aft distance of N number of pixel grid to the center pixel grid, conversion and N number of picture
The corresponding lateral aberration extent index of plain grid and longitudinal distortion extent index；
According to corresponding with the N number of pixel grid lateral aberration extent index and longitudinal distortion extent index to the N
Individual pixel grid carries out distortion correction.
2. bearing calibration according to claim 1, it is characterised in that with N number of pixel grid pair described in the basis
The lateral aberration extent index and longitudinal distortion extent index answered carry out distortion correction to N number of pixel grid, including：
According to distortion correction model and the lateral aberration extent index corresponding with the N number of pixel grid and longitudinal distortion journey
Parameter is spent, it is determined that lateral aberration correcting value corresponding with the N number of pixel grid and longitudinal distortion correcting value；
According to lateral aberration correcting value corresponding with the N number of pixel grid and longitudinal distortion correcting value to N number of pixel grid
Carry out distortion correction.
3. the bearing calibration according to any one of claim 1~2, it is characterised in that it is described by described image be divided into
The N number of pixel grid of center pixel size of mesh opening identical, including：
Described image is subjected to gridding processing according to pre-set dimension, to obtain and the center pixel size of mesh opening identical N
Individual pixel grid.
4. the bearing calibration according to any one of claim 1~2, it is characterised in that described to obtain institute according to pre-set dimension
Before the center pixel grid for stating image, the bearing calibration also includes：
Judge whether the distortion degree of described image is more than or equal to default distortion threshold value；
Wherein, the center pixel grid for obtaining described image according to pre-set dimension includes, in the distortion degree of described image
In the case of more than or equal to default distortion threshold value, the center pixel grid of described image is obtained according to pre-set dimension.
5. bearing calibration according to claim 3, it is characterised in that described to be obtained according to pre-set dimension in described image
Entreat before pixel grid, the bearing calibration also includes：
Judge whether the distortion degree of described image is more than or equal to default distortion threshold value；
Wherein, the center pixel grid for obtaining described image according to pre-set dimension includes, in the distortion degree of described image
In the case of more than or equal to default distortion threshold value, the center pixel grid of described image is obtained according to pre-set dimension.
6. a kind of mobile terminal, it is characterised in that including：
First acquisition unit, for obtaining the image that the wide-angle lens of mobile terminal is shot；
Second acquisition unit, the center pixel grid for obtaining described image according to pre-set dimension；
Division unit, the described image for the first acquisition unit to be got is divided into and the center pixel grid chi
The very little N number of pixel grid of identical, wherein, N is the integer more than or equal to 2；
Unit is corrected, the center pixel grid for being got using the second acquisition unit is used as distortion correction benchmark school
Just described N number of pixel grid, to obtain correction chart picture；
Wherein, it is described correction unit specifically for：
N number of pixel grid is obtained to the lateral separation and fore-and-aft distance of the center pixel grid；
According to the lateral separation and fore-and-aft distance of N number of pixel grid to the center pixel grid, conversion and N number of picture
The corresponding lateral aberration extent index of plain grid and longitudinal distortion extent index；
According to corresponding with the N number of pixel grid lateral aberration extent index and longitudinal distortion extent index to the N
Individual pixel grid carries out distortion correction.
7. mobile terminal according to claim 6, it is characterised in that the correction unit specifically for：
According to distortion correction model and the lateral aberration extent index corresponding with the N number of pixel grid and longitudinal distortion journey
Parameter is spent, it is determined that lateral aberration correcting value corresponding with the N number of pixel grid and longitudinal distortion correcting value；
According to lateral aberration correcting value corresponding with the N number of pixel grid and longitudinal distortion correcting value to N number of pixel grid
Carry out distortion correction.
8. the mobile terminal according to any one of claim 6~7, it is characterised in that the division unit specifically for：
Described image is subjected to gridding processing according to pre-set dimension, to obtain and the center pixel size of mesh opening identical N
Individual pixel grid.
9. the mobile terminal according to any one of claim 6~7, it is characterised in that the mobile terminal also includes：
Judging unit, for judging whether the distortion degree of described image is more than or equal to default distortion threshold value；
Wherein, the second acquisition unit specifically for：It is more than or equal to default distortion threshold value in the distortion degree of described image
In the case of, the center pixel grid of described image is obtained according to pre-set dimension.
10. mobile terminal according to claim 8, it is characterised in that
The mobile terminal also includes：
Judging unit, for judging whether the distortion degree of described image is more than or equal to default distortion threshold value；
Wherein, the second acquisition unit specifically for：It is more than or equal to default distortion threshold value in the distortion degree of described image
In the case of, the center pixel grid of described image is obtained according to pre-set dimension.
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| CN201510382676.6A CN105160632B (en) | 2015-06-30 | 2015-06-30 | A kind of distortion correction method and mobile terminal |
| CN201710880906.0A CN107657595B (en) | 2015-06-30 | 2015-06-30 | Distortion correction method, mobile terminal and related medium product |
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| CN105160632B (en) * | 2015-06-30 | 2017-11-07 | 广东欧珀移动通信有限公司 | A kind of distortion correction method and mobile terminal |
| CN106570826A (en) * | 2016-11-08 | 2017-04-19 | 山东省交通规划设计院 | Plane photo stitching correction ruler |
| CN107888899A (en) * | 2017-10-30 | 2018-04-06 | 杭州联络互动信息科技股份有限公司 | For image acquiring method, device and virtual reality device in virtual reality device |
| CN109754380B (en) * | 2019-01-02 | 2021-02-02 | 京东方科技集团股份有限公司 | Image processing method, image processing device and display device |
| CN110490820B (en) * | 2019-08-07 | 2022-04-12 | Oppo广东移动通信有限公司 | Image processing method and device, electronic equipment and storage medium |
| CN115209035A (en) * | 2021-04-14 | 2022-10-18 | Oppo广东移动通信有限公司 | Video-based distortion correction method and device, photographing equipment and storage medium |
| CN117111046B (en) * | 2023-10-25 | 2024-01-12 | 深圳市安思疆科技有限公司 | Distortion correction method, system, device and computer readable storage medium |
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