CN104994283B - A kind of bearing calibration of local distortion and mobile terminal - Google Patents

A kind of bearing calibration of local distortion and mobile terminal Download PDF

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Publication number
CN104994283B
CN104994283B CN201510381724.XA CN201510381724A CN104994283B CN 104994283 B CN104994283 B CN 104994283B CN 201510381724 A CN201510381724 A CN 201510381724A CN 104994283 B CN104994283 B CN 104994283B
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image
pixel grid
region
corrected
distortion
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CN104994283A (en
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李龙佳
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Abstract

The invention discloses a kind of bearing calibration of local distortion, this method also includes：Obtain the image of the wide-angle lens shooting of mobile terminal；The image-region to be corrected in described image is obtained, wherein, the distortion degree parameter of the image-region to be corrected is more than or equal to default distortion degree parameter；The center pixel grid of described image is obtained according to pre-set dimension；By the image-region to be corrected 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.The distortion of the image of wide-angle lens shooting a certain degree of can be corrected using the embodiment of the present invention.

Description

A kind of bearing calibration of local distortion and mobile terminal
Technical field
The present invention relates to bearing calibration and the mobile terminal of technical field of image processing, more particularly to a kind of local distortion.
Background technology
Due to the physical nonlinearity feature of camera lens, shape of material objects is inevitably caused to scheme in imaging process 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 reduce 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 increases relative to common lens distortion degree.
Therefore, work out it is a kind of wide-angle lens is shot after image enter the bearing calibration of line distortion and 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 local distortion, big for a certain degree of correction The distortion of the image of visual angle lens shooting.
First aspect present invention provides a kind of bearing calibration of local distortion, including：
Obtain the image of the wide-angle lens shooting of mobile terminal；
The image-region to be corrected in described image is obtained, wherein, the distortion degree of the image-region to be corrected Parameter is more than or equal to default distortion degree parameter；
The center pixel grid of described image is obtained according to pre-set dimension；
By the image-region to be corrected be divided into the N number of pixel grid of center pixel size of mesh opening identical, Wherein, N is the 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.
It is described to obtain the figure in the first possible implementation of first aspect with reference to first aspect present invention Image-region to be corrected as in, including：
Described image is parsed, to obtain the image-region that distortion degree parameter is more than or equal to default distortion degree parameter；
The distortion degree parameter is more than or equal to the image-region of default distortion degree parameter in the aobvious of mobile terminal Show and shown on interface, and prompt user to select image-region to be corrected；
If receiving the selection instruction of user's input, image-region to be corrected corresponding to the selection instruction is obtained, with Obtain the image-region to be corrected.
It is described to obtain the figure in the first possible implementation of first aspect with reference to first aspect present invention Image-region to be corrected as in, including：
Described image is parsed, is more than or equal to default distortion degree parameter to obtain distortion degree parameter in described image All image-regions, all image-regions are image-region to be corrected.
With reference to the first or second of possible implementation of first aspect present invention, first aspect, in first aspect The third possible implementation in, it is described that N number of picture described in distortion correction N Reference Alignment is used as using the center pixel grid Plain grid, including：
N number of pixel grid is obtained to the lateral separation and fore-and-aft distance of the center pixel grid；
Lateral separation and fore-and-aft distance according to N number of pixel grid to the center pixel grid, conversion and the N Lateral aberration extent index corresponding to individual pixel grid and longitudinal distortion degree；
Line distortion is entered to N number of pixel grid according to the distortion degree parameter corresponding with the N number of pixel grid Correction.
With reference to first aspect present invention, first aspect the first to the third possible implementation, in first aspect The 4th kind of possible implementation in, it is described described image is divided into it is N number of with the center pixel size of mesh opening identical Pixel grid, including：
The image-region to be corrected is subjected to gridding processing according to pre-set dimension, to obtain and the center pixel The N number of pixel grid of size of mesh opening identical.
Second aspect of the present invention provides a kind of mobile terminal, including：
First acquisition unit, the image that the wide-angle lens for obtaining mobile terminal is shot.
Second acquisition unit, the image to be corrected in the described image got for obtaining the first acquisition unit Region, wherein, the distortion degree parameter of the image-region to be corrected is more than or equal to default distortion degree parameter；
3rd acquiring unit, for getting the center of described image according to the pre-set dimension acquisition first acquisition unit Pixel grid；
Division unit, the image-region to be corrected for the second acquisition unit to be got is divided into and institute The N number of pixel grid of center pixel size of mesh opening identical is stated, wherein, N is the integer more than or equal to 2；
Unit is corrected, the center pixel grid for being got using the 3rd acquiring unit is used as distortion correction base Standard corrects 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, described second obtains list Member is specifically used for：
Described image is parsed, to obtain the image-region that distortion degree parameter is more than or equal to default distortion degree parameter；
The distortion degree parameter is more than or equal to the image-region of default distortion degree parameter in the aobvious of mobile terminal Show and shown on interface, and prompt user to select image-region to be corrected；
If receiving the selection instruction of user's input, image-region to be corrected corresponding to the selection instruction is obtained, with Obtain the image-region to be corrected.
With reference to second aspect of the present invention, in the first possible implementation of second aspect, described second obtains list Member is specifically used for：
Described image is parsed, is more than or equal to default distortion degree parameter to obtain distortion degree parameter in described image All image-regions, all image-regions are image-region to be corrected.
With reference to the first or second of possible implementation of second aspect of the present invention, second aspect, in second aspect The third possible implementation in, it is described correction unit be specifically used for：
N number of pixel grid is obtained to the lateral separation and fore-and-aft distance of the center pixel grid；
Lateral separation and fore-and-aft distance according to N number of pixel grid to the center pixel grid, conversion and the N Lateral aberration extent index corresponding to individual pixel grid and longitudinal distortion degree；
Line distortion is entered to N number of pixel grid according to the distortion degree parameter corresponding with the N number of pixel grid Correction.
With reference to second aspect of the present invention, second aspect the first to the third possible implementation, in second aspect The 4th kind of possible implementation in, by the image-region to be corrected according to pre-set dimension carry out gridding processing, with Obtain and the N number of pixel grid of center pixel size of mesh opening identical.
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 Because distortion caused by transillumination, i.e., distortion is the defects of optical lens is intrinsic, and distortion can only reduce and can not be eliminated, 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 close to middle image district The distortion in domain can be neglected, therefore the present invention first obtains the image of the wide-angle lens shooting of mobile terminal；Obtain the figure Image-region to be corrected as in, wherein, the distortion degree parameter of the image-region to be corrected, which is more than or equal to, to be preset Distortion degree parameter；The center pixel grid of described image is obtained according to pre-set dimension；The image-region to be corrected is drawn 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 described Pixel grid is entreated as N number of pixel grid described in distortion correction N Reference Alignment, to obtain correction chart picture, and then can be a certain degree of Correct the distortion of the image of wide-angle lens shooting.
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 required accompanying drawing used 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 local distortion provided in an embodiment of the present invention；
Fig. 2 is the second embodiment flow chart of the bearing calibration of local distortion provided in an embodiment of the present invention；
Fig. 3 is the 3rd embodiment flow chart of the bearing calibration of local 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 local distortion, big for a certain degree of correction The distortion of the image of visual angle 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, it should all belong to the model that the present invention protects 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 cover non-exclusive include.Such as 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 alternatively also including the step of not listing or list Member, or alternatively also include for the intrinsic other steps of these processes, method, product or equipment or unit.
One embodiment of the bearing calibration of local distortion of the present invention.Wherein, a kind of bearing calibration of local distortion：Obtain The image of the wide-angle lens shooting of mobile terminal；The image-region to be corrected in described image is obtained, wherein, it is described to treat school The distortion degree parameter of positive image-region is more than or equal to default distortion degree parameter；Described image is obtained according to pre-set dimension Center pixel grid；The image-region to be corrected is divided into and the N number of picture of center pixel size of mesh opening identical Plain grid, wherein, N is the integer more than or equal to 2；Using the center pixel grid as N number of described in distortion correction N Reference Alignment Pixel grid, to obtain correction chart picture.
Referring first to Fig. 1, Fig. 1 is a kind of first embodiment of the bearing calibration of local distortion provided in an embodiment of the present invention Flow chart.Wherein, as shown in figure 1, a kind of bearing calibration for local distortion that one embodiment of the present of invention provides can include Step S101~S105：
S101, obtain the image that the wide-angle lens of mobile terminal is shot.
In one embodiment, the image embodiment for obtaining the wide-angle lens shooting of mobile terminal can be mobile Terminal directly obtain the wide-angle lens shooting being stored in mobile terminal local image or mobile terminal from high in the clouds The image of wide-angle lens shooting 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, and object is shot to be clapped by above-mentioned big visual angle camera 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.
Image-region to be corrected in S102, acquisition described image, wherein, the distortion of the image-region to be corrected Extent index is more than or equal to default distortion degree parameter.
Wherein, the image-region to be corrected in described image can be that distortion degree parameter is more than or equal to default distortion A part or distortion degree parameter for extent index image-region is more than or equal to default distortion degree parametric image area The whole in domain.
In one embodiment, the embodiment of the image-region to be corrected in acquisition described image can be：Solution The image of the wide-angle lens shooting is analysed, to obtain the image district that distortion degree parameter is more than or equal to default distortion degree parameter Domain；The distortion degree parameter is more than or equal to display interface of the image-region in mobile terminal of default distortion degree parameter Upper displaying, and prompt user to select image-region to be corrected；If receiving the selection instruction of user's input, the selection is obtained Image-region to be corrected corresponding to instruction, to obtain the image-region to be corrected.
In another embodiment, the embodiment for obtaining the image-region to be corrected in described image can also It is：Described image is parsed to obtain all figures that distortion degree parameter in described image is more than or equal to default distortion degree parameter As region, all image-regions are image-region to be corrected.
S103, 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 obtains 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 more The cell of individual pixel composition；The cell that center pixel grid is pointed out for the centre of above-mentioned image.
S104, the image-region to be corrected is divided into and the N number of pixel of center pixel size of mesh opening identical Grid, wherein, N is the integer more than or equal to 2.
In the embodiment of the present invention, join due to being more than or equal to default distortion degree to the distortion degree parameter in above-mentioned image Several image-region carries out distortion correction, and is with center pixel grid benchmark the most, it is therefore desirable to distortion degree is more than or Equal to default distortion degree parameter image-region be divided into the above-mentioned multiple pixel grids of center pixel size of mesh opening identical, Wherein, presetting distortion journey parameter can be：0.2nd, 0.4,0.8,1,2 or other values.The image-region to be corrected is drawn Be divided into can be with the embodiment of the N number of pixel grid of center pixel size of mesh opening identical will be described to be corrected Image-region carries out gridding processing according to pre-set dimension, to obtain and the N number of pixel of center pixel size of mesh opening identical Grid.
S105, 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 S103 is got Benchmark, and N number of pixel grid that above-mentioned steps S104 is got is corrected according to default aberration correction algorithm, Ran Houyi Dynamic terminal is integrated N number of pixel grid after correction and center pixel grid 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 described in distortion correction N Reference Alignment is used as using the center pixel grid Embodiment can be：N number of pixel grid is obtained to the lateral separation and fore-and-aft distance of the center pixel grid； Lateral separation and fore-and-aft distance according to N number of pixel grid to the center pixel grid, conversion and N number of pixel network Lateral aberration extent index corresponding to lattice and longitudinal distortion degree；According to the journey that distorts corresponding with N number of pixel grid Spend parameter and distortion correction is carried out to N number of pixel grid.
In another embodiment, according to the distortion degree parameter corresponding with the N number of pixel grid to described N number of The embodiment that pixel grid carries out distortion correction can be according to default distortion model and described and N number of pixel network Lateral aberration extent index corresponding to lattice and longitudinal distortion extent index, it is determined that lateral aberration corresponding with the N number of pixel grid Correcting value and longitudinal distortion correcting value；Corrected according to lateral aberration correcting value corresponding with the N number of pixel grid and longitudinal distortion Amount carries 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 Because distortion caused by transillumination, i.e., distortion is the defects of optical lens is intrinsic, and distortion can only reduce and can not be eliminated, 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 close to middle image district The distortion in domain can be neglected, therefore the present invention first obtains the image of the wide-angle lens shooting of mobile terminal；Obtain the figure Image-region to be corrected as in, wherein, the distortion degree parameter of the image-region to be corrected, which is more than or equal to, to be preset Distortion degree parameter；The center pixel grid of described image is obtained according to pre-set dimension；The image-region to be corrected is drawn 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 described Pixel grid is entreated as N number of pixel grid described in distortion correction N Reference Alignment, to obtain correction chart picture, and then can be a certain degree of Correct the distortion of the image of wide-angle lens shooting.
Fig. 2 is referred to, Fig. 2 is a kind of second embodiment stream of the bearing calibration of local distortion provided in an embodiment of the present invention Cheng Tu.Wherein, as shown in Fig. 2 a kind of bearing calibration for local distortion that one embodiment of the present of invention provides can include step Rapid S201~S209：
S201, obtain the image that the wide-angle lens of mobile terminal is shot.
In one embodiment, the image embodiment for obtaining the wide-angle lens shooting of mobile terminal can be mobile Terminal directly obtain the wide-angle lens shooting being stored in mobile terminal local image or mobile terminal from high in the clouds The image of wide-angle lens shooting 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, and object is shot to be clapped by above-mentioned big visual angle camera 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, parsing described image, to obtain the image that distortion degree parameter is more than or equal to default distortion degree parameter Region.
S203, the distortion degree parameter is more than or equal to the image-region of default distortion degree parameter in mobile terminal Display interface on show, and prompt user to select image-region to be corrected.
If S204, the selection instruction for receiving user's input, obtain image district to be corrected corresponding to the selection instruction Domain, to obtain the image-region to be corrected.
Specifically, above-mentioned image is substituted into model set in advance, distortion degree parameter is can obtain more than or equal to default The image-region of distortion degree parameter；The distortion degree parameter got is more than or equal to default distortion degree by mobile terminal joins Several image-regions is shown by the form of piecemeal on the display interface of mobile terminal, so that user checks；And prompt user Image-region to be corrected is selected, prompting mode can be that school is treated in displaying prompting user's selection on the display interface of mobile terminal The prompt message of positive image-region or image-region to be corrected is selected by voice message user, equally also may be used To be that other modes prompting user selects image-region to be corrected；If mobile terminal receives the selection instruction of user's input, Then image-region to be corrected corresponding to selection instruction described in acquisition for mobile terminal, need to correct so as to obtain this distortion correction Image-region.
S205, the center pixel grid according to pre-set dimension acquisition described image.
S206, by the image-region to be corrected according to pre-set dimension carry out gridding processing, with obtain with it is described in Entreat the N number of pixel grid of pixel grid size identical.
S207, N number of pixel grid is obtained to the lateral separation and fore-and-aft distance of the center pixel grid.
S208, lateral separation and fore-and-aft distance according to N number of pixel grid to the center pixel grid, conversion with Lateral aberration extent index and longitudinal distortion degree corresponding to N number of pixel grid.
S209, according to the distortion degree parameter corresponding with the N number of pixel grid to N number of pixel grid progress 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 shooting image center pixel grid；Then mobile terminal gets above-mentioned steps S204 to be corrected Image-region carries out gridding processing according to 100*100 pixels, to obtain and the above-mentioned N number of picture of center pixel size of mesh opening identical Plain grid；Then mobile terminal point centered on above-mentioned center pixel grid, obtains the two-dimensional coordinate of N number of pixel grid, i.e., N number of Lateral separation and fore-and-aft distance of the pixel grid to center pixel grid；Mobile terminal is joined according to default distance and distortion degree Several ratios and above-mentioned N number of pixel grid to the center pixel grid lateral separation and fore-and-aft distance, conversion with it is above-mentioned N number of Lateral aberration extent index corresponding to pixel grid and longitudinal distortion extent index；Mobile terminal is by above-mentioned N number of pixel grid pair The lateral aberration extent index and longitudinal distortion extent index answered substitute into distortion correction model set in advance, with determine with it is above-mentioned N number of pixel grid corresponds to lateral aberration correcting value and longitudinal distortion correcting value；Last mobile terminal is by N number of pixel grid of determination Corresponding lateral aberration correcting value and longitudinal distortion correcting value substitute into default distortion algorithm (such as net template slicing algorithm) with Reach the above-mentioned N number of pixel grid of correction, then integrated N number of pixel grid after correction and center pixel grid to obtain Image after correction.
Wherein, what above-mentioned distortion degree parameter represented is amount of the current location relative to the distortion degree of 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 fault image coordinate and correct the mapping relations between image coordinate, the difference between 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 Because distortion caused by transillumination, i.e., distortion is the defects of optical lens is intrinsic, and distortion can only reduce and can not be eliminated, 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 close to middle image district The distortion in domain can be neglected, therefore the present invention first obtains the image of the wide-angle lens shooting of mobile terminal；Obtain the figure Image-region to be corrected as in, wherein, the distortion degree parameter of the image-region to be corrected, which is more than or equal to, to be preset Distortion degree parameter；The center pixel grid of described image is obtained according to pre-set dimension；The image-region to be corrected is drawn 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；Obtain the N Lateral separation and fore-and-aft distance of the individual pixel grid to the center pixel grid；According to N number of pixel grid in described Entreat the lateral separation and fore-and-aft distance of pixel grid, conversion lateral aberration extent index corresponding with the N number of pixel grid and Longitudinal distortion degree；N number of pixel grid is carried out according to the distortion degree parameter corresponding with the N number of pixel grid Distortion correction, to obtain correction chart picture, and then it a certain degree of can correct the distortion of the image of wide-angle lens shooting.
Fig. 3 is referred to, Fig. 3 is a kind of 3rd embodiment stream of the bearing calibration of local distortion provided in an embodiment of the present invention Cheng Tu.Wherein, as shown in figure 3, a kind of bearing calibration for local distortion that one embodiment of the present of invention provides can include step Rapid S301~S307：
S301, obtain the image that the wide-angle lens of mobile terminal is shot.
In one embodiment, the image embodiment for obtaining the wide-angle lens shooting of mobile terminal can be mobile Terminal directly obtain the wide-angle lens shooting being stored in mobile terminal local image or mobile terminal from high in the clouds The image of wide-angle lens shooting 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, and object is shot to be clapped by above-mentioned big visual angle camera 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, parsing described image, it is more than or equal to default distortion degree to obtain distortion degree parameter in described image All image-regions of parameter, all image-regions are image-region to be corrected.
S303, the center pixel grid according to pre-set dimension acquisition described image.
S304, by the image-region to be corrected according to pre-set dimension carry out gridding processing, with obtain with it is described in Entreat the N number of pixel grid of pixel grid size identical.
S305, N number of pixel grid is obtained to the lateral separation and fore-and-aft distance of the center pixel grid.
S306, lateral separation and fore-and-aft distance according to N number of pixel grid to the center pixel grid, conversion with Lateral aberration extent index and longitudinal distortion degree corresponding to N number of pixel grid.
S307, according to the distortion degree parameter corresponding with the N number of pixel grid to N number of pixel grid progress Distortion correction.
Specifically, mobile terminal first obtains above-mentioned steps S301 according to pre-set dimension (such as 100*100 pixels) and got Wide-angle lens shooting image center pixel grid；Then the figure that mobile terminal gets above-mentioned steps S302 Distortion degree parameter carries out net more than or equal to all image-regions of default distortion degree parameter according to 100*100 pixels as in Format processing, to obtain and the above-mentioned N number of pixel grid of center pixel size of mesh opening identical；Then mobile terminal is with above-mentioned center Point centered on pixel grid, obtain the two-dimensional coordinate of N number of pixel grid, i.e., the transverse direction of N number of pixel grid to center pixel grid Distance and fore-and-aft distance；Mobile terminal arrives according to the ratio and above-mentioned N number of pixel grid of default distance and distortion degree parameter The lateral separation and fore-and-aft distance of the center pixel grid, conversion lateral aberration degree corresponding with above-mentioned N number of pixel grid Parameter and longitudinal distortion extent index；Mobile terminal is by lateral aberration extent index and longitudinal direction corresponding to above-mentioned N number of pixel grid Distortion degree parameter substitutes into distortion correction model set in advance, to determine lateral aberration school corresponding with above-mentioned N number of pixel grid Positive quantity and longitudinal distortion correcting value；N number of pixel grid of determination is corresponded to lateral aberration correcting value and longitudinal direction by last mobile terminal Distortion correction amount substitutes into default distortion algorithm (such as net template slicing algorithm) to reach the above-mentioned N number of pixel grid of correction, Then N number of pixel grid after correction and center pixel grid is 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 Because distortion caused by transillumination, i.e., distortion is the defects of optical lens is intrinsic, and distortion can only reduce and can not be eliminated, 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 close to middle image district The distortion in domain can be neglected, therefore the present invention first obtains the image of the wide-angle lens shooting of mobile terminal；Obtain the figure Distortion degree parameter is more than or equal to all image-regions of default distortion degree parameter as in, and all image-regions are to treat Correct image-region；The center pixel grid of described image is obtained according to pre-set dimension；The image-region to be corrected is drawn 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；Obtain the N Lateral separation and fore-and-aft distance of the individual pixel grid to the center pixel grid；According to N number of pixel grid in described Entreat the lateral separation and fore-and-aft distance of pixel grid, conversion lateral aberration extent index corresponding with the N number of pixel grid and Longitudinal distortion degree；N number of pixel grid is carried out according to the distortion degree parameter corresponding with the N number of pixel grid Distortion correction, to obtain correction chart picture, and then it a certain degree of can correct the distortion of the image of wide-angle lens shooting.
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, the image that the wide-angle lens for obtaining mobile terminal is shot.
Second acquisition unit 402, it is to be corrected in the described image got for obtaining the first acquisition unit Image-region, wherein, the distortion degree parameter of the image-region to be corrected is more than or equal to default distortion degree parameter.
3rd acquiring unit 403, described image is got for obtaining the first acquisition unit according to pre-set dimension Center pixel grid.
Division unit 404, the image-region to be corrected for the second acquisition unit to be got are divided into 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.
Unit 405 is corrected, for being used as distortion school using the center pixel grid that the 3rd acquiring unit is got N number of pixel grid described in positive N Reference Alignment, to obtain correction chart picture.
Wherein, above-mentioned second acquisition unit 402 is specifically used for：
Described image is parsed, to obtain the image-region that distortion degree parameter is more than or equal to default distortion degree parameter；
The distortion degree parameter is more than or equal to the image-region of default distortion degree parameter in the aobvious of mobile terminal Show and shown on interface, and prompt user to select image-region to be corrected；
If receiving the selection instruction of user's input, image-region to be corrected corresponding to the selection instruction is obtained, with Obtain the image-region to be corrected.
Wherein, above-mentioned second acquisition unit 402 is specifically used for：
Described image is parsed, is more than or equal to default distortion degree parameter to obtain distortion degree parameter in described image All image-regions, all image-regions are image-region to be corrected.
Wherein, above-mentioned correction unit 405 is specifically used for：
N number of pixel grid is obtained to the lateral separation and fore-and-aft distance of the center pixel grid；
Lateral separation and fore-and-aft distance according to N number of pixel grid to the center pixel grid, conversion and the N Lateral aberration extent index corresponding to individual pixel grid and longitudinal distortion degree；
Line distortion is entered to N number of pixel grid according to the distortion degree parameter corresponding with the N number of pixel grid Correction.
Wherein, above-mentioned division unit 404 is specifically used for：
The image-region to be corrected is subjected to gridding processing according to pre-set dimension, to obtain and the center pixel The N number of pixel grid of size of mesh opening identical.
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 specific implementation in example is applied, its specific implementation process is referred to the associated description of 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 Because distortion caused by transillumination, i.e., distortion is the defects of optical lens is intrinsic, and distortion can only reduce and can not be eliminated, 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 close to middle image district The distortion in domain can be neglected, therefore first acquisition unit of the present invention 401 first obtains the wide-angle lens shooting of mobile terminal Image；Second acquisition unit 402 obtains the image-region to be corrected in described image, wherein, the image district to be corrected The distortion degree parameter in domain is more than or equal to default distortion degree parameter；3rd acquiring unit 403 obtains institute according to pre-set dimension State the center pixel grid of image；The image-region to be corrected is divided into and the center pixel net by division unit 404 The N number of pixel grid of lattice size identical, wherein, N is the integer more than or equal to 2；Unit 405 is corrected with the center pixel grid As N number of pixel grid described in distortion correction N Reference Alignment, to obtain correction chart picture, and then a certain degree of big visual angle can be corrected The distortion of the image of lens shooting.
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, use Operational order on detection terminal contact 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 ), such as magnetic disk storage memory.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：
Above-mentioned processing 503, the image that the wide-angle lens for obtaining mobile terminal is shot；
The image-region to be corrected in described image is obtained, wherein, the distortion degree of the image-region to be corrected Parameter is more than or equal to default distortion degree parameter；
The center pixel grid of described image is obtained according to pre-set dimension；
By the image-region to be corrected be divided into the N number of pixel grid of center pixel size of mesh opening identical, Wherein, N is the 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.
In some feasible embodiments, above-mentioned processing 503 also particularly useful for：
Described image is parsed, to obtain the image-region that distortion degree parameter is more than or equal to default distortion degree parameter；
The distortion degree parameter is more than or equal to the image-region of default distortion degree parameter in the aobvious of mobile terminal Show and shown on interface, and prompt user to select image-region to be corrected；
If receiving the selection instruction of user's input, image-region to be corrected corresponding to the selection instruction is obtained, with Obtain the image-region to be corrected.
In some feasible embodiments, above-mentioned processing 503 also particularly useful for：
Described image is parsed, is more than or equal to default distortion degree parameter to obtain distortion degree parameter in described image All image-regions, all image-regions are image-region to be corrected.
In some feasible embodiments, above-mentioned processing 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；
Lateral separation and fore-and-aft distance according to N number of pixel grid to the center pixel grid, conversion and the N Lateral aberration extent index corresponding to individual pixel grid and longitudinal distortion degree；
Line distortion is entered to N number of pixel grid according to the distortion degree parameter corresponding with the N number of pixel grid Correction.
In some feasible embodiments, above-mentioned processing 503 also particularly useful for：
The image-region to be corrected is subjected to gridding processing according to pre-set dimension, to obtain and the center pixel The N number of pixel grid of size of mesh opening identical.
In the specific implementation, the input equipment 501, output equipment 502 and processor 503 described in the embodiment of the present invention can The implementation described in each embodiment of the bearing calibration of local distortion provided in an embodiment of the present invention is performed, also can perform The implementation of terminal described in the first embodiment of mobile terminal provided in an embodiment of the present invention, will not be repeated here.
Unit in all embodiments of the invention, universal integrated circuit, such as CPU (Central can be passed through 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 (9)

  1. A kind of 1. bearing calibration of local distortion, it is characterised in that including：
    Obtain the image of the wide-angle lens shooting of mobile terminal；
    The image-region to be corrected in described image is obtained, wherein, the distortion degree parameter of the image-region to be corrected More than or equal to default distortion degree parameter；
    The center pixel grid of described image is obtained according to pre-set dimension；
    By the image-region to be corrected be divided into the N number of pixel grid of center pixel size of mesh opening identical, wherein, N is the 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；
    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；
    Lateral separation and fore-and-aft distance according to N number of pixel grid to the center pixel grid, conversion and N number of picture Lateral aberration extent index corresponding to plain grid and longitudinal distortion degree；
    Distortion correction is carried out to N number of pixel grid according to the distortion degree parameter corresponding with the N number of pixel grid.
  2. 2. bearing calibration according to claim 1, it is characterised in that the image to be corrected obtained in described image Region, including：
    Described image is parsed, to obtain the image-region that distortion degree parameter is more than or equal to default distortion degree parameter；
    The distortion degree parameter is more than or equal to display circle of the image-region in mobile terminal of default distortion degree parameter Shown on face, and prompt user to select image-region to be corrected；
    If receiving the selection instruction of user's input, image-region to be corrected corresponding to the selection instruction is obtained, to obtain The image-region to be corrected.
  3. 3. bearing calibration according to claim 1, it is characterised in that the image to be corrected obtained in described image Region, including：
    Described image is parsed, is more than or equal to all of default distortion degree parameter to obtain distortion degree parameter in described image Image-region, all image-regions are image-region to be corrected.
  4. 4. according to the bearing calibration described in any one of claims 1 to 3, it is characterised in that described by the image to be corrected Region division be with the N number of pixel grid of center pixel size of mesh opening identical, including：
    The image-region to be corrected is subjected to gridding processing according to pre-set dimension, to obtain and the center pixel grid The N number of pixel grid of size identical.
  5. A kind of 5. mobile terminal, it is characterised in that including：
    First acquisition unit, the image that the wide-angle lens for obtaining mobile terminal is shot；
    Second acquisition unit, the image district to be corrected in the described image got for obtaining the first acquisition unit Domain, wherein, the distortion degree parameter of the image-region to be corrected is more than or equal to default distortion degree parameter；
    3rd acquiring unit, for getting the center pixel of described image according to the pre-set dimension acquisition first acquisition unit Grid；
    Division unit, the image-region to be corrected for the second acquisition unit to be got be divided into it is described in The N number of pixel grid of pixel grid size identical is entreated, wherein, N is the integer more than or equal to 2；
    Unit is corrected, for being used as distortion correction benchmark school using the center pixel grid that the 3rd acquiring unit is got Just described N number of pixel grid, to obtain correction chart picture；
    Wherein, the correction unit is specifically used for：
    N number of pixel grid is obtained to the lateral separation and fore-and-aft distance of the center pixel grid；
    Lateral separation and fore-and-aft distance according to N number of pixel grid to the center pixel grid, conversion and N number of picture Lateral aberration extent index corresponding to plain grid and longitudinal distortion degree；
    Distortion correction is carried out to N number of pixel grid according to the distortion degree parameter corresponding with the N number of pixel grid.
  6. 6. mobile terminal according to claim 5, it is characterised in that the second acquisition unit is specifically used for：
    Described image is parsed, to obtain the image-region that distortion degree parameter is more than or equal to default distortion degree parameter；
    The distortion degree parameter is more than or equal to display circle of the image-region in mobile terminal of default distortion degree parameter Shown on face, and prompt user to select image-region to be corrected；
    If receiving the selection instruction of user's input, image-region to be corrected corresponding to the selection instruction is obtained, to obtain The image-region to be corrected.
  7. 7. mobile terminal according to claim 5, it is characterised in that the second acquisition unit is specifically used for：
    Parsing described image is more than or equal to all of default distortion degree parameter to obtain distortion degree parameter in described image Image-region, all image-regions are image-region to be corrected.
  8. 8. according to the mobile terminal described in any one of claim 5~7, it is characterised in that the division unit is specifically used for：
    The image-region to be corrected is subjected to gridding processing according to pre-set dimension, to obtain and the center pixel grid The N number of pixel grid of size identical.
  9. 9. a kind of computer-readable recording medium, it is characterised in that the computer-readable recording medium storage has computer journey Sequence, the computer program include the instruction for being used for the method at least described in any one of Claims 1-4.
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