CN105430376B - A kind of detection method and device of panorama camera uniformity - Google Patents
A kind of detection method and device of panorama camera uniformity Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/002—Diagnosis, testing or measuring for television systems or their details for television cameras
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/698—Control of cameras or camera modules for achieving an enlarged field of view, e.g. panoramic image capture
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Abstract
The invention discloses a kind of detection method and device of panorama camera uniformity, for panorama camera technical field.Method includes：The video of panorama camera shooting is carried out taking out frame, video is placed in equivalent brightness, video captured in the environment of equivalent marker for each camera of panorama camera；Obtain and take out the average gray of the video image that frame obtains, it is respectively that each average gray of acquisition gray scale reference point work corresponding with the average gray is poor, will be all poor and as brightness uniformity index parameter；Obtain the color value for taking out the marker in the video image that frame obtains captured by each camera, calculate the mean square deviation of the color value color reference point corresponding with the color value captured by each camera of acquisition respectively, using all mean square deviations and as colour consistency index parameter.The present invention can effectively assess panorama camera uniformity effect in terms of brightness and color, can quantify.
Description
Technical field
The present invention relates to panorama camera technical field, and in particular to a kind of detection method and dress of panorama camera uniformity
Put.
Background technology
At present, panorama camera progressively starts to popularize, wherein most crucial is exactly that multi-channel video splices in real time.Panorama phase
Machine has at least two camera, when the environment that each camera is seen is different, because camera is in itself to light
According to color existing for difference, along with the difference between the stitching algorithm compensated to brightness and color, finally result in
The problem of brightness and inconsistent color be present in the panoramic video of output.Even if the environment that each camera is seen is the same, it is exported
Panoramic video can also have the problem of brightness and inconsistent color.
Brightness to panorama camera at present and the evaluation of consistency of colour effect, using the side directly to detect by an unaided eye
Method, this determination methods by subjective consciousness can not quantify.It can be seen that lack a kind of panorama camera of assessing at present in brightness and color
The technology of aspect uniformity effect.
The content of the invention
The embodiment of the present invention provides a kind of detection method and device of panorama camera uniformity, to provide a kind of assessment panorama
Camera uniformity effect in terms of brightness and color.
First aspect present invention provides a kind of detection method of panorama camera uniformity, the panorama camera have two with
On camera, methods described includes：
The video of panorama camera shooting is carried out taking out frame, the video is placed in for each camera of panorama camera
Equivalent brightness, video captured in the environment of equivalent marker；
The average gray for taking out the video image that frame obtains is obtained, respectively by each average gray of acquisition and the ash
Spend gray scale reference point corresponding to average value make it is poor, will be all poor and as brightness uniformity index parameter；
The color value for taking out the marker in the video image that frame obtains captured by each camera is obtained, is counted respectively
The mean square deviation of the color value color reference point corresponding with the color value captured by each camera obtained is calculated, will be all equal
Variance and be used as colour consistency index parameter.
Second aspect of the present invention provides a kind of detection means of panorama camera uniformity, the panorama camera have two with
On camera, described device includes：
Frame module is taken out, the video for being shot to the panorama camera carries out taking out frame, and the video is every for panorama camera
One camera is placed in equivalent brightness, video captured in the environment of equivalent marker；
First acquisition module, the average gray for the video image that frame obtains is taken out for obtaining, respectively by each of acquisition
It is poor that corresponding with the average gray gray scale reference point of individual average gray is made, will be all poor and as brightness uniformity index
Parameter；
Second acquisition module, standard reference in the video image that frame obtains captured by each camera is taken out for obtaining
The color value of thing, the color value color reference point corresponding with the color value captured by each camera of acquisition is calculated respectively
Mean square deviation, using all mean square deviations and as colour consistency index parameter.
Therefore the embodiment of the present invention is by taking out frame to video, calculating average gray and color value, and make respectively it is poor
With seek mean square deviation, brightness uniformity index parameter and colour consistency index parameter can be finally provided, it is complete from can effectively assess
Scape camera uniformity effect in terms of brightness and color, can quantify.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, below will be to institute in embodiment and description of the prior art
The accompanying drawing needed to use is briefly described, it should be apparent that, drawings in the following description are only some implementations of the present invention
Example, for those of ordinary skill in the art, on the premise of not paying creative work, can also be obtained according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is the flow chart of the detection method of panorama camera uniformity provided in an embodiment of the present invention；
Fig. 2 is one that the detection method Plays luminous source lamp box of panorama camera uniformity provided in an embodiment of the present invention is placed
Individual exemplary plot；
Fig. 3 is the one of the straight line fitted in the detection method of panorama camera uniformity provided in an embodiment of the present invention
Individual exemplary plot；
Fig. 4 is the one of the 24 colour chart pictures extracted in the detection method of panorama camera uniformity provided in an embodiment of the present invention
Individual exemplary plot；
Fig. 5 is the logical construction schematic diagram of the detection means of panorama camera uniformity provided in an embodiment of the present invention.
Embodiment
The embodiment of the present invention provides a kind of detection method of panorama camera uniformity, to assess panorama camera in brightness and face
Uniformity effect in terms of color.The embodiment of the present invention also provides a kind of corresponding detection means of panorama camera uniformity.
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.
Below by specific embodiment, it is described in detail respectively.
It refer to Fig. 1, a kind of detection method of panorama camera uniformity provided in an embodiment of the present invention, it may include：
110th, the video of panorama camera shooting is carried out taking out frame, the video is each camera of panorama camera
It is placed in equivalent brightness, video captured in the environment of equivalent marker.
In some embodiments of the invention, also include before step 110：
The standard light source lamp house being equal with the camera quantity identical and equivalent marker are distinguished in advance
Before being placed in the camera.
The video to panorama camera shooting, which carries out taking out frame, to be included：
More than two sections of video of panorama camera shooting is carried out taking out frame, wherein, with quasi-optical under section video capture
The brightness degree of source lamp box is identical, and the brightness degree of the quasi- luminous source lamp box under different section video captures is different.
In some embodiments of the invention, the standard light source lamp house is briliancy case.
Because panorama camera typically has at least two camera, it is assumed that the panorama camera for needing to determine has N number of
Camera, wherein, N is the natural number more than 2.During the step 120 stated after execution, it is preferred that N number of standard sources lamp can be used
Case, Fig. 2 is refer to, Fig. 2 employs four standard light source lamp houses 10, faces the center of each camera 11 respectively, it is preferred that
Standard light source lamp house 10 can specifically use briliancy case, and the briliancy case, which is provided with one piece, can send equal white light, brightness degree
Adjustable panel.
In some embodiments of the invention, the camera of the panorama camera is evenly distributed on a ball, is each taken the photograph
As the center of head faces a briliancy case.All gray scale casees are the same briliancy casees, i.e., equivalent briliancy case, each
One object of reference is housed, all objects of reference are that striking resemblances are equivalent object of reference on briliancy case.So as to make the panorama
The camera of camera is in an environment that brightness is equivalent, object of reference is equivalent.
During the step 120 stated after execution, it is preferred that can be by panorama camera and the N number of standard being aligned with each camera
Luminous source lamp box is positioned in a black room together, and after the brightness degree for adjusting all briliancy casees is 1, one is shot using panorama camera
Section video, after the brightness degree for adjusting all briliancy casees is 2, panorama camera is recycled to shoot one section of video, that is to say, that same to section
The brightness degree of briliancy case under video capture is identical, and the brightness degree of the briliancy case under different section video captures is different.Work as ash
Degree case is when having multiple brightness degrees, and grade that can be optionally more than 2 therein shoots video.Preferably, when gray scale case
When brightness degree has K, wherein K is natural number, then the video of panorama camera shooting is K section videos, the embodiment of the present invention
In, it is described to the panorama camera shooting video carry out taking out frame the step of be specially to the panorama camera shooting K sections regard
Frequency carries out taking out frame.The video hop count of shooting is more, and the result of calculation of later-mentioned step 120 is more accurate.
120th, obtain and take out the average gray of the video image that frame obtains, respectively by each average gray of acquisition with
It is poor that gray scale reference point corresponding to the average gray is made, will be all poor and as brightness uniformity index parameter.
In some embodiments of the invention, it is described to obtain the average gray for taking out the video image that frame obtains, respectively will
Each average gray corresponding with the average gray gray scale reference point work obtained is poor, will be all poor and as brightness
Coincident indicator parameter includes：
Acquisition takes out frame and obtains the average gray of each video image, according to the brightness degree and the average gray
Draw the gray average discrete point of two dimension；
Using least square method, straight line is fitted according to the gray average discrete point；
Calculate the distance of all gray average discrete points and the straight line；
Will calculate gained it is all apart from sum as brightness uniformity index parameter.
For ease of being better understood from technical scheme provided in an embodiment of the present invention, it is illustrated below：
Because brightness degree is linear, exemplified by shooting 6 sections of videos, abovementioned steps 110 can be to the 6 of panorama camera shooting
Section video carries out taking out respectively frame, and step 120 specifically can seek an average gray by counting the grey level histogram of each frame,
That is each section of video has a gray average, finally according to brightness degree and average gray draw one it is two-dimentional
Gray average discrete point is come out, and using the method for least square, straight line is fitted according to the gray average discrete point drawn
Out, all gray averages are obtained to fitting a straight line apart from sum, this apart from sum be exactly panorama camera brightness it is consistent
Property index parameter.Fig. 3 is refer to, for an example of the straight line fitted.When bigger apart from sum, the brightness is consistent
Property index parameter is bigger, and the brightness uniformity of panorama camera is poorer, when smaller apart from sum, the brightness uniformity index
For parameter with regard to smaller, the brightness uniformity of panorama camera is better, and under ideal conditions, all gray averages point should be located at fitting
Straight line on.
130th, the color value for taking out the marker in the video image that frame obtains captured by each camera is obtained, point
The mean square deviation of the color value color reference point corresponding with the color value captured by each camera of acquisition is not calculated, by institute
Have mean square deviation and it is used as colour consistency index parameter.
When all mean square deviations and it is bigger when, illustrate that the colour consistency of panorama camera is poorer, when all mean square deviations
More hour, illustrate the colour consistency of panorama camera with regard to smaller.
In some embodiments of the invention, it is preferred that the object of reference is colour atla, and the colour atla includes 24 kinds of colors.
In a particular application, any equivalent object of reference can also be used, is not intended to limit the invention.
For ease of being better understood from technical scheme provided in an embodiment of the present invention, it is introduced below by an example.
In black room, first panorama camera is positioned in light box, each camera of panorama camera faces one
Individual standard light source lamp house, 24 colour atlas of standard are posted on four perisporiums of standard light source lamp house, to ensure that each camera can be seen
One complete 24 colour atla, using under D65 standard sources illumination, one section of video is recorded, in the video image that frame obtains is taken out
Including 24 colour chart pictures captured by each camera, each 24 colour chart picture can be first extracted from video image as shown in figure 4,
Then 24 kinds of color values in 24 regions in each 24 colour chart picture are obtained, due to colour atla under standard sources color reference point
It is known to fixation, finally by the color value color corresponding with the color value calculated captured by each camera of acquisition
The mean square deviation of reference point, using all mean square deviations and as colour consistency index parameter.
Assuming that having N number of camera against the colour atla of N blocks 24, each piece of 24 colour atlas have 24 kinds of colors, and the color of N blocks 24 is had in panorama sketch
Card region, it is assumed that only four cameras, then 4 piece of 24 colour atla region, a kind of face of each piece of 24 colour atlas are had in panorama sketch
Color region, a red channel average, green channel average, blue channel average, three averages compositions one can be calculated
Vector represents the color value of this part color region, and each piece of 24 colour atlas have 24 vectors, and color reference point is also to have 24
Vector, 24 vectors of 24 vectors of four piece of 24 colour atla respectively with the color reference point of standard seek mean square deviation, and obtained value is just
It is the error for the color reference point that this block colour atla deviates standard, four 24 colour atla mean square deviations additions are exactly the color one of panorama camera
Cause property index parameter.
Therefore in some feasible embodiments of the present invention, by taking out frame to video, calculating average gray
And color value, and make difference respectively and seek mean square deviation, brightness uniformity index parameter and colour consistency index ginseng can be finally provided
Number, from can effectively assess panorama camera uniformity effect in terms of brightness and color, can quantify.
In order to preferably implement the such scheme of the embodiment of the present invention, it is also provided below and implements such scheme for coordinating
Relevant apparatus.
Fig. 5 is refer to, the embodiment of the present invention provides a kind of detection means 50 of panorama camera uniformity, the panorama camera
With more than two cameras, described device may include：
Frame module 510 is taken out, the video for being shot to the panorama camera carries out taking out frame, and the video is panorama camera
Each camera is placed in equivalent brightness, video captured in the environment of equivalent marker；
First acquisition module 520, the average gray for the video image that frame obtains is taken out for obtaining, respectively by the every of acquisition
It is poor that corresponding with the average gray gray scale reference point of one average gray is made, will be all poor and refer to as brightness uniformity
Mark parameter；
Second acquisition module 530, for obtaining the standard in the video image that frame obtains captured by each camera of taking out
The color value of object of reference, the color value color ginseng corresponding with the color value captured by each camera of acquisition is calculated respectively
According to the mean square deviation of value, using all mean square deviations and as colour consistency index parameter.
In some embodiments of the invention, described device also includes：
The standard light source lamp house and equivalent marker being equal with the camera quantity identical, for dividing in advance
Before not being placed in the camera；
First acquisition module 520, specifically for being taken out to more than two sections of the video that the panorama camera is shot
Frame, it is poor respectively to make each average gray of acquisition gray scale reference point corresponding with the average gray, will be all poor
With as brightness uniformity index parameter, wherein, different sections identical with the brightness degree of the quasi- luminous source lamp box under section video capture
The brightness degree of quasi- luminous source lamp box under video capture is different.
In some embodiments of the invention, first acquisition module 520 includes：
Acquiring unit, take out frame for obtaining and obtain the average gray of each video image, according to the brightness degree with
The average gray draws the gray average discrete point of two dimension；
Fitting a straight line unit, for using least square method, straight line to be fitted according to the gray average discrete point；
Computing unit, for calculating the distance of all gray average discrete points and the straight line；
First index unit, for will calculate gained it is all apart from sum as brightness uniformity index parameter.
In some embodiments of the invention, the standard light source lamp house is briliancy case.
In some embodiments of the invention, the object of reference is 24 colour atlas.The colour atla includes 24 kinds of colors.
It is appreciated that the function of each functional module of the detection means of the panorama camera uniformity of the embodiment of the present invention can
Method specific implementation in above method embodiment, its specific implementation process can refer to the correlation in above method embodiment
Description, here is omitted.
Therefore in some feasible embodiments of the present invention, by taking out frame to video, calculating average gray
And color value, and make difference respectively and seek mean square deviation, brightness uniformity index parameter and colour consistency index ginseng can be finally provided
Number, from can effectively assess panorama camera uniformity effect in terms of brightness and color, can quantify.
In the above-described embodiments, the description to each embodiment all emphasizes particularly on different fields, and is not described in some embodiment
Part, may refer to the associated description of other embodiments.
To sum up, the detection means of panorama camera of embodiment of the present invention uniformity, in some feasible embodiment party of the present invention
In formula, by taking out frame to video, calculating average gray and color value, and make difference respectively and seek mean square deviation, can finally provide bright
Coincident indicator parameter and colour consistency index parameter are spent, from can effectively assess panorama camera one in terms of brightness and color
Cause property effect, can quantify.
It should be noted that for foregoing each method embodiment, in order to be briefly described, therefore it is all expressed as a series of
Combination of actions, but those skilled in the art should know, the present invention is not limited by described sequence of movement because according to
According to the present invention, some steps can use other orders or carry out simultaneously.Secondly, those skilled in the art should also know,
Embodiment described in this description belongs to preferred embodiment, and not necessarily the present invention must for involved action and module
Must.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment is can
To instruct the hardware of correlation to complete by program, the program can be stored in a computer-readable recording medium, storage
Medium can include：ROM, RAM, disk or CD etc..
The detection method and device of the panorama camera uniformity provided above the embodiment of the present invention have been carried out in detail
Introduce, specific case used herein is set forth to the principle and embodiment of the present invention, the explanation of above example
It is only intended to help the method and its core concept for understanding the present invention；Meanwhile for those of ordinary skill in the art, according to this
The thought of invention, there will be changes in specific embodiments and applications, in summary, this specification content should
It is interpreted as limitation of the present invention.
Claims (6)
1. a kind of detection method of panorama camera uniformity, the panorama camera have more than two cameras, its feature exists
In methods described includes：
The video of panorama camera shooting is carried out taking out frame, the video is placed in equivalent for each camera of panorama camera
Brightness, video captured in the environment of equivalent marker；
The average gray for taking out the video image that frame obtains is obtained, respectively puts down each average gray of acquisition with the gray scale
It is poor that gray scale reference point corresponding to average is made, will be all poor and as brightness uniformity index parameter；The average gray leads to
Cross and count the grey level histogram of each frame video image and obtain；
The color value for taking out the marker in the video image that frame obtains captured by each camera is obtained, calculates obtain respectively
The mean square deviation of the color reference point corresponding with the color value of the color value captured by each camera taken, by all mean square deviations
And be used as colour consistency index parameter；
Methods described also includes：
The standard light source lamp house and equivalent marker that are equal with the camera quantity identical are respectively placed in advance
Before the camera；When the brightness degree of standard light source lamp house has K, then the video of the panorama camera shooting regards for K sections
Frequently；Wherein K is natural number, identical with the brightness degree of the quasi- luminous source lamp box under section video capture, under different section video captures
The brightness degree of quasi- luminous source lamp box is different；
It is described to obtain the average gray for taking out the video image that frame obtains, respectively by each average gray of acquisition and the ash
Spend gray scale reference point corresponding to average value make it is poor, will be all poor and include as brightness uniformity index parameter：
Acquisition takes out frame and obtains the average gray of each video image, is drawn according to the brightness degree and the average gray
The gray average discrete point of two dimension；
Using least square method, straight line is fitted according to the gray average discrete point；
Calculate the distance of all gray average discrete points and the straight line；
Will calculate gained it is all apart from sum as brightness uniformity index parameter.
2. according to the method for claim 1, it is characterised in that the standard light source lamp house is briliancy case.
3. according to the method for claim 1, it is characterised in that the object of reference is 24 colour atlas.
4. a kind of detection means of panorama camera uniformity, the panorama camera have more than two cameras, its feature exists
In described device includes：
Frame module is taken out, the video for being shot to the panorama camera carries out taking out frame, and the video is each of panorama camera
Camera is placed in equivalent brightness, video captured in the environment of equivalent marker；
First acquisition module, the average gray for the video image that frame obtains is taken out for obtaining, respectively by each ash of acquisition
Spend corresponding with the average gray gray scale reference point of average value make it is poor, will be all poor and as brightness uniformity index ginseng
Number；The average gray is obtained by counting the grey level histogram of each frame video image；
Second acquisition module, marker in the video image that frame obtains captured by each camera is taken out for obtaining
Color value, the equal of color value color reference point corresponding with the color value captured by each camera of acquisition is calculated respectively
Variance, using all mean square deviations and as colour consistency index parameter；
Described device also includes：
The standard light source lamp house and equivalent marker being equal with the camera quantity identical, for putting respectively in advance
Before the camera；When the brightness degree of standard light source lamp house has K, then the video of the panorama camera shooting is K sections
Video；Wherein K is natural number, identical with the brightness degree of the quasi- luminous source lamp box under section video capture, under different section video captures
Quasi- luminous source lamp box brightness degree it is different；
First acquisition module includes：
Acquiring unit, take out frame for obtaining and obtain the average gray of each video image, according to the brightness degree with it is described
Average gray draws the gray average discrete point of two dimension；
Fitting a straight line unit, for using least square method, straight line to be fitted according to the gray average discrete point；
Computing unit, for calculating the distance of all gray average discrete points and the straight line；
First index unit, for will calculate gained it is all apart from sum as brightness uniformity index parameter.
5. device according to claim 4, it is characterised in that the standard light source lamp house is briliancy case.
6. device according to claim 4, it is characterised in that the object of reference is 24 colour atlas.
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| CN106572312B (en) * | 2016-11-16 | 2020-08-04 | 深圳市梦网视讯有限公司 | Panoramic video self-adaptive illumination compensation method and system |
| CN106990669B (en) * | 2016-11-24 | 2019-07-26 | 深圳市圆周率软件科技有限责任公司 | A kind of panorama camera mass production method and system |
| CN107222683A (en) * | 2017-07-17 | 2017-09-29 | 深圳市东视讯科技有限公司 | Binocular panorama camera produces lens articulation coherence method and system |
| WO2019031306A1 (en) * | 2017-08-07 | 2019-02-14 | シャープ株式会社 | Generation device, reproduction device, generation method, reproduction method, control program, and recording medium |
| CN107360418B (en) * | 2017-09-21 | 2019-12-27 | 长沙全度影像科技有限公司 | Panoramic camera color consistency judging system and method |
| CN107705266B (en) * | 2017-10-12 | 2020-03-27 | 长沙全度影像科技有限公司 | Panoramic camera lens classification method |
| CN107979726B (en) * | 2017-11-28 | 2020-05-22 | 信利光电股份有限公司 | Panoramic lens pairing method and panoramic lens |
| CN110264564B (en) * | 2019-05-24 | 2022-12-06 | 河北科技大学 | Film and television style simulation method based on color chart mapping and histogram mapping |
| CN111551253A (en) * | 2020-05-25 | 2020-08-18 | 重庆冠雁科技有限公司 | Calibration method for ensuring consistency of spectrum modules |
| CN114079768B (en) * | 2020-08-18 | 2023-12-05 | 杭州海康汽车软件有限公司 | Image definition testing method and device |
| CN113055659B (en) * | 2021-03-11 | 2022-10-25 | Oppo广东移动通信有限公司 | Color compensation parameter generation method and device, computer equipment and storage medium |
| CN113132694B (en) * | 2021-04-19 | 2022-05-31 | 北京理工大学 | Colourity-based color consistency correction method for multi-camera lens of colour camera |
| CN115618051B (en) * | 2022-12-20 | 2023-03-21 | 楠楠聚智信息科技有限责任公司 | Internet-based smart campus monitoring video storage method |
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| CN100539711C (en) * | 2008-04-10 | 2009-09-09 | 清华大学 | A kind of camera color calibration method that is applicable to spherical surface camera array |
| CN101616336B (en) * | 2009-07-13 | 2010-11-10 | 清华大学 | Color calibration system for camera array and method thereof |
| CN102158727B (en) * | 2011-03-31 | 2013-09-11 | Tcl通讯（宁波）有限公司 | Method and system for detecting color reducibility of camera of mobile phone |
| CN202475666U (en) * | 2011-12-31 | 2012-10-03 | 深圳市数据通计算机网络系统有限公司 | Camera image color reductibility testing system |
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