CN105430376A - Method and device for detecting consistency of panoramic camera - Google Patents
Method and device for detecting consistency of panoramic camera Download PDFInfo
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- CN105430376A CN105430376A CN201510772853.1A CN201510772853A CN105430376A CN 105430376 A CN105430376 A CN 105430376A CN 201510772853 A CN201510772853 A CN 201510772853A CN 105430376 A CN105430376 A CN 105430376A
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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
Abstract
The invention discloses a method and a device for detecting consistency of a panoramic camera, which are used for the technical field of panoramic cameras. The method comprises the following steps of carrying out frame extraction on a video shot by the panoramic camera, wherein the video is shot under the environment that each camera of the panoramic camera is at the same brightness and faces to the same standard reference; obtaining a mean gray value of a video image obtained by frame extraction, respectively obtaining a difference between each obtained mean gray value and a gray reference value corresponding to the mean gray value and taking a sum of all differences as a brightness consistency index parameter; obtaining a color value of the standard reference shot by each camera in the video image obtained by frame extraction and a mean square error of a color reference value corresponding to the color value, and taking a sum of all mean square errors as a color consistency index parameter. According to the method and the device, a consistency effect of the panoramic camera in the aspects of brightness and color can be effectively evaluated and quantized.
Description
Technical field
The present invention relates to panorama camera technical field, be specifically related to the conforming detection method of a kind of panorama camera and device.
Background technology
At present, panorama camera has progressively started to popularize, and wherein most crucial is exactly that multi-channel video splices in real time.Panorama camera has at least plural camera, when the environment that each camera is seen is different, due to the difference that camera itself exists illumination and color, adding the difference between the stitching algorithm that compensates brightness and color, there is brightness and the inconsistent problem of color in the panoramic video that finally result in output.Even if the environment that each camera is seen is the same, also can there is brightness and the inconsistent problem of color in its panoramic video exported.
At present to the brightness of panorama camera and the evaluation of consistency of colour effect, adopt the method directly detected by an unaided eye, this determination methods by subjective consciousness cannot quantize.Visible, lack a kind of technology assessing panorama camera consistency effect in brightness and color at present.
Summary of the invention
The embodiment of the present invention provides the conforming detection method of a kind of panorama camera and device, to provide a kind of assessment panorama camera consistency effect in brightness and color.
First aspect present invention provides a kind of panorama camera conforming detection method, and described panorama camera has plural camera, and described method comprises:
Take out frame to the video that described panorama camera is taken, described video is that each camera of panorama camera is placed in equivalent brightness, video captured under the environment of equivalent marker;
Obtain and take out the average gray of the video image that frame obtains, the gray scale reference point respectively by corresponding with this average gray for each average gray obtained is poor, using all differences and as brightness uniformity index parameter;
Obtain the color value of the marker taken out in video image that frame obtains captured by each camera, calculate the mean square deviation of the color value captured by each camera of the acquisition color reference point corresponding with this color value respectively, using all mean square deviations and as colour consistency index parameter.
Second aspect present invention provides a kind of panorama camera conforming checkout gear, and described panorama camera has plural camera, and described device comprises:
Take out frame module, take out frame for the video taken described panorama camera, described video is that each camera of panorama camera is placed in equivalent brightness, video captured under the environment of equivalent marker;
First acquisition module, for obtaining the average gray taking out the video image that frame obtains, respectively by poor for each average gray gray scale reference point corresponding with this average gray obtained, using all differences and as brightness uniformity index parameter;
Second acquisition module, for obtaining the color value of the marker taken out in video image that frame obtains captured by each camera, calculate the mean square deviation of the color value captured by each camera of the acquisition color reference point corresponding with this color value respectively, using all mean square deviations and as colour consistency index parameter.
Therefore, the embodiment of the present invention is by taking out frame, calculating average gray and color value to video, and make difference respectively and ask mean square deviation, brightness uniformity index parameter and colour consistency index parameter finally can be provided, from panorama camera consistency effect in brightness and color effectively can be assessed, can quantize.
Accompanying drawing explanation
In order to be illustrated more clearly in embodiment of the present invention technical scheme, be briefly described to the accompanying drawing used required in embodiment and description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the flow chart of the conforming detection method of panorama camera that the embodiment of the present invention provides;
Fig. 2 is an exemplary plot of the panorama camera conforming detection method Plays luminous source lamp box placement that the embodiment of the present invention provides;
Fig. 3 is an exemplary plot of the straight line simulated in the conforming detection method of panorama camera that the embodiment of the present invention provides;
Fig. 4 is an exemplary plot of the 24 colour chart pictures extracted in the conforming detection method of panorama camera that the embodiment of the present invention provides;
Fig. 5 is the logical construction schematic diagram of the conforming checkout gear of panorama camera that the embodiment of the present invention provides.
Embodiment
The embodiment of the present invention provides a kind of panorama camera conforming detection method, to assess panorama camera consistency effect in brightness and color.The embodiment of the present invention also provides corresponding a kind of panorama camera conforming checkout gear.
The present invention program is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a part of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, should belong to the scope of protection of the invention.
Below by specific embodiment, be described in detail respectively.
Please refer to Fig. 1, the conforming detection method of a kind of panorama camera that the embodiment of the present invention provides, can comprise:
110, take out frame to the video that described panorama camera is taken, described video is that each camera of panorama camera is placed in equivalent brightness, video captured under the environment of equivalent marker.
In some embodiments of the invention, also comprise before step 110:
Before in advance the equivalent standard light source lamp house identical with described camera quantity and equivalent marker being placed in described camera respectively.
The described video taken described panorama camera is taken out frame and is comprised:
Take out frame to the video of more than two sections that described panorama camera is taken, wherein, the brightness degree with the accurate luminous source lamp box under section video capture is identical, and the brightness degree of the accurate luminous source lamp box under different section video capture is different.
In some embodiments of the invention, described standard light source lamp house is briliancy case.
Because panorama camera generally has at least two or more camera, suppose need measure panorama camera there is N number of camera, wherein, N be greater than 2 natural number.During the step 120 stated after execution, preferably, N number of standard light source lamp house can be adopted, please refer to Fig. 2, Fig. 2 have employed four standard light source lamp houses 10, faces the center of each camera 11 respectively, preferably, standard light source lamp house 10 specifically can adopt briliancy case, and this briliancy case is provided with one piece can send equal white light, the panel that brightness degree is adjustable.
In some embodiments of the invention, the camera of described panorama camera is evenly distributed on a ball, and the center of each camera faces a briliancy case.All gray scale casees are living briliancy casees, and namely equivalent briliancy case, each briliancy case is equipped with an object of reference, and all objects of reference are the same namely equivalent object of reference.Thus the camera of described panorama camera can be made a to be in brightness is equal to, object of reference is equivalent environment.
During the step 120 stated after execution, preferably, can be positioned in a black room together with panorama camera and the N number of standard light source lamp house aimed at each camera, the brightness degree of all briliancy casees is regulated to be after 1, utilize panorama camera to take one section of video, the brightness degree adjusting all briliancy casees is after 2, and recycling panorama camera takes one section of video, that is the brightness degree with the briliancy case under section video capture is identical, and the brightness degree of the briliancy case under different section video capture is different.When gray scale case has multiple brightness degree, optionally the grade of more than 2 wherein capture video can be carried out.Preferably, when the brightness degree of gray scale case has K, wherein K is natural number, then the video of described panorama camera shooting is K section video, in the embodiment of the present invention, the K section video that the step that the described video taken described panorama camera takes out frame is specially described panorama camera is taken takes out frame.The video hop count of shooting is more, and the result of calculation of later-mentioned step 120 is more accurate.
120, obtain and take out the average gray of the video image that frame obtains, the gray scale reference point respectively by corresponding with this average gray for each average gray obtained is poor, using all differences and as brightness uniformity index parameter.
In some embodiments of the invention, the average gray of the video image that frame obtains is taken out in described acquisition, respectively by poor for each average gray gray scale reference point corresponding with this average gray obtained, using all differences and comprise as brightness uniformity index parameter:
Obtain and take out the average gray that frame obtains each video image, draw the gray average discrete point of two dimension according to described brightness degree and described average gray;
Utilize least square method, simulate straight line according to described gray average discrete point;
Calculate the distance of all gray average discrete points and described straight line;
To all distance sums of gained be calculated as brightness uniformity index parameter.
For ease of better understanding the technical scheme that the embodiment of the present invention provides, illustrate as follows:
Because brightness degree is linear, to take 6 sections of videos, abovementioned steps 110 can take out frame respectively to 6 sections of videos of panorama camera shooting, step 120 is specifically by adding up the grey level histogram of each frame, ask an average gray, that is each section of video has a gray average, finally draw a two-dimentional gray average discrete point out according to brightness degree and average gray, utilize the method for least square, gray average discrete point according to drawing simulates straight line out, obtain the distance sum of all gray averages to fitting a straight line, this distance sum and the brightness uniformity index parameter being exactly panorama camera.Please refer to Fig. 3, is the example of straight line simulated.When distance sum is larger, this brightness uniformity index parameter is larger, the brightness uniformity of panorama camera is poorer, when distance sum more hour, this brightness uniformity index parameter is less, the brightness uniformity of panorama camera is better, and under ideal conditions, all gray average points should be positioned on the straight line of matching.
130, the color value of the marker taken out in video image that frame obtains captured by each camera is obtained, calculate the mean square deviation of the color value captured by each camera of the acquisition color reference point corresponding with this color value respectively, using all mean square deviations and as colour consistency index parameter.
When all mean square deviations and larger time, illustrates that the colour consistency of panorama camera is poorer, when all mean square deviations with get over hour, illustrate that the colour consistency of panorama camera is less.
In some embodiments of the invention, preferably, described object of reference is colour atla, and described colour atla comprises 24 kinds of colors.
In a particular application, also can adopt any equivalent object of reference, be not limited to the present invention.
For ease of better understanding the technical scheme that the embodiment of the present invention provides, be introduced below by an example.
In black room, first panorama camera is positioned in light box, each camera of panorama camera faces a standard light source lamp house, four perisporiums of standard light source lamp house post 24 colour atlas of standard, to guarantee that each camera can see complete 24 colour atlas, adopt under the illumination of D65 standard sources, record one section of video, comprise 24 colour chart pictures captured by each camera taking out video image that frame obtains, first can extract each 24 colour chart pictures as shown in Figure 4 from video image, then 24 kinds of color values in 24 regions in each 24 colour chart pictures are obtained, because colour atla color reference point under standard sources is fixing known, finally by the mean square deviation of the color value color reference point corresponding with this color value calculated captured by each camera of obtaining, using all mean square deviations and as colour consistency index parameter.
Suppose there is N number of camera facing to N block 24 colour atla, each block 24 colour atla has 24 kinds of colors, N block 24 colour atla region is had in panorama sketch, suppose to only have four cameras, so have 4 piece of 24 colour atla region in panorama sketch, a kind of color region of each block 24 colour atla, a red channel average can be calculated, green channel average, blue channel average, three averages form the color value that a vector represents this part color region, each block 24 colour atla has 24 vectors, color reference point is also have 24 vectors, 24 vectors of four piece of 24 colour atla ask mean square deviation with 24 vectors of the color reference point of standard respectively, the value obtained is exactly the error that this block colour atla departs from the color reference point of standard, four 24 colour atla mean square deviations additions are exactly the colour consistency index parameter of panorama camera.
Therefore, in feasible execution modes more of the present invention, by taking out frame to video, calculating average gray and color value, and make difference respectively and ask mean square deviation, brightness uniformity index parameter and colour consistency index parameter finally can be provided, from panorama camera consistency effect in brightness and color effectively can be assessed, can quantize.
In order to better implement the such scheme of the embodiment of the present invention, be also provided for below coordinating the relevant apparatus implementing such scheme.
Please refer to Fig. 5, the embodiment of the present invention provides a kind of panorama camera conforming checkout gear 50, and described panorama camera has plural camera, and described device can comprise:
Take out frame module 510, take out frame for the video taken described panorama camera, described video is that each camera of panorama camera is placed in equivalent brightness, video captured under the environment of equivalent marker;
First acquisition module 520, for obtaining the average gray taking out the video image that frame obtains, respectively by poor for each average gray gray scale reference point corresponding with this average gray obtained, using all differences and as brightness uniformity index parameter;
Second acquisition module 530, for obtaining the color value of the marker taken out in video image that frame obtains captured by each camera, calculate the mean square deviation of the color value captured by each camera of the acquisition color reference point corresponding with this color value respectively, using all mean square deviations and as colour consistency index parameter.
In some embodiments of the invention, described device also comprises:
The equivalent standard light source lamp house identical with described camera quantity and equivalent marker, before being placed in described camera respectively in advance;
Described first acquisition module 520, the video of more than two sections specifically for taking described panorama camera takes out frame, gray scale reference point respectively by corresponding with this average gray for each average gray obtained is poor, using all differences and as brightness uniformity index parameter, wherein, brightness degree with the accurate luminous source lamp box under section video capture is identical, and the brightness degree of the accurate luminous source lamp box under different section video capture is different.
In some embodiments of the invention, described first acquisition module 520 comprises:
Acquiring unit, takes out for obtaining the average gray that frame obtains each video image, draws the gray average discrete point of two dimension according to described brightness degree and described average gray;
Fitting a straight line unit, for utilizing least square method, simulates straight line according to described gray average discrete point;
Computing unit, for calculating the distance of all gray average discrete points and described straight line;
First index unit, for calculating all distance sums of gained as brightness uniformity index parameter.
In some embodiments of the invention, described standard light source lamp house is briliancy case.
In some embodiments of the invention, described object of reference is 24 colour atlas.Described colour atla comprises 24 kinds of colors.
Be appreciated that, the function of each functional module of the conforming checkout gear of panorama camera of the embodiment of the present invention can according to the method specific implementation in said method embodiment, its specific implementation process can refer to the associated description in said method embodiment, repeats no more herein.
Therefore, in feasible execution modes more of the present invention, by taking out frame to video, calculating average gray and color value, and make difference respectively and ask mean square deviation, brightness uniformity index parameter and colour consistency index parameter finally can be provided, from panorama camera consistency effect in brightness and color effectively can be assessed, can quantize.
In the above-described embodiments, the description of each embodiment is all emphasized particularly on different fields, in certain embodiment, there is no the part described in detail, can see the associated description of other embodiment.
To sum up, the conforming checkout gear of embodiment of the present invention panorama camera, in feasible execution modes more of the present invention, by taking out frame to video, calculating average gray and color value, and make difference respectively and ask mean square deviation, brightness uniformity index parameter and colour consistency index parameter finally can be provided, from panorama camera consistency effect in brightness and color effectively can be assessed, can quantize.
It should be noted that, for aforesaid each embodiment of the method, in order to simple description, 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 by the restriction of described sequence of movement, because according to the present invention, some step can adopt other order or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in specification all belongs to preferred embodiment, and involved action and module might not be that the present invention is necessary.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment is that the hardware that can carry out instruction relevant by program has come, this program can be stored in a computer-readable recording medium, and storage medium can comprise: ROM, RAM, disk or CD etc.
The conforming detection method of panorama camera provided the embodiment of the present invention above and device are described in detail, apply specific case herein to set forth principle of the present invention and execution mode, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. the conforming detection method of panorama camera, described panorama camera has plural camera, it is characterized in that, described method comprises:
Take out frame to the video that described panorama camera is taken, described video is that each camera of panorama camera is placed in equivalent brightness, video captured under the environment of equivalent marker;
Obtain and take out the average gray of the video image that frame obtains, the gray scale reference point respectively by corresponding with this average gray for each average gray obtained is poor, using all differences and as brightness uniformity index parameter;
Obtain the color value of the marker taken out in video image that frame obtains captured by each camera, calculate the mean square deviation of the color value captured by each camera of the acquisition color reference point corresponding with this color value respectively, using all mean square deviations and as colour consistency index parameter.
2. method according to claim 1, is characterized in that, described method also comprises:
Before in advance the equivalent standard light source lamp house identical with described camera quantity and equivalent marker being placed in described camera respectively;
The described video taken described panorama camera is taken out frame and is comprised:
Take out frame to the video of more than two sections that described panorama camera is taken, wherein, the brightness degree with the accurate luminous source lamp box under section video capture is identical, and the brightness degree of the accurate luminous source lamp box under different section video capture is different.
3. method according to claim 2, it is characterized in that, the average gray of the video image that frame obtains is taken out in described acquisition, respectively by poor for each average gray gray scale reference point corresponding with this average gray obtained, using all differences and comprise as brightness uniformity index parameter:
Obtain and take out the average gray that frame obtains each video image, draw the gray average discrete point of two dimension according to described brightness degree and described average gray;
Utilize least square method, simulate straight line according to described gray average discrete point;
Calculate the distance of all gray average discrete points and described straight line;
To all distance sums of gained be calculated as brightness uniformity index parameter.
4. method according to claim 2, is characterized in that, described standard light source lamp house is briliancy case.
5. method according to claim 1, is characterized in that, described object of reference is 24 colour atlas.
6. the conforming checkout gear of panorama camera, described panorama camera has plural camera, it is characterized in that, described device comprises:
Take out frame module, take out frame for the video taken described panorama camera, described video is that each camera of panorama camera is placed in equivalent brightness, video captured under the environment of equivalent marker;
First acquisition module, for obtaining the average gray taking out the video image that frame obtains, respectively by poor for each average gray gray scale reference point corresponding with this average gray obtained, using all differences and as brightness uniformity index parameter;
Second acquisition module, for obtaining the color value of the marker taken out in video image that frame obtains captured by each camera, calculate the mean square deviation of the color value captured by each camera of the acquisition color reference point corresponding with this color value respectively, using all mean square deviations and as colour consistency index parameter.
7. device according to claim 6, is characterized in that, described device also comprises:
The equivalent standard light source lamp house identical with described camera quantity and equivalent marker, before being placed in described camera respectively in advance;
Described first acquisition module, the video of more than two sections specifically for taking described panorama camera takes out frame, gray scale reference point respectively by corresponding with this average gray for each average gray obtained is poor, using all differences and as brightness uniformity index parameter, wherein, brightness degree with the accurate luminous source lamp box under section video capture is identical, and the brightness degree of the accurate luminous source lamp box under different section video capture is different.
8. device according to claim 7, is characterized in that, described first acquisition module comprises:
Acquiring unit, takes out for obtaining the average gray that frame obtains each video image, draws the gray average discrete point of two dimension according to described brightness degree and described average gray;
Fitting a straight line unit, for utilizing least square method, simulates straight line according to described gray average discrete point;
Computing unit, for calculating the distance of all gray average discrete points and described straight line;
First index unit, for calculating all distance sums of gained as brightness uniformity index parameter.
9. device according to claim 7, is characterized in that, described standard light source lamp house is briliancy case.
10. device according to claim 6, is characterized in that, described object of reference is 24 colour atlas.
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