CN104994307A - Image correction method and image correction device - Google Patents
Image correction method and image correction device Download PDFInfo
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- CN104994307A CN104994307A CN201510378173.1A CN201510378173A CN104994307A CN 104994307 A CN104994307 A CN 104994307A CN 201510378173 A CN201510378173 A CN 201510378173A CN 104994307 A CN104994307 A CN 104994307A
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Abstract
Embodiments of the invention provide an image correction method and an image correction device. The image correction method comprises the following steps of receiving a wide-angle image shot by utilizing a wide-angle lens; computing a correction position of each pixel point according to an original position of each pixel point in the wide-angle image and a pre-obtained position correction function, wherein the position correction function is a function relationship between the original position and the correction position of each pixel point in the image shot by the wide-angle lens under a concentric zone model; and correcting the wide-angle image according to the correction position of each pixel point to obtain a correction image. The concentric zone model adopted by the method more conforms to the lens characteristics of the wide-angle lens, the lens is basically centrally symmetrical, and the position correction function obtained based on the model is more accurate, so that a correction result, which more conforms to the actual condition, can be obtained, and furthermore, in comparison with the methods, such as a block model, a computational process of the method is simpler, the calculated amount can be reduced and the image correction efficiency can be improved.
Description
Technical field
The present invention relates to technical field of image processing, particularly relate to a kind of method for correcting image and a kind of image correction apparatus.
Background technology
Along with the develop rapidly of Internet technology, people not only can carry out information search easily on the internet, can also be engaged in various amusement and recreation activity, such as, watch video.At present, the video image that people watch typically use standard lens obtain, visual field is narrower.And wide-angle lens has unique wide open, can make up the shortcoming that standard lens visual field is narrow, from the angle of video information, wide-angle lens can get wider video image.
But the shortcoming of wide-angle lens is that captured image has serious distortion, this directly can reduce the video perception of user.Therefore, be how that general perspective projection image is extremely important the image rectification that wide-angle lens shooting obtains.
At present, be utilize plane perspective Projection Constraint to the bearing calibration of wide-angle lens photographic images, by distortion correction model the drop shadow curve of space line is mapped as the straight line on the plane of delineation, wherein, distortion correction model often adopts block models.But the method operation is comparatively loaded down with trivial details, and amount of calculation is comparatively large, lower to the correction efficiency of image.
Therefore, the technical problem needing those skilled in the art urgently to solve at present is exactly: the correction efficiency how improving image.
Summary of the invention
Embodiment of the present invention technical problem to be solved is to provide a kind of method for correcting image, can improve image rectification efficiency.
Accordingly, the embodiment of the present invention additionally provides a kind of image correction apparatus, in order to ensure the implementation and application of said method.
In order to solve the problem, the invention discloses a kind of method for correcting image, comprising:
Receive the wide angle picture utilizing wide-angle lens to take;
According to the home position of pixel each in described wide angle picture, and the position correction function obtained in advance, calculate the correction position of each pixel, wherein, described position correction function is the functional relation in the described wide-angle lens photographic images obtained under concentric circles pattern between pixel home position and correction position;
Correction position according to described each pixel corrects described wide angle picture, obtains correcting image.
Further, the method obtaining described position correction function comprises:
Obtain concentric circles model image;
Described wide-angle lens is utilized to take the wide angle picture obtaining concentric circles model;
According to the position of pixel in the wide angle picture of described concentric circles model image and described concentric circles model, calculate and obtain described position correction function.
Further, the described position according to pixel in the wide angle picture of described concentric circles model image and described concentric circles model, calculates and obtains described position correction function, comprising:
According to the position of pixel in the wide angle picture of described concentric circles model image and described concentric circles model, the mode of function approximation is adopted to obtain described position correction function.
Further, the mode of described employing function approximation obtains described position correction function, comprising:
Image processor GPU is utilized to adopt interval mode of approaching fast to obtain described position correction function from tape function.
Further, the described image processor GPU that utilizes adopts interval mode of approaching fast to obtain described position correction function from tape function, comprising:
The mode of triangle function approximate is adopted to obtain described position correction function.
The embodiment of the present invention additionally provides a kind of image correction apparatus, comprising:
Image receiving unit, for receiving the wide angle picture utilizing wide-angle lens to take;
Computing unit, for the home position according to pixel each in described wide angle picture, and the position correction function obtained in advance, calculate the correction position of each pixel, wherein, described position correction function is the functional relation in the described wide-angle lens photographic images obtained under concentric circles pattern between pixel home position and correction position;
Correcting unit, for correcting described wide angle picture according to the correction position of described each pixel, obtains correcting image.
Further, described device also comprises:
Correction function acquiring unit, for obtaining described position correction function in advance;
Described correction function acquiring unit comprises:
First obtains subelement, for obtaining concentric circles model image;
Second obtains subelement, takes for utilizing described wide-angle lens the wide angle picture obtaining concentric circles model;
Computation subunit, for the position according to pixel in the wide angle picture of described concentric circles model image and described concentric circles model, calculates and obtains described position correction function.
Further, described computation subunit, specifically for the position according to pixel in the wide angle picture of described concentric circles model image and described concentric circles model, adopts the mode of function approximation to obtain described position correction function.
Further, described computation subunit, adopts interval mode of approaching fast to obtain described position correction function specifically for utilizing image processor GPU from tape function.
Further, described computation subunit, obtains described position correction function specifically for adopting the mode of triangle function approximate.
Compared with prior art, the embodiment of the present invention comprises following advantage:
The embodiment of the present invention by obtaining position correction function under concentric circles pattern, and utilizes this position correction function to obtain the correction position of the various pixel of wide angle picture, thus can obtain correcting image.The concentric circles pattern that the method adopts more meets the lens characteristics of wide-angle lens, substantially be centrosymmetric, the position correction function obtained based on this pattern is also just more accurate, and then, the correction result of actual conditions of more fitting can be obtained, and the method method computational processes such as block models of comparing are easier, can reduce amount of calculation, improve image rectification efficiency.
Accompanying drawing explanation
Fig. 1 is the flow chart of steps of a kind of method for correcting image embodiment of the present invention;
Fig. 2 is a kind of flow chart of steps obtaining the embodiment of the method for position correction function of the present invention;
Fig. 3 is the schematic diagram of a kind of concentric circles model image of the embodiment of the present invention;
Fig. 4 is the schematic diagram of the wide angle picture of the concentric circles model image shown in Fig. 3;
Fig. 5 is the curve chart of a kind of f (z) of the embodiment of the present invention;
Fig. 6 is a bit of curve chart of cos function;
Fig. 7 is the interval curve figure in the function curve of cos shown in Fig. 6;
Fig. 8 is the structured flowchart of a kind of image correction apparatus embodiment of the present invention;
Fig. 9 is the structured flowchart of another kind of image correction apparatus embodiment of the present invention;
Figure 10 is the structured flowchart of a kind of correction function acquiring unit of the embodiment of the present invention.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, and below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
With reference to Fig. 1, show the flow chart of steps of a kind of method for correcting image embodiment of the present invention, specifically can comprise the steps:
Step 101, receives the wide angle picture utilizing wide-angle lens to take.
In the embodiment of the present invention, the device (hereinafter referred to as this device) for image rectification can be GPU (Graphics Processing Unit, image processor) itself, also can be one independently can be mutual with GPU device.
Take utilizing wide-angle lens after obtaining wide angle picture, this wide angle picture is transferred to this device.
Step 102, according to the home position of pixel each in wide angle picture, and the position correction function obtained in advance, calculate the correction position of each pixel, wherein, this position correction function is the functional relation in the wide-angle lens photographic images obtained under concentric circles pattern between pixel home position and correction position.
Needed to obtain position correction function in advance before this step of execution, this position correction function characterizes the functional relation in wide-angle lens photographic images between pixel home position and correction position.This position correction function can obtain under concentric circles pattern, this concentric circles pattern more meets the lens characteristics of wide-angle lens, substantially be centrosymmetric, namely home position is positioned on the optical axis of camera lens substantially, there is deformation hardly in this position, along concentrically ringed diametric(al), the deformation that the concentric circles that diameter is larger occurs is larger, therefore the position correction function obtained based on this pattern is more fitted actual conditions, and then can obtain and correct result more accurately, and calculate easier, can amount of calculation be reduced, improve computational efficiency.The concrete computational process of this position correction function refers to the description of subsequent embodiment.
After acquisition position correction function, both can, according to the home position of pixel each in wide angle picture, position correction function be utilized to obtain the correction position of each pixel in this step.
Step 103, the correction position according to each pixel corrects described wide angle picture, obtains correcting image.
After the correction position obtaining pixel, each pixel is carried out resetting or adjusting according to correction position, can correcting image be obtained.
The embodiment of the present invention by obtaining position correction function under concentric circles pattern, and utilizes this position correction function to obtain the correction position of the various pixel of wide angle picture, thus can obtain correcting image.The concentric circles pattern that the method adopts more meets the lens characteristics of wide-angle lens, substantially be centrosymmetric, the position correction function obtained based on this pattern is also just more accurate, and then, the correction result of actual conditions of more fitting can be obtained, and the method method computational processes such as block models of comparing are easier, can reduce amount of calculation, improve image rectification efficiency.
In another embodiment of the invention, as shown in Figure 2, the method obtaining position correction function can comprise:
Step 201, obtains concentric circles model image.
This step can be the concentric circles model image first obtained as shown in Figure 3.
Step 202, utilizes wide-angle lens to take the wide angle picture obtaining concentric circles model.
Utilize and take this concentric circles model with the wide-angle lens of aforementioned wide-angle lens or same model, obtain the wide angle picture of concentric circles model as shown in Figure 4.As shown in Figure 4, the home position of this concentric circles model is positioned on the optical axis of camera lens substantially, and this position hardly deformation occurs, and along concentrically ringed diametric(al), the deformation that the concentric circles that diameter is larger occurs is larger, and deformation is centrosymmetric substantially.
Step 203, according to the position of pixel in the wide angle picture of concentric circles model image and concentric circles model, calculates and obtains position correction function.
Relatively this concentric circles model image and wide angle picture thereof, by the position (i.e. the correction position of pixel) of a functional relation by corresponding pixel points in pixel position (i.e. the home position of the pixel) matching to concentric circles model image in wide angle picture, can complete the correction of figure, this functional relation is position correction function.
In the present embodiment, suppose that any pixel home position coordinate is for (x, y), the functional relation between pixel home position and its correction position coordinate also namely position correction function be:
(x’，y’)＝f(z)*sqrt(x
2+y
2)*(x，y)
Wherein, sqrt is sqrt computing.
In above-mentioned functional relation, as long as determine that f (z) can determine this position correction function.
The present embodiment can be adopt the mode of function approximation to determine f (z), and then obtains position correction function.In order to accelerate computational process, image processor GPU can be utilized to adopt interval mode of approaching fast to determine f (z) from tape function, and then obtain position correction function.Suppose that, in GPU, trigonometric function has hardware-accelerated, then the mode of the triangle function approximate that GPU can be adopted to carry determines f (z).
Suppose the image of f (z) as shown in Figure 5, the diverse location of trigonometric function then can be used to carry out matching to this part, the a bit of curve in cos function specifically can be adopted to carry out matching, (0.03 to the 0.05) interval of such as getting in the function curve of cos shown in Fig. 6 can obtain curve as shown in Figure 7, shown in this Fig. 7, curve approaches curve shown in Fig. 5, this matching obtains a minimum error, visually discernable hardly.
When f (z) function is too complicated, the mode that multiple trigonometric function also can be adopted to combine carries out matching.
The present embodiment is by using approaching from tape function of GPU, and can get result very fast, performance is higher, very easily can realize the effect of process in real time.
It should be noted that, for 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 embodiment of the present invention is not by the restriction of described sequence of movement, because according to the embodiment of the present invention, some step can adopt other orders 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 might not be that the embodiment of the present invention is necessary.
With reference to Fig. 8, show the structured flowchart of a kind of image correction apparatus embodiment of the present invention, specifically can comprise as lower unit:
Image receiving unit 801, for receiving the wide angle picture utilizing wide-angle lens to take.
Computing unit 802, for the home position according to pixel each in described wide angle picture, and the position correction function obtained in advance, calculate the correction position of each pixel, wherein, described position correction function is the functional relation in the described wide-angle lens photographic images obtained under concentric circles pattern between pixel home position and correction position.
Correcting unit 803, for correcting described wide angle picture according to the correction position of described each pixel, obtains correcting image.
In the embodiment of the present invention, this device obtains position correction function by said units under concentric circles pattern, and utilizes this position correction function to obtain the correction position of the various pixel of wide angle picture, thus can obtain correcting image.The concentric circles pattern that this device adopts more meets the lens characteristics of wide-angle lens, substantially be centrosymmetric, the position correction function obtained based on this pattern is also just more accurate, and then, the correction result of actual conditions of more fitting can be obtained, and this device method computational processes such as block models of comparing are easier, can reduce amount of calculation, improve image rectification efficiency.
In another embodiment, as shown in Figure 9, this device can also comprise:
Correction function acquiring unit 901, for obtaining described position correction function in advance.
As shown in Figure 10, this correction function acquiring unit 901 may further include:
First obtains subelement 1001, for obtaining concentric circles model image.
Second obtains subelement 1002, takes for utilizing described wide-angle lens the wide angle picture obtaining concentric circles model.
Computation subunit 1003, for the position according to pixel in the wide angle picture of described concentric circles model image and described concentric circles model, calculates and obtains described position correction function.
Wherein, computation subunit 1003, specifically may be used for the position of pixel in the wide angle picture according to described concentric circles model image and described concentric circles model, adopts the mode of function approximation to obtain described position correction function.Image processor GPU can be utilized to adopt interval mode of approaching fast to obtain described position correction function from tape function.The mode of triangle function approximate can be adopted to obtain described position correction function.
In the present embodiment, computation subunit is by using approaching from tape function of GPU, and can get result very fast, performance is higher, very easily can realize the effect of process in real time.
For device embodiment, due to itself and embodiment of the method basic simlarity, so description is fairly simple, relevant part illustrates see the part of embodiment of the method.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar part mutually see.
Those skilled in the art should understand, the embodiment of the embodiment of the present invention can be provided as method, device or computer program.Therefore, the embodiment of the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the embodiment of the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code.
The embodiment of the present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, terminal equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing terminal equipment to produce a machine, making the instruction performed by the processor of computer or other programmable data processing terminal equipment produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing terminal equipment, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded on computer or other programmable data processing terminal equipment, make to perform sequence of operations step to produce computer implemented process on computer or other programmable terminal equipment, thus the instruction performed on computer or other programmable terminal equipment is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
Although described the preferred embodiment of the embodiment of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of embodiment of the present invention scope.
Finally, also it should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or terminal equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or terminal equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the terminal equipment comprising described key element and also there is other identical element.
Above to a kind of method for correcting image provided by the present invention and a kind of image correction apparatus, be 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. a method for correcting image, is characterized in that, comprising:
Receive the wide angle picture utilizing wide-angle lens to take;
According to the home position of pixel each in described wide angle picture, and the position correction function obtained in advance, calculate the correction position of each pixel, wherein, described position correction function is the functional relation in the described wide-angle lens photographic images obtained under concentric circles pattern between pixel home position and correction position;
Correction position according to described each pixel corrects described wide angle picture, obtains correcting image.
2. method according to claim 1, is characterized in that, the method obtaining described position correction function comprises:
Obtain concentric circles model image;
Described wide-angle lens is utilized to take the wide angle picture obtaining concentric circles model;
According to the position of pixel in the wide angle picture of described concentric circles model image and described concentric circles model, calculate and obtain described position correction function.
3. method according to claim 2, is characterized in that, the described position according to pixel in the wide angle picture of described concentric circles model image and described concentric circles model, calculates and obtain described position correction function, comprising:
According to the position of pixel in the wide angle picture of described concentric circles model image and described concentric circles model, the mode of function approximation is adopted to obtain described position correction function.
4. method according to claim 3, is characterized in that, the mode of described employing function approximation obtains described position correction function, comprising:
Image processor GPU is utilized to adopt interval mode of approaching fast to obtain described position correction function from tape function.
5. method according to claim 4, is characterized in that, the described image processor GPU that utilizes adopts interval mode of approaching fast to obtain described position correction function from tape function, comprising:
The mode of triangle function approximate is adopted to obtain described position correction function.
6. an image correction apparatus, is characterized in that, comprising:
Image receiving unit, for receiving the wide angle picture utilizing wide-angle lens to take;
Computing unit, for the home position according to pixel each in described wide angle picture, and the position correction function obtained in advance, calculate the correction position of each pixel, wherein, described position correction function is the functional relation in the described wide-angle lens photographic images obtained under concentric circles pattern between pixel home position and correction position;
Correcting unit, for correcting described wide angle picture according to the correction position of described each pixel, obtains correcting image.
7. device according to claim 6, is characterized in that, described device also comprises:
Correction function acquiring unit, for obtaining described position correction function in advance;
Described correction function acquiring unit comprises:
First obtains subelement, for obtaining concentric circles model image;
Second obtains subelement, takes for utilizing described wide-angle lens the wide angle picture obtaining concentric circles model;
Computation subunit, for the position according to pixel in the wide angle picture of described concentric circles model image and described concentric circles model, calculates and obtains described position correction function.
8. device according to claim 7, is characterized in that,
Described computation subunit, specifically for the position according to pixel in the wide angle picture of described concentric circles model image and described concentric circles model, adopts the mode of function approximation to obtain described position correction function.
9. device according to claim 8, is characterized in that,
Described computation subunit, adopts interval mode of approaching fast to obtain described position correction function specifically for utilizing image processor GPU from tape function.
10. device according to claim 9, is characterized in that,
Described computation subunit, obtains described position correction function specifically for adopting the mode of triangle function approximate.
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