CN105739092B - A kind of method of double light path optical system and its image co-registration - Google Patents
A kind of method of double light path optical system and its image co-registration Download PDFInfo
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Abstract
The image interfusion method of a kind of double light path optical system of the present invention and double light path optical system, the fusion method comprise the following steps：Obtain the pixel value of target image corresponding pixel points and the pixel value of background image pixels point；The focal length and detector size of corresponding first optical system of background image are obtained, and according to the size of the focal length and detector, obtains the horizontal field of view angle of corresponding second optical system of target image；According to the pixel number of horizontal direction in the target image, the pixel value of target image corresponding pixel points, the Pixel Dimensions of the focal length of the first optical system and the first optical system, the pixel value of target image corresponding pixel points after being corrected；According to the pixel value of target image corresponding pixel points after amendment and the pixel value of background image pixels point, the image after being merged.The image of the image interfusion method can fit like a glove in non-central visual field, and the fusion method is simple and calculation amount is small, greatly reduce the requirement to system processing power.
Description
Technical field
The present invention relates to optical technical field, more particularly to a kind of image interfusion method of double light path optical system.
Background technology
Existing double light path optical system includes forming background information optical system and target information optical imaging system, leads to
The background image of background information optical system imaging offer is crossed, the image of target information optical imaging system can be timely and accurately
Positioning or tracking.The main feature point matching algorithm of image alignment at present, it is to extract target information by image segmentation algorithm
Characteristic area in picture, then region bone is extracted with Morphology Algorithm, then pair between characteristic point is found by matching algorithm
It should be related to, image is finally subjected to registration and obtains coordinate correspondence, finally realizes the alignment of two images.
But the gray scale due to the image acquired in different sensors usually has sizable difference with characteristic information, this
So that the registration of image becomes increasingly difficult.Also there is the problem of more, such as feature in current feature based point matching algorithm
Point matching algorithm is by calculating each point and other distances put, and comparison reference image and image midpoint subject to registration and point pair
Should be apart from same number come what is realized, this method can expend bigger calculation amount, and processing time is longer, the processing to system
Ability has higher requirement so that the image of two-way optical system is difficult to fit like a glove in non-central visual field.
The content of the invention
It is contemplated that solve at least some of the technical problems in related technologies.Mesh of the invention for this
Be propose a kind of image interfusion method of double light path optical system.
To achieve these goals, the image interfusion method of the double light path optical system of one aspect of the present invention embodiment, institute
Fusion method is stated to comprise the following steps:
Obtain the pixel value of target image corresponding pixel points and the pixel value of background image pixels point；
The focal length and detector size of corresponding first optical system of background image are obtained, and according to the focal length and detection
The size of device, obtains the horizontal field of view angle of corresponding second optical system of target image；
According to the pixel number of horizontal direction in the target image, the pixel value of target image corresponding pixel points,
The Pixel Dimensions of the focal length of one optical system and the first optical system, the pixel of target image corresponding pixel points after being corrected
Value；
According to the pixel value of target image corresponding pixel points after amendment and the pixel value of background image pixels point, merged
Image afterwards.
The fusion method of the embodiment of the present invention, when to target image and background image additive fusion, to target image
The pixel value of any pixel is modified, according to the pixel value and background image pixels of target image corresponding pixel points after amendment
The pixel value of point carries out image co-registration so that the image of two-way optical system can fit like a glove in non-central visual field, this melts
Conjunction method is simple and calculation amount is small, greatly reduces the requirement to system processing power, in addition in central vision and non-central regards
Field can reach good alignment result, have higher positioning accurate parasexuality.
To achieve these goals, the double light path optical system of another aspect of the present invention embodiment, the optical system bag
Include：
Acquisition module, for obtaining the pixel value of target image corresponding pixel points and the pixel value of background image pixels point；
First generation module, for obtaining the focal length and detector size of corresponding first optical system of background image, and
According to the size of the focal length and detector, the horizontal field of view angle of corresponding second optical system of target image is obtained；
Second generation module, for the pixel number according to horizontal direction in the target image, target image corresponds to
The Pixel Dimensions of the pixel value of pixel, the focal length of the first optical system and the first optical system, target image after being corrected
The pixel value of corresponding pixel points；
Fusion Module, for the picture according to the pixel value of target image corresponding pixel points after amendment and background image pixels point
Element value, the image after being merged.
The double light path optical system of the embodiment of the present invention, when to target image and background image additive fusion, to target
The pixel value of any pixel of image is modified, according to the pixel value and Background of target image corresponding pixel points after amendment
Image co-registration is carried out as the pixel value of pixel so that the image of two-way optical system can be kissed completely in non-central visual field
To close, the fusion method in the double light path optical system is simple and calculation amount is small, greatly reduces the requirement to system processing power,
In addition good alignment result can be reached in central vision and non-central visual field, there is higher positioning accurate parasexuality.
Brief description of the drawings
Fig. 1 is the flow chart of the image interfusion method of one embodiment of the invention double light path optical system,
Fig. 2 is the structure diagram of one embodiment of the invention double light path optical system.
Embodiment
The embodiment of the present invention is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or has the function of same or like element.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings the image of the double light path optical system and double light path optical system that describe the embodiment of the present invention melts
Conjunction method.
Fig. 1 is the flow chart of the image interfusion method of one embodiment double light path optical system according to the present invention.Such as Fig. 1 institutes
Show, the fusion method of the embodiment of the present invention, comprises the following steps：
Step S11, obtains the pixel value of target image corresponding pixel points and the pixel value of background image pixels point.
Step S12, obtains the focal length and detector size of corresponding first optical system of background image, and according to Jiao
Away from the size with detector, the horizontal field of view angle of corresponding second optical system of target image is obtained.
Step S13, according to the pixel number of horizontal direction in the target image, the picture of target image corresponding pixel points
The Pixel Dimensions of element value, the focal length of the first optical system and the first optical system, target image corresponding pixel points after being corrected
Pixel value.
Step S14, according to the pixel value of target image corresponding pixel points after amendment and the pixel value of background image pixels point,
Image after being merged.
In one embodiment of the invention, as shown in Figure 1, before step S11, the fusion method further includes following
Step:
Step S10, reduction resolution conversion is carried out to the target image and background image.
In step slo, reduction resolution conversion is carried out to the target image and background image to reduce image to divide
Resolution can reduce the processing data amount of image, so as to improve system operations speed.So, in step s 11, mesh after converting is obtained
The pixel value of logo image corresponding pixel points and the pixel value of conversion rear backdrop image slices vegetarian refreshments.
In specific implementation, the horizontal field of view angle of corresponding second optical system of the target image is specially：The mesh
The corresponding second optical system angle of half field-of view in the horizontal direction of logo image, i.e. the second optical system mmax/ 2 correspond to horizontal field of view
Angle is ω1。
In specific implementation, the corresponding second optical system angle of half field-of view in the horizontal direction of the target image is by following
Formula determines：
Wherein, yhIt is the size of detector horizontal direction in the second optical system, f1It is the focal length value of the second optical system.
In specific implementation, the pixel value of target image corresponding pixel points is determined by the following formula after the amendment：
Wherein, mi,niIt is the pixel value of i pixels in target image, ω1It is partly regarding for the horizontal direction of light path to be adjusted
, f2It is the focal length value of the first optical system, mmaxIt is the pixel number of the horizontal direction of target image.
The fusion method of the embodiment of the present invention, when to target image and background image additive fusion, to target image
The pixel value of any pixel is modified, according to the pixel value and background image pixels of target image corresponding pixel points after amendment
The pixel value of point carries out image co-registration so that the image of two-way optical system can fit like a glove in non-central visual field, this melts
Conjunction method is simple and calculation amount is small, greatly reduces the requirement to system processing power, in addition in central vision and non-central regards
Field can reach good alignment result, have higher positioning accurate parasexuality.
Fig. 2 is the structure diagram of one embodiment double light path optical system according to the present invention.It is as shown in Fig. 2, of the invention
The optical system of embodiment includes：
Acquisition module 21, for obtaining the pixel value of target image corresponding pixel points and the pixel of background image pixels point
Value；
First generation module 22, for obtaining the focal length and detector size of corresponding first optical system of background image,
And according to the size of the focal length and detector, obtain the horizontal field of view angle of corresponding second optical system of target image；
Second generation module 23, for the pixel number according to horizontal direction in the target image, target image pair
The Pixel Dimensions of the pixel value of pixel, the focal length of the first optical system and the first optical system are answered, target figure after being corrected
As the pixel value of corresponding pixel points；
Fusion Module 24, for according to the pixel value of target image corresponding pixel points after amendment and background image pixels point
Pixel value, the image after being merged.
In specific implementation, as shown in Fig. 2, the optical system further includes：Conversion module 20 and the acquisition module 21
Connect and for carrying out reduction resolution conversion to the target image and background image.By conversion module 20 to the target
Image and background image carry out reduction resolution conversion can reduce the processing data amount of image to reduce the resolution ratio of image, so that
Improve system operations speed.So, acquisition module 21 obtain conversion after target image corresponding pixel points pixel value and conversion after
The pixel value of background image pixels point.
In specific implementation, the horizontal field of view angle of corresponding second optical system of the target image is specially：The mesh
The corresponding second optical system angle of half field-of view in the horizontal direction of logo image, i.e. the second optical system mmax/ 2 correspond to horizontal field of view
Angle is ω1。
In specific implementation, the corresponding second optical system angle of half field-of view in the horizontal direction of the target image is by following
Formula determines：
Wherein, yhIt is the size of detector horizontal direction in the second optical system, f1It is the focal length value of the second optical system.
In specific implementation, the pixel value of target image corresponding pixel points is determined by the following formula after the amendment：
Wherein, mi,niIt is the pixel value of i pixels in target image, ω1It is partly regarding for the horizontal direction of light path to be adjusted
, f2It is the focal length value of the first optical system, mmaxIt is the pixel number of the horizontal direction of target image.
The double light path optical system of the embodiment of the present invention, when to target image and background image additive fusion, to target
The pixel value of any pixel of image is modified, according to the pixel value and Background of target image corresponding pixel points after amendment
Image co-registration is carried out as the pixel value of pixel so that the image of two-way optical system can be kissed completely in non-central visual field
Close, the fusion method is simple and calculation amount is small, greatly reduces the requirement to system processing power, in addition in central vision and non-
Central vision can reach good alignment result, have higher positioning accurate parasexuality.
In specific implementation, which is specially day blind ultraviolet-visible light dual spectra optical system, and day is blind
In ultraviolet-visible light dual spectra optical system, it is seen that digital picture nominal resolution is 752 × 582, and pixel dimension is about 4.85
μm, resolution ratio is 640 × 480 after acquired card conversion, and ultraviolet digital image resolution 752 × 582, Pixel size is 8.6 μm
× 8.3 μm, resolution ratio is 640 × 480 after acquired card conversion.In addition, the VISIBLE LIGHT SYSTEM when visible ray is in different distance
Focal length value f2Changed according to below table：
In specific implementation, m in ultraviolet-camerasmax/ 2 correspondence horizontal field of view angles are ω1, such as ω1=2 °, ultraviolet image electricity
The pixel coordinate of dizzy point of scintillation is (mi,ni), it is seen that image arbitrary point pixel coordinate is (Mi,Ni).It is assumed that picture centre corresponds to picture
Plain coordinate is (0,0), when ultraviolet, visual picture fusion is superimposed, corrects ultraviolet image.F in formula2With Visible Light Camera
Return value constantly changes, and the revised pixel coordinate point of ultraviolet image corona point of scintillation is：
Wherein, mi,niIt is the pixel value of i pixels in target image, ω1It is partly regarding for the horizontal direction of light path to be adjusted
, f2It is the focal length value of the first optical system, mmaxIt is the pixel number of the horizontal direction of target image.I.e. by ultraviolet image
In target point move new pixel coordinate point.New ultraviolet image is subjected to fusion treatment with visible images and is exported.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment of the present invention or example.In the present specification, schematic expression of the above terms is not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
Combined in an appropriate manner in one or more embodiments or example.In addition, without conflicting with each other, the skill of this area
Art personnel can be tied the different embodiments or example described in this specification and different embodiments or exemplary feature
Close and combine.
Although the embodiment of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, those of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (8)
- A kind of 1. image interfusion method of double light path optical system, it is characterised in that：The fusion method comprises the following steps：Obtain the pixel of the target pixel value of horizontal direction and the target horizontal direction in background image in the target image Positional value；Obtain the focal length and detector size of corresponding first optical system of target image, and according to the focal length and detector Size, obtains the horizontal direction angle of half field-of view of system；According to the focal length of the second optical system of the background image detector, the horizontal direction picture of the second optical system detector The size of plain number and the single pixel of detector, the location of pixels of target horizontal direction in the target image after being corrected Value；Target image after amendment target in the horizontal direction location of pixels is merged with background image；The pixel value of target image corresponding pixel points is determined by the following formula after the amendment：<mrow> <msub> <mi>m</mi> <mi>i</mi> </msub> <mo>=</mo> <mfrac> <mrow> <mo>(</mo> <msub> <mi>f</mi> <mn>2</mn> </msub> <mo>&times;</mo> <msub> <mi>tan&omega;</mi> <mn>1</mn> </msub> <mo>)</mo> <mo>/</mo> <msub> <mi>&mu;</mi> <mn>2</mn> </msub> </mrow> <mrow> <msub> <mi>m</mi> <mrow> <mi>m</mi> <mi>a</mi> <mi>x</mi> </mrow> </msub> <mo>/</mo> <mn>2</mn> </mrow> </mfrac> <mo>&times;</mo> <msub> <mi>m</mi> <mi>i</mi> </msub> <mo>,</mo> </mrow>Wherein, miIt is the pixel value of target horizontal direction in the target image, ω1It is the horizontal direction of light path to be adjusted Half field-of-view, f2It is the focal length value of the second optical system, mmaxIt is the pixel number of the horizontal direction of background image；Vertical direction there is also identical relation,<mrow> <msubsup> <mi>n</mi> <mi>i</mi> <mo>&prime;</mo> </msubsup> <mo>=</mo> <mfrac> <mrow> <mo>(</mo> <msub> <mi>f</mi> <mn>2</mn> </msub> <mo>&times;</mo> <msub> <mi>tan&omega;</mi> <mn>1</mn> </msub> <mo>)</mo> <mo>/</mo> <msub> <mi>&mu;</mi> <mn>2</mn> </msub> </mrow> <mrow> <msub> <mi>m</mi> <mrow> <mi>m</mi> <mi>a</mi> <mi>x</mi> </mrow> </msub> <mo>/</mo> <mn>2</mn> </mrow> </mfrac> <mo>&times;</mo> <msub> <mi>n</mi> <mi>i</mi> </msub> <mo>,</mo> </mrow>Wherein, niIt is the pixel value of target vertical direction in the target image, ω1It is the horizontal direction of light path to be adjusted Half field-of-view, f2It is the focal length value of the second optical system, mmaxIt is the pixel number of the horizontal direction of background image.
- 2. image interfusion method as claimed in claim 1, it is characterised in that：The fusion method is further comprising the steps of：Reduction resolution conversion is carried out to the target image and background image.
- 3. image interfusion method as claimed in claim 1, it is characterised in that：Corresponding first optical system of the target image Horizontal field of view angle be specially：The corresponding first optical system angle of half field-of view in the horizontal direction of the target image.
- 4. image interfusion method as claimed in claim 3, it is characterised in that：Corresponding first optical system of the target image Angle of half field-of view in the horizontal direction is determined by the following formula：<mrow> <msub> <mi>&omega;</mi> <mn>1</mn> </msub> <mo>=</mo> <mi>a</mi> <mi>r</mi> <mi>c</mi> <mi>t</mi> <mi>a</mi> <mi>n</mi> <mrow> <mo>(</mo> <mfrac> <msub> <mi>y</mi> <mi>h</mi> </msub> <mrow> <mn>2</mn> <mo>&times;</mo> <msub> <mi>f</mi> <mn>1</mn> </msub> </mrow> </mfrac> <mo>)</mo> </mrow> <mo>,</mo> </mrow>Wherein, yhIt is the size of detector horizontal direction in the first optical system, f1It is the focal length value of the second optical system.
- A kind of 5. double light path optical system, it is characterised in that：The optical system includes：Acquisition module, for obtaining the target pixel value of horizontal direction and the level side in background image in the target image To pixel value；First generation module, for obtaining the focal length and detector size of corresponding first optical system of background image, and according to The size of the focal length and detector, obtains the horizontal direction angle of half field-of view of system；Second generation module, for the pixel number according to the background image detector horizontal direction, the second optical system Focal length and the second optical system Pixel Dimensions, the corresponding horizontal direction pixel value of target image after being corrected；Fusion Module, target image and background image for the pixel value in the horizontal direction of target after amendment are melted Close；Target is determined in the pixel value of target image horizontal direction by the following formula after the amendment：Wherein, miIt is the pixel value of target horizontal direction in the target image, ω1It is the horizontal direction of light path to be adjusted Half field-of-view, f2It is the focal length value of the second optical system, mmaxIt is the pixel number of the horizontal direction of background image,Vertical direction there is also identical relation,<mrow> <msubsup> <mi>n</mi> <mi>i</mi> <mo>&prime;</mo> </msubsup> <mo>=</mo> <mfrac> <mrow> <mo>(</mo> <msub> <mi>f</mi> <mn>2</mn> </msub> <mo>&times;</mo> <msub> <mi>tan&omega;</mi> <mn>1</mn> </msub> <mo>)</mo> <mo>/</mo> <msub> <mi>&mu;</mi> <mn>2</mn> </msub> </mrow> <mrow> <msub> <mi>m</mi> <mrow> <mi>m</mi> <mi>a</mi> <mi>x</mi> </mrow> </msub> <mo>/</mo> <mn>2</mn> </mrow> </mfrac> <mo>&times;</mo> <msub> <mi>n</mi> <mi>i</mi> </msub> <mo>,</mo> </mrow>Wherein, niIt is the pixel value of target vertical direction in the target image, ω1It is the horizontal direction of light path to be adjusted Half field-of-view, f2It is the focal length value of the second optical system, mmaxIt is the pixel number of the horizontal direction of background image.
- 6. double light path optical system as claimed in claim 5, it is characterised in that：The optical system further includes：Conversion module It is electrically connected with the acquisition module, and for carrying out reduction resolution conversion to the target image and background image.
- 7. double light path optical system as claimed in claim 5, it is characterised in that：Corresponding first optical system of the target image The horizontal field of view angle of system is specially：The corresponding first optical system angle of half field-of view in the horizontal direction of the target image.
- 8. double light path optical system as claimed in claim 7, it is characterised in that：Corresponding first optical system of the target image Angle of half field-of view in the horizontal direction of uniting is determined by the following formula：<mrow> <msub> <mi>&omega;</mi> <mn>1</mn> </msub> <mo>=</mo> <mi>a</mi> <mi>r</mi> <mi>c</mi> <mi>t</mi> <mi>a</mi> <mi>n</mi> <mrow> <mo>(</mo> <mfrac> <msub> <mi>y</mi> <mi>h</mi> </msub> <mrow> <mn>2</mn> <mo>&times;</mo> <msub> <mi>f</mi> <mn>1</mn> </msub> </mrow> </mfrac> <mo>)</mo> </mrow> <mo>,</mo> </mrow>Wherein, yhIt is the size of detector horizontal direction in the first optical system, f1It is the focal length value of the first optical system.
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| US6816627B2 (en) * | 2001-04-12 | 2004-11-09 | Lockheed Martin Corporation | System for morphological image fusion and change detection |
| CN1545064A (en) * | 2003-11-27 | 2004-11-10 | 上海交通大学 | Infrared and visible light image fusion method |
| CN1932882A (en) * | 2006-10-19 | 2007-03-21 | 上海交通大学 | Infared and visible light sequential image feature level fusing method based on target detection |
| CN102075679A (en) * | 2010-11-18 | 2011-05-25 | 无锡中星微电子有限公司 | Method and device for acquiring image |
| CN104182950A (en) * | 2013-05-22 | 2014-12-03 | 浙江大华技术股份有限公司 | Image processing method and device thereof |
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| US6816627B2 (en) * | 2001-04-12 | 2004-11-09 | Lockheed Martin Corporation | System for morphological image fusion and change detection |
| CN1545064A (en) * | 2003-11-27 | 2004-11-10 | 上海交通大学 | Infrared and visible light image fusion method |
| CN1932882A (en) * | 2006-10-19 | 2007-03-21 | 上海交通大学 | Infared and visible light sequential image feature level fusing method based on target detection |
| CN102075679A (en) * | 2010-11-18 | 2011-05-25 | 无锡中星微电子有限公司 | Method and device for acquiring image |
| CN104182950A (en) * | 2013-05-22 | 2014-12-03 | 浙江大华技术股份有限公司 | Image processing method and device thereof |
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