CN103824289A - Template-based array image registration method in snapshot spectral imaging - Google Patents
Template-based array image registration method in snapshot spectral imaging Download PDFInfo
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- CN103824289A CN103824289A CN201410052688.8A CN201410052688A CN103824289A CN 103824289 A CN103824289 A CN 103824289A CN 201410052688 A CN201410052688 A CN 201410052688A CN 103824289 A CN103824289 A CN 103824289A
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Abstract
The invention belongs to the spectral imaging technical field and relates to a template-based array image registration method in snapshot spectral imaging, and particularly relates to an image fast registration method. The method includes the following steps that: an imaging system with a lens array adopted as a core images a predetermined template, and template sub images which are corresponding to each of sub lenses are extracted; with a template sub image corresponding to a sub lens located at the center of the lens array adopted as a reference image, all the other template sub images are calibrated, and calibration data are obtained; affine transformation is performed on all the template sub images with respect to the reference image, and affine transform parameters are adopted as a registration parameter matrix of the system; the imaging system with the lens array adopted as the core images a target, and target sub images which are corresponding to each of the sub lenses and are acquired by a CCD are extracted; the registration parameter matrix is utilized to perform one-to-one transformation on the target sub images, such that registered target sub images can be obtained; and a target spectral data cube can be obtained through calculation by using the registered target sub images. With the method of invention adopted, not only can registration speed can be improved, but also registration accuracy can be improved.
Description
Technical field
Array image method for registering based on template in snapshot light spectrum image-forming belongs to a light spectrum image-forming technical field, is specifically related to a kind of Rapid Image Registration method.
Background technology
Interference imaging is one of important means obtaining target optical spectrum.Snapshot formula inteference imaging spectrometer makes form that interference imaging can obstructed overscanning just can directly obtain the 3-D data set of target by introducing lens arra, reduces greatly acquisition time.
In snapshot formula inteference imaging spectrometer, the image of scioptics array collection is because lens production process exists defect, the reasons such as imaging optical path is inhomogeneous, the subgraph array obtaining more or less exists some skews, the subgraph that is shone into zones of different by reasons such as camera lens spherical aberrations produces some equivalent displacements, deflection, distortion etc., this makes in the time extracting the interferogram of corresponding point in subgraph, due to the pixel of same coordinate in each subgraph might not corresponding object same point, just there is deviation in the interferogram extracting like this, can reduce significantly the precision of spectrometer.
Can make the point of the target that the point of the same coordinate of each subgraph is corresponding as far as possible near even overlapping by effective registration means, the interferogram precision of the each point putting forward like this will improve greatly.But traditional registration means are passed through with respect to subgraph registration between two, and not only calculated amount is very large, and registration is long operation time, has limited the registration speed of image; And for different images, due to the diversity of specifying information, make precision be difficult to improve.
Summary of the invention
In order to improve image registration speed, the present invention has designed a kind of array image method for registering based on template, and this method for registering not only can improve registration speed, and can improve registration accuracy.
The object of the present invention is achieved like this:
An array image method for registering based on template in snapshot light spectrum image-forming, comprises the following steps:
A, imaging system take lens arra as core are carried out imaging to pre-solid plate, extract template subgraph corresponding to each sub-lens that CCD gathers;
B, using template subgraph corresponding to the sub-lens in lens arra center as with reference to figure, demarcate other all template subgraphs except reference diagram, obtain nominal data;
C, the nominal data obtaining according to step b, do affined transformation by all template subgraphs with respect to reference diagram, the registration parameter matrix using affine transformation parameter as system;
D, imaging system take lens arra as core are carried out imaging to target, extract target subgraph corresponding to each sub-lens that CCD gathers;
E, utilize the target subgraph that registration parameter matrix that step c obtains obtains steps d to convert one to one, obtain the target subgraph after registration;
F, utilize the target subgraph after the registration that step e obtains to calculate target optical spectrum data cube.
Array image method for registering based on template in above-mentioned snapshot light spectrum image-forming, the pre-solid plate described in step a, at the bottom of thering is fast black base, white mesh lines and for encode ± 45 ° of oblique line sections.
Array image method for registering based on template in above-mentioned snapshot light spectrum image-forming, the nominal data described in step b is the position data of feature grid point, other net point and mesh lines after the pre-solid plate coding described in step a.
Array image method for registering based on template in above-mentioned snapshot light spectrum image-forming, the registration parameter matrix described in step c repeats to call.
Array image method for registering based on template in above-mentioned snapshot light spectrum image-forming, step c is specially: the nominal data obtaining according to step b, net point in all template subgraphs is done to affined transformation with respect to the net point of reference diagram, the registration parameter matrix using transform data as system.
Array image method for registering based on template in above-mentioned snapshot light spectrum image-forming, the rule of conversion one to one described in step e is the template subgraph of one of them sub-lens imaging in lens arra to be acted on to the target subgraph of this sub-lens imaging with respect to the affine transformation parameter of reference diagram.
Beneficial effect:
1, registration template can be according to different applicable cases particular design, by first to template but not directly target is carried out to registration, and in advance the registration parameter matrix stores of template is got up, and with this parameter matrix directly to gather target image be out of shape, greatly reduce the time of registration, the loaded down with trivial details registration process simultaneously having omitted to complex target.
2, adopt template registration simultaneously, obtained registration parameter more convenient and more accurate, can effectively improve the precision of registration.
Accompanying drawing explanation
Fig. 1 is the array image method for registering process flow diagram based on template in snapshot light spectrum image-forming of the present invention.
Fig. 2 is pre-solid plate schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the invention is described in further detail.
Array image method for registering based on template in the snapshot light spectrum image-forming of the present embodiment, as shown in Figure 1, the method comprises the following steps process flow diagram:
A, imaging system take lens arra as core are carried out imaging to pre-solid plate, extract template subgraph corresponding to each sub-lens that CCD gathers;
Described pre-solid plate, at the bottom of thering is fast black base, white mesh lines and for encode ± 45 ° of oblique line sections, the schematic diagram of pre-solid plate is as shown in Figure 2;
B, using template subgraph corresponding to the sub-lens in lens arra center as with reference to figure, demarcate other all template subgraphs except reference diagram, obtain nominal data;
Described nominal data is the position data of feature grid point, other net point and mesh lines after the pre-solid plate coding described in step a;
C, the nominal data obtaining according to step b, do affined transformation by all template subgraphs with respect to reference diagram, the registration parameter matrix using affine transformation parameter as system;
Described registration parameter matrix can repeat to call;
Step c is specially: the nominal data obtaining according to step b, the net point in all template subgraphs is done to affined transformation with respect to the net point of reference diagram, the registration parameter matrix using transform data as system;
D, imaging system take lens arra as core are carried out imaging to target, extract target subgraph corresponding to each sub-lens that CCD gathers;
E, utilize the target subgraph that registration parameter matrix that step c obtains obtains steps d to convert one to one, obtain the target subgraph after registration;
The described rule of conversion is one to one the template subgraph of one of them sub-lens imaging in lens arra to be acted on to the target subgraph of this sub-lens imaging with respect to the affine transformation parameter of reference diagram.
The present invention is not limited to above-mentioned preferred forms, and anyone should learn structural change or the method improvement of under enlightenment of the present invention, making, and every have identical or close technical scheme with the present invention, within all falling into protection scope of the present invention.
Claims (6)
1. the array image method for registering based on template in snapshot light spectrum image-forming, is characterized in that, comprises the following steps:
A, imaging system take lens arra as core are carried out imaging to pre-solid plate, extract template subgraph corresponding to each sub-lens that CCD gathers;
B, using template subgraph corresponding to the sub-lens in lens arra center as with reference to figure, demarcate other all template subgraphs except reference diagram, obtain nominal data;
C, the nominal data obtaining according to step b, do affined transformation by all template subgraphs with respect to reference diagram, the registration parameter matrix using affine transformation parameter as system;
D, imaging system take lens arra as core are carried out imaging to target, extract target subgraph corresponding to each sub-lens that CCD gathers;
E, utilize the target subgraph that registration parameter matrix that step c obtains obtains steps d to convert one to one, obtain the target subgraph after registration;
F, utilize the target subgraph after the registration that step e obtains to calculate target optical spectrum data cube.
2. the array image method for registering based on template in snapshot light spectrum image-forming according to claim 1, is characterized in that, the pre-solid plate described in step a, at the bottom of thering is fast black base, white mesh lines and for encode ± 45 ° of oblique line sections.
3. the array image method for registering based on template in snapshot light spectrum image-forming according to claim 1, it is characterized in that, the nominal data described in step b is the position data of feature grid point, other net point and mesh lines after the pre-solid plate coding described in step a.
4. the array image method for registering based on template in snapshot light spectrum image-forming according to claim 1, is characterized in that, the registration parameter matrix described in step c repeats to call.
5. the array image method for registering based on template in snapshot light spectrum image-forming according to claim 1, it is characterized in that, step c is specially: the nominal data obtaining according to step b, net point in all template subgraphs is done to affined transformation with respect to the net point of reference diagram, the registration parameter matrix using transform data as system.
6. the array image method for registering based on template in snapshot light spectrum image-forming according to claim 1, it is characterized in that, the rule of conversion one to one described in step e is the template subgraph of one of them sub-lens imaging in lens arra to be acted on to the target subgraph of this sub-lens imaging with respect to the affine transformation parameter of reference diagram.
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