CN109767389A - Adaptive weighted dual-norm remote sensing image blind super-resolution reconstruction method based on local and non-local joint priors - Google Patents
Adaptive weighted dual-norm remote sensing image blind super-resolution reconstruction method based on local and non-local joint priors Download PDFInfo
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Abstract
本发明公开了一种基于局部和非局部联合先验的自适应加权双范数遥感图像盲超分辨重建方法。主要包括以下步骤：在模糊核估计子过程使用自适应加权双范数先验，以得到估计的模糊核和初始高分辨率图像；将估计的模糊核和初始高分辨率图像作为非盲重建子过程的输入；在非盲重建子过程，估计的模糊核和初始高分辨率图像作为已知条件，利用局部和非局部的联合先验及最大后验概率重建模型估计出高分辨率图像。以重建结果作为新的输入高分辨率图像，重复执行以上两个步骤直到达到最大重建次数，最后输出即为最终重建结果。本发明所述方法可以在模糊核未知的条件下由低分辨率图像重建高质量的高分辨率图像，重建的遥感图像可应用于军事、农业和民生等领域。
The invention discloses a blind super-resolution reconstruction method of self-adaptive weighted dual-norm remote sensing images based on local and non-local joint priors. It mainly includes the following steps: use adaptive weighted dual-norm prior in the blur kernel estimation sub-process to obtain the estimated blur kernel and the initial high-resolution image; use the estimated blur kernel and the initial high-resolution image as the non-blind reconstruction sub-process The input of the process; in the non-blind reconstruction sub-process, the estimated blur kernel and the initial high-resolution image are used as known conditions, and the high-resolution image is estimated using the local and non-local joint prior and maximum posterior probability reconstruction model. Taking the reconstruction result as a new input high-resolution image, the above two steps are repeated until the maximum reconstruction times are reached, and the final output is the final reconstruction result. The method of the invention can reconstruct a high-quality high-resolution image from a low-resolution image under the condition of unknown fuzzy kernel, and the reconstructed remote sensing image can be applied to the fields of military, agriculture and people's livelihood.
Description
Technical field
The present invention relates to image resolution ratio lift techniques, and in particular to it is a kind of based on it is local and it is non local joint priori from
It adapts to weight the blind super-resolution reconstruction method of double norm remote sensing images, belongs to field of image processing.
Background technique
High-resolution remote sensing images are widely used in the fields such as military affairs, agricultural, the people's livelihood.However, remote sensing images
Acquisition be easy the influence for being vibrated and moving, cause blur degradation, therefore the quality of remote sensing images may be not fully up to expectations.
Under normal conditions, image deterioration includes fuzzy and down-sampling.Therefore, in practical applications, it is directed to by image processing techniques
The quality for promoting to property the remote sensing images obtained, is necessary.In order to solve these problems, people are to image deblurring
It is conducted extensive research with increase resolution.This problem is studied herein, referred to as rebuilding blind super-resolution.Single width
Image super-resolution rebuilding technology be promoted image resolution ratio one of method, have be easily achieved, be at low cost, strong applicability
The features such as, it estimates corresponding high-definition picture by the single width low-resolution image observed.Due to same low-resolution image
Multiple and different high-definition pictures may be corresponded to, single image super-resolution rebuilding problem has serious pathosis.Therefore
It needs to constrain by image prior to obtain a stabilization, the estimation of reliable high-resolution.Current single image super-resolution
Method for reconstructing can substantially be divided into three classes: the super-resolution method based on interpolation, the super-resolution method based on reconstruction and be based on
The super-resolution method of study.These three types of methods have the characteristics that different, and such as the method based on interpolation is usually according only to interpolation kernel
Obtain interpolation image, less to consider fuzzy and noise influence, application range is relatively limited.Super-resolution based on reconstruction
Method sufficiently excavates the information of degraded image itself, usually can preferably inhibit artificial trace.Method based on study often has
Have it is faster execute speed, and can restoring image detail well.In addition, carrying out Super-resolution reconstruction under unknown fuzzy core
Build is that image restores the bigger challenge faced, as rebuilding blind super-resolution.Rebuilding blind super-resolution is generally divided into mould
Paste two subprocess of kernel estimates and non-rebuilding blind super-resolution.
Summary of the invention
The purpose of the present invention is organically combining two subprocess of fuzzy kernel estimates and non-blind super-resolution, and then construct
A kind of high efficiency, the blind method for reconstructing of high performance Remote Sensing Image Super Resolution.
Adaptive weighted double blind oversubscription of norm remote sensing images proposed by the present invention based on local and non local joint priori
It distinguishes method for reconstructing, mainly includes following operating procedure:
(1) in fuzzy kernel estimates subprocess, using adaptive weighted double norm priori, with the fuzzy core estimated and just
Beginning high-definition picture；
(2) using the fuzzy core of estimation and initial high-resolution image as the non-blind input for rebuilding subprocess；
(3) in non-blind reconstruction subprocess, the fuzzy core and initial high-resolution image of estimation utilize office as known conditions
Portion and non local joint priori and maximum a posteriori probability reconstruction model estimate high-definition picture.
(4) using the reconstructed results of step (3) as new input high-definition picture, step (3) and step are repeated
(4), number is built until reaching maximum, finally output is final reconstructed results.
Detailed description of the invention
Fig. 1 is that the present invention is based on adaptive weighted double blind super-resolution of norm remote sensing images of local and non local joint priori
The functional block diagram of method for reconstructing
Fig. 2 is initial high-resolution image and bicubic reconstruction image comparison diagram: where (a) (c) is fuzzy nuclear processes
Two times of reconstruction initial high-resolution images are obtained, (b) (d) is the result rebuild using two times of bicubic
Fig. 3 is the present invention and other methods fuzzy core estimated result comparison diagram: where (a) (e) (i) is realistic blur core
Image, (b) (f) (j) is the fuzzy core that the present invention estimates, (c) (g) (k) is the fuzzy core that deblurring control methods 1 is estimated, (d)
(h) (l) is the fuzzy core that deblurring control methods 2 is estimated
Fig. 4 is comparison diagram of the present invention with six kinds of methods to test image " mobilehomepark " two times of reconstructed results:
Wherein, (a) is input low-resolution image, (i) is original high-resolution image, and (b) (c) (d) (e) (f) (g) (h) is respectively
Control methods 1, control methods 2, control methods 3, control methods 4, control methods 5, Bicubic and reconstructed results of the invention
Specific embodiment
The present invention will be further explained below with reference to the attached drawings:
In Fig. 1, adaptive weighted double blind Super-resolution Reconstructions of norm remote sensing images based on local and non local joint priori
Method can specifically be divided into following steps:
(1) in fuzzy kernel estimates subprocess, using adaptive weighted double norm priori, with the fuzzy core estimated and just
Beginning high-definition picture；
(2) using the fuzzy core of estimation and initial high-resolution image as the non-blind input for rebuilding subprocess；
(3) in non-blind reconstruction subprocess, the fuzzy core and initial high-resolution image of estimation utilize office as known conditions
Portion and non local joint priori and maximum a posteriori probability reconstruction model estimate high-definition picture.
(4) using the reconstructed results of step (3) as new input high-definition picture, step (3) and step are repeated
(4), number is built until reaching maximum, finally output is final reconstructed results.
Specifically, in the step (1), we input low resolution blurred picture first, and building is general based on maximum a posteriori
The reconstruction framework of rate, using adaptive weighted double norm priori and convolution consistency priori as constraint condition in the frame,
In the fuzzy core of adaptive weighted double norm priori difference restrained split-flows and the high-definition picture of estimation, convolution consistency priori
The high-definition picture of restrained split-flow.As shown in formula (1):
λ indicates the parameter of first item de-blurred image convolution output；H is that the matrix of fuzzy core k indicates；D is that reduction is original
The down-sampling matrix of high-definition picture resolution ratio；X is original high-resolution image, and y is the low resolution fuzzy graph observed
Picture；αx, βx, αk, βkIt is regularization parameter；η is convolution consistency constraint parameter；It is convolution consistency constraint item, uses
In reduction pathosis, high-definition pictureIt can rebuild to obtain by existing super-resolution algorithms；By lpNorm and l2Norm building
Image prior itemWith fuzzy core priori itemAdaptive double norm weightings are collectively constituted
Priori, wherein weighting matrix W is for adaptively determining that image current region is non-edge or fringe region, and weighs according to this
L is emphasized again2Norm is for the smooth and noise suppressed effect of image non-edge and lpSharpening of the norm to fringe region
It acts on, wherein each w in WiIt is defined as formula (2):
It represents the local Non-smooth surface of a 5*5 image block centered on ith pixel.XiIt is the image block
Center pixel, ΩiIt is all pixels indexed set, X in the image blockijIt is XiNeighbor pixel in the position j.
By step (1), the fuzzy core k and initial high-resolution image x that can be estimated.
In the step (2), we rebuild high-definition picture by the non-blind reconstruction subprocess of super-resolution.Wherein in step
Suddenly the fuzzy core k and initial high-resolution image x of estimation obtained in (1) are as known input item, thus by former and later two
Subprocess combines, such as Fig. 1.
In the step (3), we construct the reconstruction framework based on maximum a posteriori probability, local and non local using joint
Priori as image prior, see formula (3):
Wherein JAHNLTVIt is non local image prior, JAGDIt is local image prior, ζ and θ are the above-mentioned two elder generations of balance
The regularization parameter tested.In this step, fuzzy core is known and initial high-resolution image is as iteration starting point, to reconstruct
High-definition picture.
In the step (4), we repeat step using the result of step (3) as new initial high-resolution image
Suddenly (3) and step (4).Number is rebuild until reaching the maximum of setting, reconstructed results are final output.
Validity in order to better illustrate the present invention has carried out initial high-resolution image comparative experiments respectively, obscures
Kernel estimates comparative experiments, and carried out on common test image " mobilehomepark " reconstruction of final high-definition picture
Comparative experiments.
Initial high-resolution image comparative experiments is as shown in Figure 2.Fig. 2 (a) and Fig. 2 (c) is by the fuzzy kernel estimates of the present invention
2 times of subprocess are rebuild obtained initial high-resolution image, and Fig. 2 (b) and Fig. 2 (d) are used to the low resolution of raw observation
The high-definition picture of 2 times of bicubic reconstructions.
Fuzzy kernel estimates comparative experiments is as shown in Figure 3.(a) (e) (i) is realistic blur core image, and (b) (f) (j) is this hair
The fuzzy core of bright estimation, (c) (g) (k) is the fuzzy core that deblurring control methods 1 is estimated, (d) (h) (l) is deblurring to analogy
The fuzzy core that method 2 is estimated.The algorithm of two kinds of comparisons are as follows:
The method that deblurring control methods 1:Xu et al. is proposed, bibliography " Xu L, Zheng S, Jia J.
“Unnatural l0 sparse representation for natural image deblurring,”Proceedings
of the IEEE conference on computer vision and pattern recognition.2013:1107-
1114.”。
The method that deblurring control methods 2:Shao et al. is proposed, bibliography " Shao W Z, Li H B, Elad M,
“Bi-l0-l2-norm regularization for blind motion deblurring,”Journal ofVisual
Communication and Image Representation,2015,33:42-59.”。
The reconstruction comparative experiments of final high-definition picture is as shown in Figure 4.(a) it is input low-resolution image, is (i) original
Beginning high-definition picture, (b) (c) (d) (e) (f) (g) (h) is respectively control methods 1, control methods 2, control methods 3, comparison
Method 4, control methods 5, Bicubic and reconstructed results of the invention.
The method that control methods 1:Shao et al. is proposed, bibliography " Shao W Z, Elad M, " Simple,
accurate,and robust nonparametric blind super-resolution,”International
Conference on Image and Graphics.Springer,Cham,2015:333-348.”。
Control methods 2: fuzzy kernel estimates subprocess uses deblurring control methods 2, non-blind reconstruction subprocess: Buades etc.
The method that people proposes, bibliography " Buades A, Coll B, Morel J M, " Image enhancement by non-
local reverse heat equation,”Preprint CMLA,2006,22:2006.”。
Control methods 3: fuzzy kernel estimates subprocess uses deblurring control methods 2, non-blind reconstruction subprocess: Ren et al.
The method of proposition, bibliography " Ren C, He X, Nguyen T Q, " Single image super-resolution via
adaptive high-dimensional non-local total variation and adaptive geometric
feature,”IEEE Transactions on Image Processing,2017,26(1):90-106.”。
Control methods 4: fuzzy kernel estimates subprocess uses deblurring control methods 1, non-blind reconstruction subprocess: Dong et al.
The method of proposition, bibliography " Dong W, Zhang L, Shi G, et al, " Nonlocally centralized sparse
representation for image restoration,”IEEE Transactions on Image Processing,
2013,22(4):1620-1630.”。
Control methods 5: fuzzy kernel estimates subprocess uses deblurring control methods 1, non-blind reconstruction subprocess: Buades etc.
The method that people proposes, bibliography " Buades A, Coll B, Morel J M, " Image enhancement by non-
local reverse heat equation,”Preprint CMLA,2006,22:2006.”。
The content of the reconstruction comparative experiments of final high-definition picture is as follows:
Bicubic is used respectively, and method 1, method 2, method 3, method 4, method 5 and the present invention are to by remote sensing test image
The low resolution blurred picture that library " UCMerced " simulation generates carries out 2 times of reconstructions.The fuzzy of low-resolution image degrades by eight
Kind fuzzy core is realized.Super-resolution rebuilding result to objectively evaluate parameter as shown in Table 1.Wherein objectively evaluate parameter PSNR
(Peak Signal to Noise Ratio), SSIM (Structure Similarity Index) are that value is bigger, are represented
Picture quality is better.Test of heuristics platform: the desk-top calculating of processor Inter Core i5CPU (3.3GHz) and memory 16G
Machine.
Table one
In the objective parameter shown in the table one, for eight kinds of different fuzzy cores present invention on remote sensing images test library
Highest PSNR, SSIM value is all achieved, the better quality of reconstructed results of the present invention is represent.
In conclusion reconstructed results of the invention have some superiority on subjective evaluation compared to control methods.Cause
This, the present invention is a kind of high performance single image super resolution ratio reconstruction method.
Claims (4)
1. special based on adaptive weighted double blind super-resolution reconstruction methods of norm remote sensing images of local and non local joint priori
Sign be the following steps are included:
Step 1: in fuzzy kernel estimates subprocess, using adaptive weighted double norm priori, with the fuzzy core estimated and just
Beginning high-definition picture；
Step 2: using the fuzzy core of estimation and initial high-resolution image as the non-blind input for rebuilding subprocess；
Step 3: in non-blind reconstruction subprocess, the fuzzy core and initial high-resolution image of estimation utilize office as known conditions
Portion and non local joint priori and maximum a posteriori probability reconstruction model estimate high-definition picture；
Step 4: using the reconstructed results of step 3 as new input high-definition picture, repeating step 3 and step 4,
Number is built until reaching maximum, finally output is final reconstructed results.
2. adaptive weighted double norm remote sensing images according to claim 1 based on local and non local joint priori are blind
Super-resolution reconstruction method, it is characterised in that adaptive weighted double norm priori described in step 1.
3. adaptive weighted double norm remote sensing images according to claim 1 based on local and non local joint priori are blind
Super-resolution reconstruction method, it is characterised in that part and non local joint described in step 3 based on initial high-resolution image
Priori.
4. adaptive weighted double norm remote sensing images based on local and non local joint priori described in -4 according to claim 1
Blind super-resolution reconstruction method, feature are being that fuzzy kernel estimates subprocess and super-resolution are combined using initial high-resolution image
The non-blind complete frame for rebuilding subprocess.
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