WO2016106951A1 - 一种方向自适应图像去模糊方法 - Google Patents
一种方向自适应图像去模糊方法 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 230000003044 adaptive effect Effects 0.000 claims description 14
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- 230000010287 polarization Effects 0.000 claims 1
- 238000004422 calculation algorithm Methods 0.000 abstract description 24
- 230000000694 effects Effects 0.000 description 8
- 238000012937 correction Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 210000004185 liver Anatomy 0.000 description 2
- 238000010606 normalization Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000002939 conjugate gradient method Methods 0.000 description 1
- 238000003702 image correction Methods 0.000 description 1
- 238000003331 infrared imaging Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T5/00—Image enhancement or restoration
- G06T5/73—Deblurring; Sharpening
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T5/00—Image enhancement or restoration
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/20—Special algorithmic details
- G06T2207/20004—Adaptive image processing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/20—Special algorithmic details
- G06T2207/20004—Adaptive image processing
- G06T2207/20012—Locally adaptive
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/20—Special algorithmic details
- G06T2207/20048—Transform domain processing
- G06T2207/20056—Discrete and fast Fourier transform, [DFT, FFT]
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- the invention belongs to the field of aerospace and image processing crossover technology, and more particularly to a directional adaptive image deblurring method, which is mainly suitable for deblurring a remote sensing image.
- Space targets such as a large number of communication satellites and resource satellites launched at home and abroad can be used in applications such as network communication, aerial photography, and geodetic survey. Due to the limitation of camera spatial resolution, random noise, and the interference of atmospheric turbulence on the long-distance optical imaging system, the image acquired by the sensor is prone to ambiguity of the target, which brings huge impact on the later target positioning and target classification. The difficulty, therefore. How to effectively improve the image quality of such images has become the focus of research at home and abroad. Domestic and foreign scholars have carried out detailed research on the target deblurring algorithm under such imaging conditions, and have achieved relevant results.
- the present invention provides a directional adaptive image correction method, which quickly and effectively solves the problem of blurring of a long-distance imaging image, and the algorithm has small calculation amount and good adaptability.
- the present invention provides a directional adaptive image deblurring method comprising the following steps:
- Step (1) Define the direction adaptive TV regularized image deblurring to minimize the cost function:
- u is the restored image
- H is the point spread function
- f is the degraded image
- ⁇ >0 is the regularization parameter
- Direction vector For the gradient operator the symbol ⁇ is a vector dot product operator, The symbol ⁇ > is an inner product operator and the log is a logarithmic function; Representing the minimum value for the energy functional ⁇ 1, Hu-f log(Hu)>, and taking the u corresponding to the minimum value as the output;
- Step (3) Introduce a penalty term to split the constrained problem in step (2) into a new minimized cost function:
- Step (4) Convert the minimization problem in step (3) into an alternating minimum solution problem of u, d 1 , d 2 , d 3 with respect to the variable, that is, the other variables are fixedly solved for one of the variables, and the alternating minimum iterative strategy is used. Iteratively solves the above minimum solution problem and obtains the deblurred image.
- the present invention has the following advantages:
- the method of the present invention is capable of recovering against complex blur types or having rich texture images.
- FIG. 1 is a flowchart of a direction adaptive image deblurring method according to the present invention
- Figure 2 (d) is a clear image of the house in the embodiment of the present invention.
- Figure 3 (a) is an image obtained by adding Gaussian blur and Poisson noise with a size of 15 * 15 and a standard deviation of 1.8 to Figure 2 (a), the PSNR of which is 14.97;
- Figure 3 (b) is an image after adding a blur of 3 disc and Poisson noise degradation to Figure 2 (b), the PSNR is 21.88;
- Figure 3 (c) is an image obtained by adding uniform blur and Poisson noise of size 7 * 7 to Figure 2 (c), the PSNR is 22.22;
- Fig. 3(d) is a diagram of adding random blur and Poisson noise degraded by 7*7 to Fig. 2(d) Like, its PSNR is 23.29;
- each scheme has its own algorithm features.
- the algorithm only uses some large-scale statistical prior features of the image to derive the statistical optimal solution or approximate optimal solution of the problem, without considering the small-scale geometric structure inherent in the image itself, such as the edge direction of the image.
- the texture direction or the like is used to constrain the correction result. Therefore, for such a method that relies only on the large-scale statistical prior of the image, the correction result is usually prone to boundary blur and loss of detail at the edge of the image.
- FIG. 1 is a flowchart of an algorithm of the present invention.
- the present invention provides a directional adaptive image deblurring method, including the following steps:
- Step (1) defining a new direction adaptive total variation (TV) regularized image deblurring minimization cost function
- f is the degraded image
- H is the linear operator, representing the point spread function that blurs the image
- u is the clear image that is potentially recovering
- n is the imaging noise.
- the task of image non-blind deconvolution is to obtain a sharp image u from the known degraded image f and the point spread function H.
- the inverse process of image restoration is ill-conditioned, and the noise is amplified during the recovery process, making the image deblurring result unstable. Since the TV regularization method has a good advantage in restoring image details, the present invention uses TV regular terms to overcome the morbidity of image restoration.
- the local edge information of the image is incorporated into the Maximum a posteriori MAP algorithm framework, and a direction-adaptive image deblurring method is obtained, so that the edge of the restored image can be better protected.
- the directional adaptive TV regularization cost function introduced by the present invention is defined as:
- u is the restored image
- H is the point spread function
- f is the degraded image
- ⁇ >0 is the regularization parameter
- the direction adaptive TV regularization cost function can be expanded to:
- Step (3) Introduce a penalty term to split the constrained problem in step (2) into a new minimized cost function:
- Step (4) Use the alternating minimum iteration strategy to convert the minimization problem in step (3) into an alternating minimum solution problem with respect to the variables u, d 1 , d 2 , d 3 .
- the other variables are fixed to solve one of the variables.
- FFT represents the fast Fourier transform
- FFT -1 represents the inverse of the fast Fourier transform
- real represents the real part of the complex number.
- H T represents the conjugate operator of H
- superscript k represents the kth iteration.
- tan -1 is the arctangent function
- ⁇ is the pi
- w is an integer greater than 1
- ⁇ w is the sum of the values in the neighborhood of w ⁇ w centered at the current point
- sum(f) represents the sum of the gray values of the image
- the method of the present invention assumes that the point spread function of the image is known, and takes the maximum number of iterations 100 times, taking the largest peak SNR (Peak Signal to Noise Ratio) PSNR image corresponding to the final image output as a clear, PSNR is calculated image u k output k-th iteration is as follows:
- I represents a clear reference image
- max(I) represents the grayscale maximum of the image I.
- FIG. 2(a) is a clear circuit image in the embodiment of the present invention
- FIG. 2(b) is a clear Cameraman image in the embodiment of the present invention
- FIG. 2(c) is a clear CT image of the liver in the embodiment of the present invention
- Figure 2 (d) is a clear image of the house in the embodiment of the present invention
- Figure 3 (a) is an image obtained by adding Gaussian blur and Poisson noise with a size of 15 * 15 and a standard deviation of 1.8 to Figure 2 (a), the PSNR of which is 14.97;
- Fig. 3(b) is a diagram showing the addition of a disc with a radius of 3 to the blur and Poisson noise degradation of Fig. 2(b) Like, its PSNR is 21.88;
- Figure 3 (c) is an image obtained by adding uniform blur and Poisson noise of size 7 * 7 to Figure 2 (c), the PSNR is 22.22;
- Fig. 3(d) is an image obtained by adding random blur and Poisson noise of size 7*7 to Fig. 2(d), and its PSNR is 23.29; in the present invention, the random fuzzy point spread function used is specifically:
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Abstract
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Claims (10)
- 一种方向自适应图像去模糊方法,其特征在于,所述方法包括如下步骤:步骤(1):定义方向自适应总变分(Total Variation)TV正则化图像去模糊最小化代价函数:其中,u为复原图像,H为点扩展函数,f为退化图像,λ>0为正则化参数;符号表示向量的l1-范数;为方向矢量;步骤(3):引入惩罚项将步骤(2)中的有约束问题分裂为新的最小化代价函数:其中,α,β,γ为大于零的惩罚参数;步骤(4):将步骤(3)中的最小化问题转换为关于变量的u,d1,d2,d3的交替最小求解问题,即将其它变量固定求解其中一个变量,使用交替最 小迭代策略迭代求解上述最小求解问题,得到去模糊后的图像。
- 如权利要求2所述的方法,其特征在于,所述步骤上(4)中使用交替最小迭代策略迭代求解上述最小求解问题,得到去模糊后的图像,具体包括:初始化最大迭代次数kMax,并初始化迭代次数k=0;判断迭代次数k是否小于最大迭代次数kMax,如果不小于则终止迭代;如果小于则继续进行下述迭代操作:更新迭代次数k=k+1;求解步骤(4)中的子问题(4.1)以更新复原图像uk;求解步骤(4)中的子问题(4.2)以更新辅助变量d1 k;求解步骤(4)中的子问题(4.2)以更新复原图像d2 k;求解步骤(4)中的子问题(4.3)以更新复原图像d3 k;计算更新后的复原图像uk的PSNR;迭代终止后,取最大的PSNR对应的恢复图像作为最终的清晰图像输出。
- 如权利要求6或7所述的方法,其特征在于,α=β=γ=1。
- 如权利要求6或7所述的方法,其特征在于,所述w=5。
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