WO2022267641A1 - 一种基于循环生成对抗网络的图像去雾方法及系统 - Google Patents
一种基于循环生成对抗网络的图像去雾方法及系统 Download PDFInfo
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- the invention relates to an image defogging method and system based on a cyclic generative confrontation network, and belongs to the technical field of image processing.
- the processing algorithms for foggy images are mainly divided into three categories.
- One is based on the image enhancement algorithm.
- the dehazing method based on image enhancement is to enhance the degraded image, improve the quality of the image, and highlight the features and valuable information of the scene in the image.
- This method does not consider the cause of image degradation, which may result in the loss of part of the image information and distortion after processing.
- the second method is based on the atmospheric scattering model. This method first estimates the parameters of the atmospheric scattering model based on some prior knowledge of the haze-free image, and then substitutes the parameters into the model to restore the haze-free image.
- the haze-free image processed by this method is clearer and more natural, with less loss of detail, but different prior knowledge has limitations in its respective application scenarios.
- the third is the method based on deep learning.
- Most studies use the synthetic haze image data as the training set to train different types of convolutional neural networks to estimate the transmittance or directly estimate the haze-free image.
- More representative networks include Dehazenet, MSCNN, AOD-NET, DCPN, etc., but generally require large-scale training data sets, and require clear and foggy image pairs. Once the conditions are not met, these learning-based methods will fail. . In practice, however, it is very difficult to collect large pairwise datasets with the required scene realism due to scene variations and other factors. However, the amount of information in the synthesized foggy image is inconsistent with the real foggy image, which affects the dehazing effect.
- the technical problem to be solved by the present invention is to overcome the defects of the prior art, provide an image defogging method and system based on cyclic generative confrontation network, and solve the lack of true pairing faced by the existing image defogging method based on deep learning
- There are problems such as insufficient learning of data set, image defogging feature learning based on recurrent generative confrontation network, and generated image artifacts affecting the quality of image defogging.
- the present invention provides an image defogging method based on recurrent generative confrontation network, including:
- the densely connected recurrent generation confrontation network includes a generator, the generator includes an encoder, a converter and a decoder, the encoder includes a densely connected layer for extracting features of an input image, and the converter includes an over-conversion layer for converting the encoded
- the features extracted in the decoder stage are combined.
- the decoder includes a densely connected layer and a scaled convolutional neural network layer. The densely connected layer is used to restore the original features of the image, and the scaled convolutional neural network layer is used to remove the chessboard of the restored original features. grid effect to get the final output haze-free image.
- the converter stage also includes a dense residual block.
- the dense residual block includes a dense connection layer and a transition conversion layer.
- the dense connection layer is used to combine the features extracted by the encoder.
- the transition conversion layer is used to maintain The dimensions of the input image and the output image are the same, which is convenient for further operation of the subsequent decoder.
- the densely connected cyclic generative adversarial network also includes a skipping layer, which connects an encoder and a decoder, and is used for transmitting data information streams.
- the training process of the densely connected loop generating confrontation network includes:
- the densely connected cyclic generation confrontation network also includes the discriminator Dx and the discriminator Dy.
- the training samples of foggy images are recorded as data set P(x), and the training sample data set of fog-free images P(y);
- the trained densely connected recurrent generative adversarial network is determined.
- stochastic gradient descent algorithm includes:
- the update formula is:
- ⁇ is the basic learning rate
- W′ is the updated weight parameter
- L G is the total loss function
- L G L gan +L cyc (G,F)+ ⁇ L Per (G,F)
- L gan is the overall confrontation loss function
- L gan L gan1 +L gan2
- L gan1 is the confrontation loss function of the generator G and the discriminator Dy:
- L gan1 E y ⁇ P(y) [logD y (y)]+E x ⁇ P(x) [log(1-D y (G(x)))]
- L gan2 is the confrontation loss function of the generator F and the discriminator Dx:
- L gan2 E x ⁇ P(x) [logD x (x)]+E y ⁇ P(y) [log(1-D x (F(y)))]
- x represents a foggy image
- y represents a fog-free image
- x ⁇ P(x) means that x obeys the distribution of the data set sample P(x)
- y ⁇ P(y) means that y obeys the distribution of the data set sample P(y) distribution
- G(x) is the fog-free image generated by the generator G from the foggy image in the dataset P(x)
- F(y) is the fog-free image generated by the generator F from the foggy image in the dataset P(y)
- E represents the mathematical expectation
- D y (y), D y (G(x)) respectively represent the discriminative results of the discriminator Dy on the fog-free image y and G(x)
- D x (x), D x (F(y)) respectively represent the discrimination results of the discriminator Dx for x and F(y);
- L cyc (G, F) is the cycle consistency loss function
- F(G(x)) is the foggy image regenerated by the generator F from the fog-free image G(x);
- G(F(y)) is the foggy image generated by the generator G from the foggy image F(y). fog-free images,
- a computer-readable storage medium that stores one or more programs, the one or more programs including instructions that, when executed by a computing device, cause the computing device to perform any of the methods .
- An image defogging system based on recurrent generative adversarial networks comprising,
- one or more processors memory, and one or more programs, wherein one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs include Instructions for performing any of the methods described.
- image defogging based on cyclic generative adversarial networks eliminates the requirement for paired data sets and solves the problem that artificial synthetic data set training networks cannot be applied to real dehazing scenarios;
- the dense connection structure in the DenseNet network and the residual structure in the ResNet network are introduced into the generator network, which increases the capacity of network parameters, improves the utilization of feature maps, and solves the problem of feature learning in recurrent generation confrontation networks. Insufficient, the image details are not specific enough, and the network training efficiency is maintained;
- a scaling convolutional neural network is added to the decoder to remove network artifacts and improve the quality of the generated image.
- Fig. 1 is a schematic flow diagram of the overall network architecture implemented by the method of the present invention
- Fig. 2 is a schematic structural diagram of the dense residual cyclic generation confrontation network generator described in the method embodiment of the present invention
- Figure 3 is a network structure diagram of the discriminator.
- FIG. 1 is a schematic flow diagram of the overall network architecture implemented by an image defogging method based on a recurrent generative adversarial network according to the present invention.
- Step 1 build a recurrent generative adversarial network with dense residuals.
- the two generators G and F generate four output results, which are: input a foggy image, output a dehazed image and a cycle-generated foggy image; the input is a fog-free image, and the output is generated The foggy image and the recurrently generated fog-free image.
- the generator G generates corresponding haze-free images G(x) from the hazy images in the dataset P(x), on the other hand, the generator F generates haze-free images from the haze-free images in the dataset P(y). Image F(y) of fog.
- the discriminator Dy judges the quality of the fog-free image generated by the generator G, and the discriminator Dx judges the quality of the foggy image generated by the generator F.
- the output value range of the discriminator is [0,1], and the output value of the discriminator is close to 0, then continue to train the generator; the output value of the discriminator is close to 1, which proves that the quality of the image generated by the generator meets the requirements, and further training of the discriminator can be continued.
- the image quality generated by the generator is better, and the discrimination ability of the discriminator is getting stronger and stronger.
- the two generators G and F can be jointly optimized, and the generator F generates a foggy image F(G(x) from the non-foggy image G(x) ); the generator G generates a fog-free image G(F(y)) from the foggy image F(y).
- the generator F generates a foggy image F(G(x) from the non-foggy image G(x) ); the generator G generates a fog-free image G(F(y)) from the foggy image F(y).
- x and F(G(x)) are kept close, and y and G(F(y)) are kept close to get the optimal dehazing model.
- FIG. 2 is a schematic diagram of the generator structure of the dense residual loop generation confrontation network described in the method embodiment of the present invention.
- the generator network is divided into three stages: encoding, converter and decoding.
- Encoding stage Extract the features of the input image. This paper replaces the original convolution operation with a densely connected layer to improve the utilization of the feature map.
- the densely connected layer contains three densely connected convolutions with a size of 3 ⁇ 3 and a padding of 2.
- Floor Feature maps are concatenated in depth in densely connected layers.
- Converter stage Combine the features extracted in the encoder stage, process the feature map through the conversion layer, and the convolution scale is 1 ⁇ 1.
- the conversion layer is followed by N dense residual blocks to increase the capacity of network parameters, and the number of N can be adjusted later according to the training situation.
- the dense residual block contains densely connected layers and transition layers.
- the transition conversion layer After dense connection processing, the transition conversion layer performs transition processing on the dense connection processing results, including normalization processing and activation operations.
- the feature map after the transition transformation is added component-wise with the input data to form an identity mapping layer. After the transition transformation, the output of the densely connected layer has the same dimension as the input data, which guarantees the residual operation. In this process, the resolution of the feature map processed by the network is low, and the amount of convolution calculation is small, so the densely connected residual block will not have a great impact on the network efficiency while deepening the network and improving the utilization rate.
- Decoding stage Restore the original features of the image and generate the corresponding image.
- the dense connection method is also used in the upsampling process of the decoder.
- this paper adds a scaling convolution operation to eliminate the checkerboard artifact effect, that is, using the nearest The adjacent interpolation scales the image to the target size, and then performs the convolution operation. Finally, the features restored by upsampling are combined to output the final image result.
- a layer-skip connection is introduced between the two modules of the encoder and the decoder to transmit the data information flow, so as to provide more information transmission between the encoding process and the decoding process.
- Figure 3 is the network structure diagram of the discriminator.
- the discriminator designed in this paper is a fully convolutional network, which uses 5 convolutional networks with a size of 4 ⁇ 4 for feature extraction.
- the first layer includes a convolutional layer and a leaky corrected linear unit (LeakyReLu) activation function;
- the middle three-layer convolutional layer compresses the size and increases the dimension, then performs batch normalization to accelerate the convergence of the network, and then uses the activation function to perform activations;
- the last layer contains only convolutional operations to maintain stability during training.
- Step 2 construct a loss function, which includes adversarial loss, cycle consistency loss and perceptual loss.
- Adversarial loss and cycle consistency loss are inherent loss functions in the recurrent generative adversarial network network, which can complete the training of the model using asymmetric data.
- a perceptual loss function is specially introduced to strengthen the constraints on the quality of generated images.
- Adversarial loss used to constrain the image generation during the confrontation process, the confrontation loss of the generator G and the discriminator Dy is recorded as:
- L gan1 E y ⁇ P(y) [logD y (y)]+E x ⁇ P(x) [log(1-D y (G(x)))](2)
- L gan2 E x ⁇ P(x) [logD x (x)]+E y ⁇ P(y) [log(1-D x (G(y)))](3)
- x represents a foggy image
- y represents a fog-free image
- x ⁇ P(x) means that x obeys the distribution of the data set sample P(x)
- y ⁇ P(y) means that y obeys the distribution of the data set sample P(y) distribution
- E stands for mathematical expectation.
- Cycle Consistency Loss It is used to constrain the mutual conversion of foggy and fog-free image data, and solves the problem that the output distribution cannot be guaranteed to be consistent with the target distribution in the case of only adversarial loss. Recorded as:
- F(G(x)) is the loop image of the original image, which brings back the result G(x) of the generator as the original image.
- G(F(y)) is a cycle image of the original image y, which can make F(y) return to the original image y.
- the purpose of training is to keep F(G(x)) close to x, G(F(y)) and y.
- Perceptual Loss Constraining the perceptual details of image generation from a high-level semantic perspective. Using only the first two losses will result in over-smoothing and loss of detail. The perceptual loss calculates the distance between the network generated result and the true value in the feature map output by a specific layer of the pre-trained VGG network (classic network structure in the convolutional neural network). The perceptual loss is expressed as:
- the total loss function is expressed as:
- ⁇ is the weight ratio of the perceptual loss function, which reflects the degree of influence of the part of the perceptual loss function on the overall loss function, which is taken as 0.6 here.
- Step 3 network training.
- the discriminator is pre-trained.
- the discriminator only needs to know the pixel distribution characteristics of the fog on the image, such as intensity distribution and position distribution, to judge whether the image is a real foggy image or a real fog-free image.
- the two sets of data sets A and B selected in step 1 are used for the training of the discriminator.
- the discriminator can initially judge the characteristics of fog by using labels.
- the result of the discriminator will be marked is 1; similarly, if two fog-free images are input, the result of the discriminator is also marked as 1; if one foggy and one fog-free image is respectively input, the result is marked as 0, and the pre-training of the discriminator makes the later discrimination
- the game process between generator and generator is more real and effective.
- the discriminator is trained by fixing the weight parameters of the generator, and the decline of the adversarial loss function, the cycle consistent loss function and the perceptual loss function are respectively recorded, and further, in the forward propagation and back propagation
- the process iteratively updates the discriminator weight parameters continuously.
- the generator is trained by the fixed discriminator in the same way, and the weight parameters of the generator are continuously updated.
- the condition for determining stability here is that the loss function error ⁇ of 10 consecutive adjacent cycles is stable at about 0.001.
- the number of training reaches 500 or ⁇ 0.001, the training is stopped.
- Step 4 Input the foggy image into the above-mentioned pre-trained densely connected recurrent generative adversarial network to obtain a fog-free image.
- the present invention also provides a computer-readable storage medium storing one or more programs, and the one or more programs include instructions, and the instructions, when executed by a computing device, cause the computing device to execute the described any of the methods.
- the present invention also provides an image defogging system based on a recurrent generative confrontation network, including:
- one or more processors memory, and one or more programs, wherein one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs include Instructions for performing any of the methods described.
- the present invention uses a densely connected cyclic generative confrontation network to perform image defogging, which belongs to end-to-end defogging, and the input of a foggy image can directly output a fog-free image. Due to the use of cycle generation confrontation network, it can solve the problem of lack of real paired data sets faced by the existing image defogging method based on deep learning, introduce dense connection and residual network structure, optimize the CycleGan network structure, and increase network parameters capacity and improve the utilization of feature maps. It solves the problem of insufficient feature learning in the recurrent generation confrontation network, and uses scaling convolution to avoid network artifacts and improve the quality of generated images.
- the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
- computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
- These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions
- the device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.
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Abstract
Description
Claims (7)
- 一种基于循环生成对抗网络的图像去雾方法,其特征在于,包括:获取待处理的有雾图像;输入到预先训练好的密集连接循环生成对抗网络,输出无雾图像;所述密集连接循环生成对抗网络包括生成器,生成器包括编码器、转换器和解码器,编码器包括密集连接层,用于提取输入图像的特征,转换器包括过度转换层,用于将编码器阶段提取的特征进行组合,解码器包括密集连接层和缩放卷积神经网络层,密集连接层用于还原图像的原有特征,缩放卷积神经网络层用于去除还原的原有特征的棋盘格效应,得到最终输出的无雾图像。
- 根据权利要求1所述的基于循环生成对抗网络的图像去雾方法,其特征在于,所述转换器阶段还包括密集残差块,密集残差块包含密集连接层和过渡转换层,密集连接层用于将编码器提取到的特征进行组合拼接,过渡转换层用于保持输入图像和输出图像的维度相同。
- 根据权利要求1所述的基于循环生成对抗网络的图像去雾方法,其特征在于,所述密集连接循环生成对抗网络还包括跳层,连接编码器和解码器,用于进行数据信息流的传输。
- 根据权利要求1所述的基于循环生成对抗网络的图像去雾方法,其特征在于,所述密集连接循环生成对抗网络的训练过程包括:密集连接循环生成对抗网络还包括判别器判别器Dx和判别器Dy,生成器有两个,分别为生成器G和生成器F,其中生成器G和生成器F,判别器Dx和判别器Dy分别具有着相同的网络结构;从Reside数据集中随机选取无雾图像和有雾图像各N张作为训练样本,有雾图像的训练样本记为数据集P(x),无雾图像的训练样本数据集P(y);对数据集P(x)和数据集P(y)进行标记,利用标记后的数据集P(x)和数据集P(y)对判别器Dx和判别器Dy进行训练,使得判别器Dx和判别器Dy能够判断若输入两幅有雾图像,判别器结果标记为1,若输入两幅无雾图像判别器结果也标记为1,若分别输入一幅有雾图像,一幅无雾图像,判别器结果标记为0;对生成器和判别器的网络的权重参数W进行初始化;初始化完成后,根据数据集P(x)和数据集P(y)确定输入样本;根据输入样本,先固定生成器权重参数对判别器进行训练,使用随机梯度下降算法来更新判别器的最终权重参数,之后固定判别器的权重参数为所述更新的判别器的最终权重参数对生成器进行训练,使用随机梯度下降算法来更新生成器的最终权重参数;根据判别器的最终权重参数和生成器的最终权重参数确定训练好的密集连接循环生成对抗网络。
- 根据权利要求4所述的基于循环生成对抗网络的图像去雾方法,其特征在于,所述随机梯度下降算法包括:根据输入样本利用如下更新公式更新权重参数,更新公式为:其中,α为基础学习率,W′为更新后的权重参数,L G为总损失函数,L G=L gan+L cyc(G,F)+γL Per(G,F)L gan为整体对抗损失函数,L gan=L gan1+L gan2L gan1为生成器G和判别器Dy的对抗损失函数:L gan1=E y~P(y)[log D y(y)]+E x~P(x)[log(1-D y(G(x)))]L gan2为生成器F和判别器Dx的对抗损失函数:L gan2=E x~P(x)[log D x(x)]+E y~P(y)[log(1-D x(F(y)))]其中,x代表有雾图像,y代表无雾图像,x~P(x)表示x服从数据集样本P(x)的分布,y~P(y)表示y服从数据集样本P(y)的分布,G(x)为生成器G从数 据集P(x)中的有雾图像生成的无雾图像,F(y)为生成器F从数据集P(y)中的无雾图像生成的有雾图像,E表示数学期望,D y(y)、D y(G(x))分别表示判别器Dy对无雾图像y和G(x)的判别结果;D x(x)、D x(F(y))、分别表示判别器Dx对x和F(y)的判别结果;L cyc(G,F)为循环一致性损失函数:L cyc(G,F)=E x~P(x)[||F(G(x))-x|| 1]+E y~P(y)[||G(F(y))-y|| 1]其中,F(G(x))为生成器F从无雾图像G(x)再生成的有雾图像;G(F(y))为生成器G从有雾图像F(y)又生成的无雾图像,L Per(G,F)为感知损失函数:重新获取输入样本,并重复上述步骤,通过不断调整权重参数使总损失函数趋于平稳或循环次数达到预先设置的阈值,则停止训练,输出最终的权重,趋于平稳的判定条件是连续若干次循环的损失函数误差∈稳定不大于0.001。
- 一种存储一个或多个程序的计算机可读存储介质,其特征在于:所述一个或多个程序包括指令,所述指令当由计算设备执行时,使得所述计算设备执行根据权利要求1至5所述的方法中的任一方法。
- 一种基于循环生成对抗网络的图像去雾系统,其特征在于:包括,一个或多个处理器、存储器以及一个或多个程序,其中一个或多个程序存储在所述存储器中并被配置为由所述一个或多个处理器执行,所述一个或多个程序包括用于执行根据权利要求1至5所述的方法中的任一方法的指令。
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