Due to highly underdetermined nature of Single Image Super-Resolution(SISR)problem,deep learning neural networks are required to be more deeper to solve the problem effectively.One of deep neural networks successful i...Due to highly underdetermined nature of Single Image Super-Resolution(SISR)problem,deep learning neural networks are required to be more deeper to solve the problem effectively.One of deep neural networks successful in the Super-Resolution(SR)problem is ResNet which can render the capability of deeper networks with the help of skip connections.However,zero padding(ZP)scheme in the network restricts benefits of skip connections in SRResNet and its performance as the ratio of the number of pure input data to that of zero padded data increases.In this paper.we consider the ResNet with Partial Convolution based Padding(PCP)instead of ZP to solve SR problem.Since training of deep neural networks using patch images is advantageous in many aspects such as the number of training image data and network complexities,patch image based SR performance is compared with single full image based one.The experimental results show that patch based SRResNet SR results are better than single full image based ones and the performance of deep SRResNet with PCP is better than the one with ZP.展开更多
前视声呐(Forward-Looking Sonar,FLS)使用换能器基阵收发声波,通过回波探测水下物体.在浅海环境,由于水下介质的反射、散射与不均匀波动,前视声呐图像极易引入散斑噪声.本文针对前视声呐图像散斑噪声,结合SRResNet与非对称金字塔非局部...前视声呐(Forward-Looking Sonar,FLS)使用换能器基阵收发声波,通过回波探测水下物体.在浅海环境,由于水下介质的反射、散射与不均匀波动,前视声呐图像极易引入散斑噪声.本文针对前视声呐图像散斑噪声,结合SRResNet与非对称金字塔非局部块,提出了ANLResNet网络用于前视声呐图像去噪,并针对前视声呐图像特性,使用FieldⅡ构建模拟前视声呐图像数据集,对网络进行训练.实验结果表明,本文提出的ANLResNet网络能有效的去除前视声呐图像中的散斑噪声,获得良好的视觉效果.并通过峰值信噪比(Peak Signal to Noise Ratio,PSNR)、等效视数(Equivalent Number of Looks,ENL)、散斑抑制指数(Speckle Suppression Index,SSI)3个图像质量评价指标评价降噪效果.在模拟前视声呐图像去噪上,本文算法相比于传统算法、改进BM3D算法和Autoencoder网络,平均PSNR至少提高了8.12%.在真实前视声呐图像去噪上,本文算法相比于传统算法、改进BM3D算法和SRResNet等效视数至少提高了16.77%,散斑抑制指数至少降低了2.84%.相比于Autoencoder网络等效视数提高了4.30%.本文方法主要用于前视声呐图像去噪,对于其他声学图像的降噪,散斑噪声的抑制上也有一定的应用价值.展开更多
文摘Due to highly underdetermined nature of Single Image Super-Resolution(SISR)problem,deep learning neural networks are required to be more deeper to solve the problem effectively.One of deep neural networks successful in the Super-Resolution(SR)problem is ResNet which can render the capability of deeper networks with the help of skip connections.However,zero padding(ZP)scheme in the network restricts benefits of skip connections in SRResNet and its performance as the ratio of the number of pure input data to that of zero padded data increases.In this paper.we consider the ResNet with Partial Convolution based Padding(PCP)instead of ZP to solve SR problem.Since training of deep neural networks using patch images is advantageous in many aspects such as the number of training image data and network complexities,patch image based SR performance is compared with single full image based one.The experimental results show that patch based SRResNet SR results are better than single full image based ones and the performance of deep SRResNet with PCP is better than the one with ZP.
文摘前视声呐(Forward-Looking Sonar,FLS)使用换能器基阵收发声波,通过回波探测水下物体.在浅海环境,由于水下介质的反射、散射与不均匀波动,前视声呐图像极易引入散斑噪声.本文针对前视声呐图像散斑噪声,结合SRResNet与非对称金字塔非局部块,提出了ANLResNet网络用于前视声呐图像去噪,并针对前视声呐图像特性,使用FieldⅡ构建模拟前视声呐图像数据集,对网络进行训练.实验结果表明,本文提出的ANLResNet网络能有效的去除前视声呐图像中的散斑噪声,获得良好的视觉效果.并通过峰值信噪比(Peak Signal to Noise Ratio,PSNR)、等效视数(Equivalent Number of Looks,ENL)、散斑抑制指数(Speckle Suppression Index,SSI)3个图像质量评价指标评价降噪效果.在模拟前视声呐图像去噪上,本文算法相比于传统算法、改进BM3D算法和Autoencoder网络,平均PSNR至少提高了8.12%.在真实前视声呐图像去噪上,本文算法相比于传统算法、改进BM3D算法和SRResNet等效视数至少提高了16.77%,散斑抑制指数至少降低了2.84%.相比于Autoencoder网络等效视数提高了4.30%.本文方法主要用于前视声呐图像去噪,对于其他声学图像的降噪,散斑噪声的抑制上也有一定的应用价值.
