基于多尺度卷积神经网络的图像去噪方法研究

应用传统方法对图像去噪处理后,图像的峰值信噪比仍旧比较低,文章提出了基于多尺度卷积神经网络的图像去噪方法。以多尺度卷积神经网络为架构,由去噪模块与边缘模块组建成多尺度卷积神经网络去噪模型,利用残差学习法对模型进行训练,并利用寻优迭代算法对代价函数进行求解,利用训练好的去噪模型对图像进行多尺度卷积计算,根据噪声真值对图像平滑处理,实现图像去噪。通过实验证明,本次设计方法去噪后图像噪声有了明显降低,峰值信噪比高于传统方法。     

基于小波变换的红外图像去噪

小波图像去噪已经成为目前图像去噪的主要方法之一。本文介绍了小波阈值去噪的基本原理,并将其应用于红外图像去噪。实验结果表明,该算法优于传统滤波去噪方法,能有效地抑制噪声,可用来对红外图像做进一步的分析与处理。     

基于Contourlet域HMT模型的红外图像去噪算法

去噪是图像处理的一个关键问题,文章提出了基于多尺度分析下的红外图像去噪算法.在对红外图像噪声特点进行详细分析的基础上,验证了红外图像的Contourlet子带系数满足广义高斯(Generalized Gaussian Distribution)GGD模型,提出了用Contourlet域隐马尔可夫树(Contourlet domain Hidden Markov Trees)CHMT来进行红外图像的去噪.将算法应用于几种红外图像,对红外图像去噪视觉效果和峰值信噪比两方面进行比较,文中提出的去噪方法取得了较好的效果,尤其是在边缘保持方面.     

基于CNN+LSTM的藏语语音去噪算法

本文主要研究藏语语音去噪算法,提出一种基于频谱映射的卷积长短期记忆藏语语音去噪算法。该算法由数据准备模块、特征提取模块、网络模块以及音频还原模块4个模块组成,以纯净的拉萨语语音和加了噪声库NOISE-92六种单一噪声的带噪语音作为数据集,提取带噪语音和纯净语音的对数功率谱特征作为输入对网络进行训练,网络的效果通过可感知语音质量和短时客观可懂度两个指标进行评价。实验结果表明,该算法在非平稳噪声上的去噪效果优于平稳噪声,且信噪比越大其去噪效果越好;在低信噪比下,该算法在非平稳噪声上的表现优于谱减法和最小均方误差法。     

基于梯度可感知通道注意力模块的红外小目标检测前去噪网络

红外图像去噪在军事及民用领域应用广泛。现有基于深度学习的图像去噪方法主要为可见光图像设计,此类方法容易过度平滑图像细节,从而导致弱小目标丢失,为后续的检测任务带来困难。为了在去除噪声的同时保留好红外图像中的目标信息,本文提出了一种基于梯度可感知通道注意力模块的红外弱小目标检测前去噪网络。该网络首先采用编码器-解码器结构来去除图像中的加性噪声,然后通过梯度可感知通道注意力模块对图像高频区域进行自适应增强,有效保持红外弱小目标的响应强度。此外,本文提出了领域第一个包含3 981张含噪声的红外图像数据集。实验结果表明,该网络能够在有效去除加性噪声的同时避免过度平滑,很好地保留了红外图像中的目标信息,最终实现了在含噪声环境下的高鲁棒性红外弱小目标检测。     

基于残差编解码器的通道自适应超声图像去噪方法

超声图像去噪对提高超声图像的视觉质量和完成其他相关的计算机视觉任务都至关重要。超声图像中的特征信息与斑点噪声信号较为相似,用已有的去噪方法对超声图像去噪,容易造成超声图像纹理特征丢失,这会对临床诊断的准确性产生严重的干扰。因此,在去除斑点噪声的过程中,需尽量保留图像的边缘纹理信息才能更好地完成超声图像去噪任务。该文提出一种基于残差编解码器的通道自适应去噪模型(RED-SENet),能有效去除超声图像中的斑点噪声。在去噪模型的解码器部分引入注意力反卷积残差块,使本模型可以学习并利用全局信息,从而选择性地强调关键通道的内容特征,抑制无用特征,能提高模型去噪的性能。在2个私有数据集和2个公开数据集上对该模型进行定性评估和定量分析,与一些先进的方法相比,该模型的去噪性能有显著提升,并在噪声抑制以及结构保持方面具有良好的效果。     

基于稀疏表示的红外图像去噪算法研究

红外图像具有动态范围窄、对比度低、易受噪声污染等缺点,传统红外图像去噪算法在去除噪声的同时也滤掉了图像细节。提出了一种基于稀疏表示的红外图像去噪新方法。该方法首先将原始红外图像进行聚类分析,再将每一聚类子图像分解成字典,由稀疏系数矩阵重构去噪后的红外图像。实验结果表明,该方法相比于传统红外图像去噪算法,能更好地保留图像的细节信息,视觉效果比较理想。     

基于卷积融合字典的电路板红外图像去噪研究

由于红外图像存在噪声,电路板芯片定位困难,因此基于红外图像的机载电路板故障诊断方法在实际应用中诊断效果并不理想。针对此问题,本文在卷积稀疏编码和字典学习的基础上,提出了一种基于卷积融合字典学习的航电系统电路板红外图像去噪算法。首先,并行融合改进卷积稀疏编码结构和离散余弦变换字典形成复合初始化字典,以有效提取电路板红外图像特征;接着,建立稀疏特征矩阵,更新红外图像特征原子;最后,将稀疏特征系数带入算法对模型进行训练和测试,完成电路板红外图像的去噪重构。实验采用航电系统电源电路板进行可靠性分析,实验结果表明,与K SVD和卷积网络去噪方法相比,本文算法在图像视觉效果,输出PSNR和SSIM方面更具优势,具有更好的去噪效果。     

基于小波变换和改进SVD的红外图像去噪

针对小波变换红外图像去噪需要已知噪声先验知识的缺点,提出了一种基于分块奇异值分解的正交小波变换红外图像去噪新算法。首先对红外图像进行离散正交小波变换,并对高频图像采用改进的分块奇异值分解估计小波系数,其中对奇异向量采用傅里叶变换进行了修正;最后将低频图像与估计的高频图像通过小波反变换得到去噪图像。仿真结果表明,该图像去噪算法能在无噪声先验知识条件下有效去除图像噪声,信噪比有了明显提高,并获得了良好的主观视觉效果。     

激光主动成像制导图像去噪算法研究

快速有效地对所获图像进行去噪是提高激光主动成像制导精度的关键一步。针对成像中的散斑噪声,提出了一种改进的小波阈值与基于积分图像的非局部均值滤波相结合的去噪算法。首先对激光主动成像图像进行噪声分析;然后通过对数变换将乘性噪声转换为加性噪声;而后将含噪图像进行两层小波分解,在第一层高频部分运用改进的小波阈值法,在第二层高频部分运用基于积分图像的非局部均值滤波算法进行去噪;最后进行相应的逆变换得到去噪图像。理论分析和实验结果证明,该算法能有效去除噪声,较好地保证了图像细节,并且满足激光主动成像制导对图像去噪实时性的要求。     

Improved Denoising Autoencoder for Maritime Image Denoising and Semantic Segmentation of USV

Unmanned surface vehicle(USV)is currently a hot research topic in maritime communication network(MCN),where denoising and semantic segmentation of maritime images taken by USV have been rarely studied.The former has recently researched on autoencoder model used for image denoising,but the existed models are too complicated to be suitable for real-time detection of USV.In this paper,we proposed a lightweight autoencoder combined with inception module for maritime image denoising in different noisy environments and explore the effect of different inception modules on the denoising performance.Furthermore,we completed the semantic segmentation task for maritime images taken by USV utilizing the pretrained U-Net model with tuning,and compared them with original U-Net model based on different backbone.Subsequently,we compared the semantic segmentation of noised and denoised maritime images respectively to explore the effect of image noise on semantic segmentation performance.Case studies are provided to prove the feasibility of our proposed denoising and segmentation method.Finally,a simple integrated communication system combining image denoising and segmentation for USV is shown.     

基于改进生成对抗网络的低剂量CT去噪算法

针对低剂量计算机断层扫描(computerized tomography,CT)在图像采集过程中引入较多噪声,造成图像质量严重下降的问题, 提出一种基于残差注意力机制与复合感知损失的低剂量CT去噪算法。在该算法中,利用生 成对抗网络完成对低剂量CT图像的去噪,在网络框架中引入多尺度特征提取及残差注意力 模块,以融合图像中不同尺度的信息,提高网络对噪声特征的区分能力,避免在去噪过程中 丢失图像细节信息。同时采用复合感知损失函数,以加快网络收敛速度,促使去噪图像在感 知上与原图像更接近。实验结果表明:与现有的算法相比,所提算法能够有效抑制低剂量 CT图像中的噪声,并恢复更多的纹理细节;对比低剂量CT图像,所提算法处理后的CT 图像峰值信噪比(peak signal-to-noise ratio,PSNR) 值提高了31.72%, 结构相似性(structural similarity,SSIM)值提高了13.15%,可以满足更高的医学影像诊断要求 。     

Event-guided low light image enhancement via a dual branch GAN

In the low light conditions, images are corrupted by low contrast and severe noise, but event cameras capture event streams with clear edge structures. Therefore, we propose an Event-Guided Low Light Image Enhancement method using a dual branch generative adversarial networks and recover clear structure with the guide of events. To overcome the lack of paired training datasets, we first synthesize three datasets containing low-light event streams, low-light images, and the ground truth normal-light images. Then, in the generator network, we develop an end-to-end dual branch network consisting of a image enhancement branch and a gradient reconstruction branch. The image enhancement branch is employed to enhance the low light images, and the gradient reconstruction branch is utilized to learn the gradient from events. Moreover, we develops the attention based event-image feature fusion module which selectively fuses the event and low-light image features, and the fused features are concatenated into the image enhancement branch and gradient reconstruction branch, which respectively generate the enhanced images with clear structure and more accurate gradient images. Extensive experiments on synthetic and real datasets demonstrate that the proposed event guided low light image enhancement method produces visually more appealing enhancement images, and achieves a good performance in structure preservation and denoising over state-of-the-arts.     

基于引导滤波的多分支注意力残差红外图像去噪网络

目前红外图像广泛应用于各个领域,但受限于探测单元的非均匀性,使得红外图像具有低信噪比、视觉效果模糊的缺点,严重影响其在高端领域中的应用。常用的去噪算法无法兼顾降噪平滑和边缘细节的保持,针对这一问题,文中提出了一种基于引导滤波的多分支注意力残差去噪网络。根据引导滤波原理设计一种引导卷积模块,同时为了兼顾提取浅层和深层特征设计了多分支注意力残差模组。通过实验证明加入新模块后的网络不仅可以有效地实现红外图像降噪,而且能最大程度地保持图像中的边缘细节信息,提升视觉效果,同时在PSRN和SSIM指标上也有良好的表现。     

Speckle noise removal based on structural convolutional neural networks with feature fusion for medical image

Application of convolutional neural networks (CNNs) for image additive white Gaussian noise (AWGN) removal has attracted considerable attentions with the rapid development of deep learning in recent years. However, the work of image multiplicative speckle noise removal is rarely done. Moreover, most of the existing speckle noise removal algorithms are based on traditional methods with human priori knowledge, which means that the parameters of the algorithms need to be set manually. Nowadays, deep learning methods show clear advantages on image feature extraction. Multiplicative speckle noise is very common in real life images, especially in medical images. In this paper, a novel neural network structure is proposed to recover noisy images with speckle noise. Our proposed method mainly consists of three subnetworks. One network is rough clean image estimate subnetwork. Another is subnetwork of noise estimation. The last one is an information fusion network based on U-Net and several convolutional layers. Different from the existing speckle denoising model based on the statistics of images, the proposed network model can handle speckle denoising of different noise levels with an end-to-end trainable model. Extensive experimental results on several test datasets clearly demonstrate the superior performance of our proposed network over state-of-the-arts in terms of quantitative metrics and visual quality.     

Cascaded and Recursive ConvNets (CRCNN): An effective and flexible approach for image denoising

Recently, discriminative learning methods have gained substantial interest in solving inverse imaging problems due to their decent performance and fast inferencing capability. Those methods need separate models for specific noise levels, which in turn require multiple models to be trained to denoise an image. However, images exhibit spatial variant noise which limits the applicability of such methods. In addition, the discriminative learning methods introduce artifacts such as blurring, deblocking, and so forth while denoising an image. To address these issues, we propose a cascaded and recursive convolutional neural network (CRCNN) framework which can cope with spatial variant noise and blur artifacts in a single denoising framework. The CRCNN takes into account down-sampled sub-images for fast inferencing along with the noise level map. We adopt the hybrid orthogonal projection and estimation method on the convolutional layers to improve the generalization capability of the network in terms of non-uniform and spatial variant noise levels. In contrast to the existing methods, the CRCNN framework allows both denoising and deblurring of images using a single framework which preserves the fine details in a denoised image. Extensive experiments have been conducted to validate the effectiveness and flexibility of the CRCNN framework on real as well as synthetic noisy images in comparison to the state-of-the-art denoising methods. The results show that the CRCNN performs effectively on both synthetic as well as spatial variant noise-induced images, thus, proving the practicability of the framework.     

基于迭代深度网络的红外图像增强算法

由于现有基于深度网络的图像增强模型直接学习退化图像与清晰图像之间的映射函数,忽略了观测模型保真项的约束,导致恢复的图像存在虚假纹理和细节丢失.本文提出了一种用于红外图像增强的改进深度网络,该网络将深度学习网络嵌入到一个迭代的图像增强任务中,通过图像增强模块和反投影模块交错优化,实现数据一致性约束.本文提出的深度网络不仅...     

Joint image-to-image translation with denoising using enhanced generative adversarial networks

Impressive progress has been made recently in image-to-image translation using generative adversarial networks (GANs). However, existing methods often fail in translating source images with noise to target domain. To address this problem, we joint image-to-image translation with image denoising and propose an enhanced generative adversarial network (EGAN). In particular, built upon pix2pix, we introduce residual blocks in the generator network to capture deeper multi-level information between source and target image distribution. Moreover, a perceptual loss is proposed to enhance the performance of image-to-image translation. As demonstrated through extensive experiments, our proposed EGAN can alleviate effects of noise in source images, and outperform other state-of-the-art methods significantly. Furthermore, we experimentally indicate that the proposed EGAN is also effective when applied to image denoising.     

自适应维纳滤波在钢水红外图像去噪中的应用

红外测温系统的应用减少了人工测温的安全事故,但其温度的准确性取决于由红外热像仪获得的图像的质量.为了对钢水红外图像质量的影响,提出了基于自适应维纳滤波的去噪方法.通过自相关的参数指数衰减模型来控制算法的计算复杂性和敏感性,进而有效提高维纳滤波器的去降噪性能.基于对不同温度下钢水红外图像的去噪处理,验证了所提去噪方法比维...