小波变换在纹理图像分割中的运用

在纹理图像分割的研究领域中j基于人类视觉感知特性的图像分割方法是一个重要的新研究方向,在许多领域都有广泛的应用.基于小波分析理论,实现了图像的纹理分割.该算法首先对原始图像实施二维多分辨率小波分解,得到特征图像;然后对其直方图进行一维小波变换和多阈值选择,生成区域图像.实验表明,通过调整参数:一维小波分解级数S和模糊阈值,能得到图像的最佳纹理分割.     

红外图像阈值分割算法的研究

目标分割是图像处理、计算机视觉及人工智能领域中的一项基本而关键的技术,其目的是为后续的识别、分类、跟踪和检索提供依据.由于红外图像具有对比度低、噪音大,图像模糊等特点,故将遗传算法应用到红外图像阚值分割中.本文对红外图像阈值分割算法进行了综述,对遗传算法在红外图像分割中应用的研究方法,研究现状及其新技术进行了介绍.该算法被用在红外图像处理中,并取得较好效果.     

细胞分割算法研究方法综述

随着现代科技的发展,用计算机处理细胞在医学诊断和医学图像处理领域有着重要的作用.细胞分割是细胞特征提取和细胞识别的基础,从医学图像中分割出精准的细胞图像是目前极具挑战性的课题.在细胞的自动识别的研究中产生了有效的分割算法的需求,人们提出了不同的分割算法根据图像的不同特征,如阈值法,分水岭算法等.本文对细胞分割的各种方法...     

基于编码-解码神经网络遥感图像语义分割应用研究

图像分割的实现经历了从传统方法到神经网络方法的演变。本文从图像分割的发展过程入手,介绍了图像分割与语义分割的区别,对最近几年传统图像分割方法在遥感图像分割领域的应用进行梳理分析,总结了传统遥感图像分割方法的不足。基于此,归纳了几种经典编码-解码神经网络架构在遥感图像语义分割领域的应用,对其改进方式进行了综合性分析,并对其未来的发展趋势进行展望。     

图像分割的新理论和新方法

图像分割是是计算机视觉研究中的一个经典难题,已成为图像理解领域关注的一个热点.本文对近年来图像分割方法的研究现状与新进展进行了归纳总结.首先,简单介绍了图像分割的传统方法,包括基于区域的、基于边缘的和两者结合的图像分割方法.然后,分别从数学形态学、模糊集、神经网络、支持向量机、免疫算法、图论和粒度计算等方面对图像分割方法进行了重点讨论,并对应用每一种理论的最新研究进展作了评述.最后,对图像分割方法的发展趋势进行了展望.     

医学图像的三维自适应迭代分割算法

医学图像分割是医学图像处理分析领域中的研究重点和难点问题,文中对医学CT图像的三维分割方法进行了深入研究,提出了一种医学CT图像的三维分割框架--三维自适应迭代分割算法(SO3DAISA).试验结果表明,本文的分割方法在很大程度上减少了人工干预、执行效率高、图像分割效果好,并且具有很好的实用性.     

基于迭代均值漂移滤波图像分割新算法

图像分割技术在系统计算机视觉领域一直扮演着重要的角色.针对传统的图像分割迭代算法由于过分重视图像分割的精确度,造成算法复杂度大大的增加.为了解决该问题,提出了一种全新的基于迭代均值漂移滤波图像分割方法.算法采用了熵作为停止准则,并使用均值移动跟踪滤波来给出递归实时的分割过程.仿真实验结果表明,提出的迭代均值漂移滤波图像分割能快速的有效的分割图像,不仅可以得到了比较高的分割精度,还大大减少了计算量,一定程度上能够改善图片分割的效率和质量.     

基于深度学习的医学图像分割方法研究进展

医学图像处理技术随着深度学习的兴起而飞速发展。基于深度学习的医学图像分割技术成为了分割领域的主流方法，弥补了传统分割方法分割精度不足的缺点，已被应用到一些病理图像的分割任务中。文中对近年来出现的基于深度学习的分割方法进行了介绍和对比，重点综述了U-Net及其改进模型在分割领域的贡献，归纳了常见的医学图像模态、分割算法的评价指标和常用分割数据集，并对医学图像分割技术的未来发展进行了展望。     

基于深度学习的图像实例分割技术研究进展

随着深度学习算法在图像分割领域的成功应用,在图像实例分割方向上涌现出一大批优秀的算法架构.这些架构在分割效果、运行速度等方面都超越了传统方法.本文围绕图像实例分割技术的最新研究进展,对现阶段经典网络架构和前沿网络架构进行梳理总结,结合常用数据集和权威评价指标对各个架构的分割效果进行比较和分析.最后,对目前图像实例分割技术面临的挑战以及可能的发展趋势进行了展望.     

Level Set方法在雷达图像分割中的应用

LevelSet方法在图像分割领域应用非常广泛,尤其是在医学图像中。这里将LevelSet方法用到雷达图像分割中,首先用电场力模型对雷达图像进行预处理,使图像变平滑,将原图像平面映射到电场力模型平面,然后对预处理后的图像用LevelSet的快速算法FastMarching进行分割。经电场力模型预处理后的分割图像较平滑,而且噪点明显减少,实验证明了方法的有效性。     

Spatial-domain image hiding using image differencing

A method to embed a secret image into a cover image is proposed. The method is based on the similarity among the grey values of consecutive image pixels as well as the human visual system's variation insensitivity from smooth to contrastive. A stego-image is produced by replacing the grey values of a differencing result obtained from the cover image with those of a differencing result obtained from the secret image. The process preserves the secret image with no loss and produces the stego-image with low degradation. Moreover, a pseudorandom mechanism is used to achieve cryptography. It is found from experiment that the peak values of signal-to-noise ratios of the method are high and that the resulting stego-images are imperceptible. Even when the size of the secret image is about a half of the cover image     

基于多层级图像分解的图像融合算法

不同类型的探测器在成像机理上有不同的侧重点,使得成像图像表征的信息也有所不同,导致单幅图像不能完整地反映场景的有效信息。因此,提取多源图像的互补信息,并去除其中的冗余信息,合成一幅能准确、完整表达场景的复合图像的技术成为了图像处理领域中一项非常重要的技术,图像融合正是这类问题的一种有效解决方法。针对传统多尺度分解的图像融合方法易产生噪声和信息缺失的现象,文中提出了一种基于多层级图像分解的红外与可见光图像融合算法。首先,利用加权平均曲率滤波的边缘保持特性与高斯滤波的平滑特性,构建了多层级图像分解模型。在利用该模型将源图像分解为小尺度层、大尺度层和基层等3个不同层级。然后,针对基层,采用能量属性融合策略进行融合;针对大尺度层,采用复合融合策略进行融合;针对小尺度层,采用最大值融合策略。最后,将融合后的层级进行加和,以重构出最终的融合图像。实验结果表明:文中提出的基于多层级图像分解的图像融合算法能够有效降低噪声产生的概率,同时减少了融合后的信息缺失。     

基于图像增强和复原的图像去雾方法研究

雾霭等天气下获得的图像存在对比度低、颜色退化、景物模糊等一系列图像退化的问题,直接影响了对图像信息的有效利用。因此,对雾天图像进行有效的去雾处理,有效改善降质图像的质量,具有一定的实际意义。分析讨论基于图像增强的多尺度Retinex算法和利用图像复原原理的基于暗原色先验理论的去雾算法,并对具有不同特点的单幅有雾图像进行去雾仿真。实验结果表明,不同理论基础的两种去雾算法各有特点,基于暗原色理论处理得到的图像去雾效果更显著,算法运行速度更快。     

Blind image deconvolution for single motion-blurred image

Motion blur due to camera shake during exposure is one of the most common reasons of image degradation,which usually reduces the quality of photographs seriously.Based on the statistical properties of the natural image's gradient and the blur kernel,a blind deconvolution algorithm is proposed to restore the motion-blurred image caused by camera shake,adopting the variational Bayesian estimation theory.In addition,the ring effect is one problem that is not avoided in the process of image deconvolution,and usually makes the visual effect of the restored image badly.So a dering method is put forward based on the sub-region detection and fuzzy filter.Tested on the real blurred photographs,the experimental results show that the proposed algorithm of blind image deconvolution can remove the camera-shake motion blur from the degraded image effectively,and can eliminate the ring effect better,while preserve the edges and details of the image well.     

Underwater image enhancement with image colorfulness measure

Due to the absorption and scattering effects of the water, underwater images tend to suffer from many severe problems, such as low contrast, grayed out colors and blurring content. To improve the visual quality of underwater images, we proposed a novel enhancement model, which is a trainable end-to-end neural model. Two parts constitute the overall model. The first one is a non-parameter layer for the preliminary color correction, then the second part is consisted of parametric layers for a self-adaptive refinement, namely the channel-wise linear shift. For better details, contrast and colorfulness, this enhancement network is jointly optimized by the pixel-level and characteristic-level training criteria. Through extensive experiments on natural underwater scenes, we show that the proposed method can get high quality enhancement results.     

Dual-branch deep image prior for image denoising

In this work, we propose a two-stage denoising approach, which includes generation and fusion stages. Specifically, in the generation stage, we first split the expanding path of the UNet backbone of the standard DIP (deep image prior) network into two branches, converting it into a Y-shaped network (YNet). Then we adopt the initial denoised images obtained with DAGL (dynamic attentive graph learning) and Restormer methods together with the given noisy image as the target images. Finally, we utilize the standard DIP on-line training routine to generate two complementary basic images, whose image quality is quite improved, with the help of a novel automatic iteration termination mechanism. In the fusion stage, we first split the contracting path of the standard UNet network into two branches for receiving the two basic images generated in the previous stage, and obtain a fused image as the final denoised image in a fully unsupervised manner. Extensive experimental results confirm that our method has a significant improvement over the standard DIP or other unsupervised methods, and outperforms recently proposed supervised denoising models. The noticeable performance improvement is attributed to the proposed hybrid strategy, i.e., we first adopt the supervised denoising methods to process the common content of images substantially, then utilize the unsupervised method to fine-tune the specific details. In other words, we take full advantage of the high performance of the supervised methods and the flexibility of the unsupervised methods.     

Prototype image constraints for set-theoretic image restoration

Constraints based on prototype images are developed and used in set-theoretic image restoration. A prototype can be obtained as a result of applying a predetermined operator to the observed image. In this case, the operator and the bound, which limits the variation of the restored image from the prototype, are the two defining quantities of a prototype constraint. General guidelines for rigorously estimating the defining bound of a prototype constraint under certain simplifying conditions are discussed. The authors provide two examples of prototype constraints where the prototypes are obtained by the Wiener filtering operator and a local averaging operator. The projection onto convex sets algorithm using the prototype constraints is applied to both monochrome and color images degraded by out-of-focus blur at different noise levels. The results show significant improvement over the Wiener restoration in reducing the restoration artifacts     

利用反演可见光图像的方法实现红外图像的获取

为了取得较逼真的红外图像,提出了一种利用可见光图像反演红外图像的新方法.首先,将可见光图像分割为"物体"和"大气"两个区域,由各区域与环境辐射的关系计算出在特定波段内进入仿真红外热像仪的总辐射出射度.然后,模拟红外热像仪的内部工作参数,根据红外热像仪的工作原理计算出各区域自身的辐射出射度,从而得到各区域的温度值.最后,由红外图像温度值与灰度值的映射关系,将各区域的温度值以灰度值的形式表现出来,即得到了仿真的红外图像.实验结果表明,此方法可有效地提高反演效果,具有较强的实用性.