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1.
A Theory of Shape by Space Carving   总被引:9,自引:9,他引:21  
In this paper we consider the problem of computing the 3D shape of an unknown, arbitrarily-shaped scene from multiple photographs taken at known but arbitrarily-distributed viewpoints. By studying the equivalence class of all 3D shapes that reproduce the input photographs, we prove the existence of a special member of this class, the photo hull, that (1) can be computed directly from photographs of the scene, and (2) subsumes all other members of this class. We then give a provably-correct algorithm, called Space Carving, for computing this shape and present experimental results on complex real-world scenes. The approach is designed to (1) capture photorealistic shapes that accurately model scene appearance from a wide range of viewpoints, and (2) account for the complex interactions between occlusion, parallax, shading, and their view-dependent effects on scene-appearance.  相似文献
2.
暗原色先验单幅图像去雾改进算法   总被引:9,自引:5,他引:4  
目的为解决传统基于暗原色先验的单幅图像去雾算法实现效率低以及恢复雾化图像在天空、白云等明亮区域颜色失真的不足,提出一种改进算法。方法通过分块思想,完成透射率的空间自适应估计;通过判断大气光强度和暗通道差值绝对值大小来判断雾图中是否含有明亮区域。结果该算法不仅降低了传统算法的时间复杂度,而且弥补了传统算法在明亮区域透射率估计的不足。结论实验结果表明该改进算法可行、有效。  相似文献
3.
视频安保系统中人脸的快速检测和定位   总被引:8,自引:8,他引:6  
文章提出了一种在实时视频安保系统图像中快速检测人脸和定位人脸的方案.并利用VC 6.0设计了一套基于PC机的软件将其实现。对摄像机实时采集的图像.首先利用差分检测的方法,剔除大部分背景区域,然后利用肤色检测准确定位人脸。实验证明该方法快速、有效适用于实际的视频安保系统。  相似文献
4.
高阶矩在颜色传输中的应用   总被引:6,自引:6,他引:24  
图像之间的颜色传输有效地利用了图像的基本统计信息,是一类较新的改变图像颜色的方法.文中实现了这种方法并引入了更高的矩:斜度和峰度.利用幂变换和模变换对源图像数据的斜度和峰度等高阶矩进行了调整,使之更加类似于目标图像的分布,使图像之间颜色传输的效果更好。  相似文献
5.
综合MPEG-7中颜色特征的图像检索方法*   总被引:5,自引:5,他引:14  
提出一种综合MPEG-7建议的主颜色和颜色布局的方法。给出了主颜色和颜色布局的提取方法,详细介绍了MPEG-7标准的颜色评价准则,并以此作为评判检索结果优劣的依据。综合利用两种特征对图像进行描述及检索,获得了比使用单一特征更好的检索效果。  相似文献
6.
遥感多光谱影像空间分解力增强的融合方法   总被引:4,自引:4,他引:27       下载免费PDF全文
探讨了采用HIS变换对遥感多光谱影像与航片数字化影像进行融合的方法。试验结果表明所提出的方法是确实可行的。融合后的影像不仅在很大程度上保留了原多光谱影像的光谱特征,而且将其空间分解力提高到原光谱影像的近3倍,因而增强了多光谱影像的判读和量测能力。  相似文献
7.
Automatic Detection of Human Nudes   总被引:4,自引:4,他引:16  
This paper demonstrates an automatic system for telling whether there are human nudes present in an image. The system marks skin-like pixels using combined color and texture properties. These skin regions are then fed to a specialized grouper, which attempts to group a human figure using geometric constraints on human structure. If the grouper finds a sufficiently complex structure, the system decides a human is present. The approach is shown to be effective for a wide range of shades and colors of skin and human configurations. This approach offers an alternate view of object recognition, where an object model is an organized collection of grouping hints obtained from a combination of constraints on color and texture and constraints on geometric properties such as the structure of individual parts and the relationships between parts. The system demonstrates excellent performance on a test set of 565 uncontrolled images of human nudes, mostly obtained from the internet, and 4289 assorted control images, drawn from a wide variety of sources.  相似文献
8.
We extend the geometric framework introduced in Sochen et al. (IEEE Trans. on Image Processing, 7(3):310–318, 1998) for image enhancement. We analyze and propose enhancement techniques that selectively smooth images while preserving either the multi-channel edges or the orientation-dependent texture features in them. Images are treated as manifolds in a feature-space. This geometrical interpretation lead to a general way for grey level, color, movies, volumetric medical data, and color-texture image enhancement.We first review our framework in which the Polyakov action from high-energy physics is used to develop a minimization procedure through a geometric flow for images. Here we show that the geometric flow, based on manifold volume minimization, yields a novel enhancement procedure for color images. We apply the geometric framework and the general Beltrami flow to feature-preserving denoising of images in various spaces.Next, we introduce a new method for color and texture enhancement. Motivated by Gabor's geometric image sharpening method (Gabor, Laboratory Investigation, 14(6):801–807, 1965), we present a geometric sharpening procedure for color images with texture. It is based on inverse diffusion across the multi-channel edge, and diffusion along the edge.  相似文献
9.
彩色图像分割方法综述   总被引:4,自引:4,他引:139       下载免费PDF全文
由于彩色图像提供了比灰度图像更为丰富的信息,因此彩色图像处理正受到人们越来越多的关注。彩色图像分割是彩色图像处理的重要问题,彩色图像分割可以看成是灰度图像分割技术在各种颜色空间上的应用,为了使该领域的研究人员对当前各种彩色图像分割方法有较全面的了解,因此对各种彩色图像分割方法进行了系统论述,即先对各种颜色空间进行简单介绍,然后对直方图阈值法、特征空间聚类、基于区域的方法、边缘检测、模糊方法、神经元网络、基于物理模型方法等主要的彩色图像分割技术进行综述,并比较了它们的优缺点,通过比较发现模糊技术由于能很好地表达和处理不确定性问题,因此在彩色图像分割领域会有更广阔的应用前景。  相似文献
10.
Since their introduction as a means of front propagation and their first application to edge-based segmentation in the early 90’s, level set methods have become increasingly popular as a general framework for image segmentation. In this paper, we present a survey of a specific class of region-based level set segmentation methods and clarify how they can all be derived from a common statistical framework. Region-based segmentation schemes aim at partitioning the image domain by progressively fitting statistical models to the intensity, color, texture or motion in each of a set of regions. In contrast to edge-based schemes such as the classical Snakes, region-based methods tend to be less sensitive to noise. For typical images, the respective cost functionals tend to have less local minima which makes them particularly well-suited for local optimization methods such as the level set method. We detail a general statistical formulation for level set segmentation. Subsequently, we clarify how the integration of various low level criteria leads to a set of cost functionals. We point out relations between the different segmentation schemes. In experimental results, we demonstrate how the level set function is driven to partition the image plane into domains of coherent color, texture, dynamic texture or motion. Moreover, the Bayesian formulation allows to introduce prior shape knowledge into the level set method. We briefly review a number of advances in this domain.  相似文献
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