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- Keywords digital watermark;spatial domain transforming;human vision system;presswork of preventing falsification; 数字水印;空间域变换;人类视觉系统;防伪印刷;
- spatial domain transforming 空间域变换
- Firstly, Local Walsh Transform (LWT) is defined and generalized in spatial domain to extract local texture information. 首先给出局部沃尔什变换(LWT)的定义，并在空域中对其加以推广，用以提取图像的局部纹理信息；
- Interferogram region spreading technology in spatial domain[J]. 引用该论文 苏俊宏;陈磊;朱日宏.
- Discrete fourier transform ( DFT) was introduced into the spatial domain signal processing to analyse and process the uniformly spaced linear array signals, and a method to extract the DOA of signal was presented. 将离散傅里叶变换(DFT)引入到空域信号处理中;对等距线阵接收的信号进行了分析和处理;提出了一种提取信号来波方向的方法.
- An effective depth to time domain transforming method is presented to improve normal sample method. 提出了一种有效的对常规采样方法改进的深时转换方法。
- A digital image watermarking scheme embedded in spatial domain based on BSS (blind source separation) was proposed. 摘要提出了一种基于盲源分离理论的时空域嵌入的数字图像水印算法。
- The watermark is designed in a cirque pattern and it is embedded in spatial domain using odd-even quantization. 设计了一种圆环形的水印模式，并在空域采用奇偶量化嵌入水印；
- Simulation results reveal that global stability and creditability of GALILEO are superior to GPS in temporal and spatial domain. 仿真结果表明,在中国大陆范围内,galileo系统在时间域和空间域上的整体稳定性优于GPS系统。
- A second strand in the super-resolution story,developing in parallel to the first,was based purely in the spatial domain. 中的一个超分辨率的故事第二个组成部分，同时向第一个发展中国家，是基于纯粹的空间域。
- Image enhancement in spatial domain, the sources include histogram, laplacian, unsharp mask, and spatial filter has been tested. (译)：图像增强在空间领域，来源包括直方图，拉普拉斯，锐化遮罩和空间滤波器进行了测试。
- But resampling in the frequency domain will causes replicas occur in the spatial domain if we do not use any reconstruction filter. 但是它会有频域空间再取样的问题，导致重叠影像的失真现象，因此滤波器的设计对傅立叶立体资料描绘法是非常重要的研究主题。
- From which z's domain to the domain transform their own preparation, instead of MATLAB system BUTTERWORTH system function (for graduate design students more useful! 这是一个基于MATLAB编写的BUTTERWORTH滤波器的程序.;其中从s域到z域的变换是自己编写的;代替了MATLAB中的系统BUTTERWORTH的系统函数(对于毕业设计的学生;比较有用!!
- Through the analysis of many representative spatial domain watermark algorithms, a new spatial domain digital watermark imbedding algorithm is presented. 通过对多种空域水印算法优缺点的分析,提出了一种新的空域数字图像水印加入算法。
- From principle, we use the Fourier method to compare the information consistency in the spatial domain and frequency domain for traditional X-ray, CT and Tomosynthesis device. 从原理层面,基于对不同X-ray医疗设备(传统X-ray,计算机断层扫描CT,运动成像Tomosynthesis)采集信息完备程度的分析,分别从空间域和频率域的角度论证了信息完备性程度的一致性。
- It encodes the bitplane of spatial domain image byquadtree encoded, shuffles and selectively encrypts the data according to the structure of quadtree encoding. 对空域图像位平面采用四叉树编码,根据四叉树编码的结构特点对数据进行置乱和选择加密,对加密算法进行加密数据量分析和安全性评估。
- The study showed that spatial domain filers have difficulties in reserving good edge and texture information at the same time reducing speckles, so they have to make a compromise. 空间域的滤波处理，很难达到在消除相干斑噪声的同时又能很好地保留边缘和纹理细节的理想状态。一般只能在相干斑噪声消除和边缘信息保留两个方面进行折衷。
- But as for the non-stationary signal, this tool is not useful because it is a fully time domain or fully frequency domain transform, it cannot provide the frequency information at any local time segment. 但对非平稳信号来说，这种工具就显得力不从心。 因为它是一种全频域、全时域的变换，它将信号从时域变换到了频域，在频域的定位性是完全准确的(即频域分辨率最高)，但其在时域却无任何分辨能力，不能提供任何局部时间段上的频率信息。
- Through the analysis of many representative spatial domain watermarking algorithm, a novel image spatial domain blind watermarking algorithm was presented. 通过对多种空域水印算法优缺点的分析,提出了一种新的图像空域盲水印算法。
- The first step, the infrared imageconverted from spatial domain to fuzzy field, then itenhanced by homomorphic filtering, at last, the processed image is obtained. 该方案首先将红外图像由空域平面转换成模糊域（特征）平面，然后再对其进行同态增强，最终经去模糊得到处理后的图像。
