空域

With curvilinear regression analysis we can prove that the result of the new approach is high correlation with MTF measured by optical instrument, in other words, the new method is sensitive to the change of image definition. When compared with traditional method, the result of analysis can also show that the new method is better than traditional method, such as entropy, to assess gray scale digital image definition.

目前 ，对数字图像清晰度的评价方法主要有空域参数方差、熵以及频域调制传递函数MTF等，但由于这些方法各有优缺点，如空域参数虽评价简洁、快速，但对图像清晰度的细小变化不敏感；频域参数虽对图像清晰度变化敏感，但计算较慢，不宜程序运算的自动化。

Error concealment is used in video communication for compensating the influence of error on image quality. To elminate the mistiness and blocking artifacts in error concealment, a spatial error concealment method based on the SUSAN operator is put forward.

为了消除空域错误隐藏后出现的模糊和块效应，提出了基于SUSAN检测算子的空域自适应错误隐藏算法。

Airspace Image Fusion such as simple fusion method (pixel average, maximal or minimal pixel selection), Frequency-domain image fusion methods include the multiresolution image fusion techniques based on multi-scale pyramid decomposition, and the image fusion method based on wavelet transform Image Pre-processing like Filter processing (neighborhood average filter, median filtering method) and Image Registration.

首先介绍了图像信息融合的概念、优势、发展历史和应用领域，并介绍了图像融合的三个层次及常用的空域图像融合方法，空域融合方法有像素平均法、像素最大最小法、像素加权平均法，频域融合方法包括图像的多尺度分解、图像的小波变换、基于小波变换的图像融合方法。

The closed-form expressions are derived so that all required differentiations are obtained in closed form and numerical differentiation can be avoided.

特别是对微带和缝隙混合结构的空域MoM分析，旋度算子的微分在谱域进行，并可以给出它们的解析表达式，其对应的空域格林函数可通过高阶的Sommerfeld恒等式获得，从而避免了数值微分。

The basic idea is to divide an image into two descriptions with quincunx down-sampling. To tackle the problem of low coding efficiency in the traditional spatial domain multiple description image coding techniques, we propose a directional lifting technique to extensively exploit the correlations among neighboring pixels, in which the lifting directions are selected and organized based on the quad-tree partition.

基本思想是在空域将一幅图像按梅花形下采样为两个描述，为解决传统空域下采样多描述编码技术编码效率低的问题，提出能充分利用相邻像素相关性的方向提升小波变换，并通过四叉树的分割实现方向的组织和选择。

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。

Changsha 410083, China）Abstract: Through the analysis of many representative spatial domain watermarking algorithm, a novel image spatial domain blind watermarking algorithm was presented.

摘 要：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。

Fish eye lens is a kind of reversed telephoto lens having big relative aperture, large view angle and long back working length. Its view angle can reach 180 degree or even more so it can image object covering semisphere or larger than semisphere to limited plane.

鱼眼镜头是一种具有大相对孔径、大视场角和较长的后工作距离的反摄远镜头，它的视场角可以达到甚至超过180°，因此它能够将半球空域甚至超半球空域的物体成象在有限的象平面上。

In order to successfully implement the space domain segmentation, this paper also develops an algorithm that can distinguish connexity between pixels and extract the feature parameters in one image scanning procedure.

为有效地实现图像空域分割，本文提出了一种可在一次图像扫描过程中实现像素连通判别和特征参数提取的图像空域分割算法。

The transmitter takes advantage of the eigenvectors of the SCM of the correlated channels to spread and weigh the signals of each layer. The spatial eigenbeams are formed to carry the signals being spread. The receiver distinguishes the signals from different beams via dispreading operations; therefore co-channel interferences are eliminated effectively.

发射机利用信道空域协方差矩阵的特征矢量，对每一层发射码元进行扩频和特征波束形成加权，形成正交的空域特征波束来承载扩频后的信号码元；接收机则通过解扩处理分离来自不同波束上的信号，有效地抑制了共信道干扰。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。