visibility function

Based on the traditional ant colony algorithm , we adjust the evaporation coefficient ρ adaptively , adopt new heuristic rules to define the visibility function η ij ( t ) and update table allowed in a different way .

在传统的蚁群算法的基础上自适应调整挥发系数ρ，采用了新的启发式规则定义能见度函数ηij（t），allowed表的更新也有所不同。

The integral expression , ( 6 ), of the visibility function , on which the effect of the atmosphere is considered , is derived in this paper .

本文在考虑了大气影响的条件下、导出了可见度函数的积分表达式，（6）。

Analysis of the Phase Terms in the Visibility Function

可见度函数中的相位分析

Research of the coverage performance of satellite constellation using visibility function

通过使用一系列球面谐函数来近似表示这二维全视函数，从而实现滤波环境映照的快速计算。视函数法分析卫星覆盖研究

GPS visibility function picture and coverage performance are obtained , and coverage quality is evaluated .

给出了GPS星座的视函数图，累积出覆盖统计特性，并且评价了覆盖质量。

According to the principle of visibility function and the method of earth center , numerical simulation approach is built .

根据视函数法和地心法，建立了星座覆盖性能评定的数值仿真方法。

In this process , phase errors of the visibility function will sharply degrade the imaging quality .

成像中可视度的相位误差对成像质量影响很大。

For the technique treatment , we improve the decaying factor coming from the Fourier transformation of visibility function .

在技术处理方面，我们改进了由于可视函数的Fourier变换所得到的衰减因子。

At last , we utilize the some characteristic of the picture and put forward a kind of the second generation watermark algorithm based on noise visibility function .

最后以第二代水印技术为基础，利用图像的局部特征，提出一种基于噪声可见性函数的彩色图像水印算法。

Visibility function is the sampled value in space frequency field which should be inserted in a symmetrical grid before making Fourier inverse-transformation .

可视度函数是空间频域的采样值，在做Fourier逆变换之前需要将样本点插到一个均匀的网格上。

When the scale of the synthetic beam is larger than that of the source distribution , the unsymmetrical parameters induce also the phase term of the visibility function .

当综合射束的尺度较源的尺度为大时，源分布的不对称性也可引出可见度函数的相位。

This paper presents a watermarking capacity analysis method based on the content of wavelet subbands by using Watson quantization matrix and noise visibility function ( NVF ) .

提出了一种基于小波子带的内容，利用Watson量化矩阵和噪声可见性函数对水印的嵌入功率进行自适应限定的水印容量分析方法。

In the preprocessing stage of secret image , using the noise visibility function to the local characteristics of cover images , using visual quantification to get the preprocessing secret image .

在秘密图像的预处理阶段，结合噪声可见性函数对载体图像进行局部特性分析，采用视觉量化的预处理方式得到预处理后的秘密图像。

The HVS model is based on the computation of the noise visibility function ( NVF ) and embed at the texture and edge region stronger embedded watermarks .

模型基于噪声可见性函数（NVF）的计算来决定水印嵌入强度，使水印更多的嵌入到图像的纹理和边缘区域。

Secondly , the independent component analysis ( ICA ) and the noise visibility function ( NVF ) are introduced . So a algorithm based on noise visibility function and the independent component analysis of steganography was proposed .

其次，介绍了独立分量分析（ICA）和噪声可见性函数（NVF），在此基础上提出了一种基于噪声可见性函数和独立分量分析的数字密写算法。

The phase caused by the primary effect of the atmosphere compared with the basic phase of the visibility function is considerable , even though for a shorter base line . This fact results from the use of the phase rotation technique .

即使基线较短时，大气的一级效应所引起的相位与可见度函数的基本相位比较，仍是一个不可忽视和数量，之所以如此，是由于使用了相位旋转技术。

A perceptual model based on the computation of NVF ( noise visibility function ) is exploited in the proposed watermarking scheme . The characteristics of the original image are shown by using the NVF , and the embedding depth is decided by the model .

算法中引入了基于噪声可见函数（NVF）的感知模型来描述图像的局部特征，并根据此模型决定水印信息的嵌入深度。

That means that they should include the abstract keyword , optionally a visibility modifier , the function keyword , and an optional list of arguments in parentheses .

这意味着，抽象方法应包括abstract关键字、可选的可见度修改符、function关键字，以及圆括号内可选的参数列表。