天空背景

介绍了白天天空背景下，在大气层内用CCD探测恒星可探测极限星等值的计算方法。

The method to estimate the detectable stellar magnitude limit in daytime sky background is introduced .

复杂天空背景下基于GST的红外斑点小目标检测

Detection of infrared spot small targets against complex sky background by using GST

地面气溶胶（能见度和气溶胶类型）对天空背景Tb有明显的影响，必须加以订正。

The influence of aerosol ( visibilities and aerosol types ) above the ground on the sky Tb cannot be neglected , which must be corrected .

提出了基于MORTRAN软件的修正完善方法，建立了全天空背景亮度数据；

Based on the MORTRAN software , a corrected method to consummate the all-sky background brightness is given .

建立了LBS-1型立靶精度测量系统中的天幕靶，对天幕靶探测性能存在的各种影响因素，如：光电转换接收器件及其探测电路、天空背景亮度的强弱等进行了分析。

A LBS-1 fire accuracy measurement system was set up . Influence factors including detection circuit of photo-electricity transforming and accepting , and brightness of sky background , were analyzed .

实现了三维天空背景的实时漫游。

Finally , the roamed 3D sky background was realized .

天空背景的真实感对用户来说能大大提高视觉享受和沉浸感。

The sky background corporeality for users can greatly increase the visual enjoyment and immersed sense .

本文着重对天空背景和复杂海天、海面背景下的弱小目标检测算法进行了深入研究。

This thesis researches the detection algorithm of small target under sky background and sea-sky background .

天空背景亮度的观测

Brightness of the sky background

对复杂的天空背景，则借鉴太阳辐射学中研究大气对太阳辐射的散射辐射强度的方法，导出了计算天空光谱辐射亮度的公式。

With the respect of complex sky background , the sky spectrum radiated luminance formula is set up .

研究了天空背景下红外运动小目标的检测与识别。

The detection and recognition of infrared moving small target in a sky background is considered in this paper .

通过对去除了海背景的天空背景部分进行空域匹配滤波，获得了较好的实验效果。

The analysis of experiment results indicates the effect of spatial matched filtering based on background segmentation is very good .

对大气透过率和天空背景辐射进行了初步分析，指出高度为其最主要影响因素。

Fundamental analysis of atmospheric transmission sky background radiance is carried out , height is regarded as the key factor .

对0.45-0.95μm波长范围内，天空背景光谱亮度随气溶胶种类、波长、能见度及观察天顶角的变化作了数值计算和理论分析。

The theoretic analysis of spectral properties varied with aerosol kinds , wavelength , visual distance and observational azimuth is presented .

实现了以地面观测站为观测视点的场景显示，地面以及天空背景显示，卫星及卫星轨迹显示。

Realize the render of scene based on the ground viewpoint , including the render of sky background , satellite ana satellite track .

实践证明，该方法可以较大程度地保留图像中小目标对象的频率信息，基本做到天空背景中处理质量较好，海杂波背景中保证小目标不丢失。

Experimental results show that our method can keep good filtering property in the sky background , and the target losing in the sea clutter .

比如当画面上的树叶在亮色天空背景下摇曳时，叶片的边缘部分会出现光点。

For example , when tree leaves are blowing in the wind , the leaves may appear to artificially shimmer at the edges of the leaves .

实验及结果分析表明，基于中值滤波和多向梯度搜索目标检测算法能实时有效地检测出复杂天空背景下的红外弱小目标。

The results of some physical experiments showed that this method can detect the weak and small infrared target under complex background effectively in real time .

对五组实际红外图像序列目标检测的实验结果表明，算法能稳定检测出多类天空背景中的目标。

The usefulness of the algorithm is tested using five kinds of real-world IR image sequence with different background characteristics and proved to be effective and robust .

基于最小分辨对比度准则，研究了天空背景下红外点目标的最大探测距离估计方法。

This paper investigates the approach to estimate the maximum detection range of an infrared point_target against sky background based on the minimum resolved contrast ( MRC ) criteria .

在分析海空背景图像海背景和天空背景灰度分布差异的基础上，提出了基于行均值的海空背景分割算法；

According to the difference of grayness distributing between sea background and sky background , a method of sea-sky background segmentation based on row mean value has been raised .

天空背景的研究主要根据天空颜色的变化规律，提出符合这一规律的特征函数，计算出不同位置的天空背景颜色和亮度。

On the research of sky background , this paper advances characteristic functions based on the analysis of the variations in sky color and implements the color computation of different vertex on the sky dome .

分析了天空背景下彩色飞机图像的颜色概貌，提出了根据颜色特征来检测飞机目标，重点在于如何得到最佳的颜色特征。

This paper analyzes the color situation of the color plane image under the sky background , proposes detecting plane goal according to color characteristic and focuses on how to receive the best color characteristic .

单从本论文内容上看，主要分为两个方面：下垫面在对空观测中的影响，以及天空背景仿真软件开发。

From the content of the paper , it can be made of two parts : One is the radiative transfer on surface , and the other is the designing of the emulating-software on sky background .

然后，对目标天空背景温差、发射率，气溶胶衰减系数，瞬时视场、对比度探测阈值以及辐射波长等参数作了详细讨论。

Secondly , other parameters such as temperature difference and emissivity of target and sky , molecular absorptive transmittance , instantaneous field of view ( IFOV ), contrast threshold and radiant wavelength are discussed in detail .

天空背景下红外小目标图像的分割与聚类是检测和识别目标过程的预处理部分。

The segmentation and clustering of infrared small target image in a sky background is considered in this paper , which is the preprocessing part of the detection and recognition of moving small target in an infrared image sequence .

通过实验证明，本文所提出的动态云模拟算法画面显示流畅，简单快速、效率高，实时性强的特点，可以满足游戏场景等动态天空背景的需要。

The experimental results show that the proposed algorithm for dynamic cloud simulation screen display smooth , simple and fast , efficient and real time features , to meet the needs the dynamic sky background of certain game scene .

通过分析典型地面目标和地物背景、大气、天空背景和太阳的红外辐射特性，建立了红外特性模型、特征预测模型、大气传输模型、天空背景辐射模型和太阳辐射模型。

The infrared radiation characteristics of typical ground targets and backgrounds , atmosphere , sky background and solar are analyzed and the infrared characteristics model , characteristics prediction model , atmosphere transmission model , sky background radiation model and solar radiation model are constructed .

虽然有些虚拟环境以地面的景物作为主要内容，天空背景只是陪衬，但随着技术的发展和使用对象要求的提高，高质量的生成天空背景成为必然的发展方向。

Although some of the environment to the ground as the main content of the landscape , the sky background is a foil , but with the use of object technology and the increasing demand for high quality produce sky background is an inevitable development .

天空背景辐射是影响空间激光通信系统的主要背景噪声，其对大视场，长积分时间的捕获单元影响尤为严重，而快速准确的捕获是建立通信链路的前提。

The sky background radiation is the main background noise of the laser communication system . Especially to the acquisition link which has the big field of view and the long integration . And the rapid acquisition is the premise of establish the communication link .