共查询到18条相似文献,搜索用时 125 毫秒
1.
2.
CMOS相机是一种重要的固体成像设备。随着科研级CMOS相机的性能不断提高,现已广泛应用于科研领域。新真空太阳望远镜的成像设备也使用CMOS相机,因此建立一个天文CMOS相机测试系统,对于新购CMOS相机的验收以及现有CMOS相机的定期检测和维护有十分重要的意义。介绍了CMOS相机测试平台的硬件组成,并针对实际测试中对设备控制的需求,以及利用控制器对相应的设备直接控制,提出了基于TCP/IP协议以及串口通信的设计方案,利用C#编程语言设计了一套多线程并行的控制系统软件,实现各设备在局域网内的远程并行控制。通过对设备的运行测试,结果表明,系统能良好地控制各设备的正常运行,满足测试系统集成控制的需求。 相似文献
3.
4.
5.
自动成像协会(AutomatedImagingAssociation,AIA)在2013年初发布了用于高速图像数据传输的USB3Vision标准。首先简要介绍了基于该标准的EMCCD相机高速数据传输系统的设计方案,重点介绍了传输系统的构建和图像采集软件的设计。其中,传输系统的构建主要是在QUARTUSII的开发环境下,移植EMCCD相机数字控制器,使用VHDL语言编程设计一个控制器,产生USB3.0芯片USB3014的读写时序以及相关的逻辑信号,并且完成模拟图像产生和针对USB3Vision标准的数据传输格式转换的功能;图像采集软件的编写是在VS2010开发环境下利用CYPRESS公司提供的应用程序接151(API),采用c++语言实现。最后进行了模拟图像的采集实验,并且进行了误码率估算。 相似文献
6.
自动成像协会(Automated Imaging Association,AIA)在2013年初发布了用于高速图像数据传输的USB3 Vision标准。首先简要介绍了基于该标准的EMCCD相机高速数据传输系统的设计方案,重点介绍了传输系统的构建和图像采集软件的设计。其中,传输系统的构建主要是在QUARTUS II的开发环境下,移植EMCCD相机数字控制器,使用VHDL语言编程设计一个控制器,产生USB3.0芯片USB3014的读写时序以及相关的逻辑信号,并且完成模拟图像产生和针对USB3 Vision标准的数据传输格式转换的功能;图像采集软件的编写是在VS2010开发环境下利用CYPRESS公司提供的应用程序接口(API),采用C++语言实现。最后进行了模拟图像的采集实验,并且进行了误码率估算。 相似文献
7.
8.
9.
10.
在高速有限冲击响应(Finite Impulse Response,FIR)数字滤波器的设计中,随着滤波器阶数的增加,保持数据流速率和有效使用硬件资源成为设计的一个重点和难点。基于高速并行有限冲击响应数字滤波器的基本原理,提出了一种将位平面法、正则有符号系数(Canonical-Signed Digit,CSD)编码算法和抽取算法应用于并行有限冲击响应数字滤波器的改进方法。设计通过Matlab仿真,在Quartus II中编译、仿真、综合后下载到现场可编程门阵列(Field Programmable Gate Array,FPGA)中进行测试,结果显示,这种改进方法较好地解决了滤波器阶数和数据流速率与硬件资源之间的关系。 相似文献
11.
SUN Rong-yu ZHAO Chang-yin PING Yi-ding XIONG Jian-ning ZHANG Chen 《Chinese Astronomy and Astrophysics》2012
In the observation of space objects with a full-frame transfer CCD camera, the camera shutter is often removed, and therefore the smeared images are produced, which affect seriously the object detection and location. Based on the difference of geometrical morphology between star images and smears, a mathematical morphology method is proposed to process the smeared images. By comparing the position accuracies of stars and space objects before and after processing, it is veri?ed that the morphological method can effectively remove the smears from astronomical images, and can signi?cantly improve the detection rates and position accuracies of stars and moving objects. The result indicates that this is an effective method to eliminate the smearing effect. 相似文献
12.
13.
L. Győri 《Solar physics》2010,267(2):445-461
Accurate heliographic coordinates of objects on the Sun have to be known in several fields of solar physics. One of the factors
that affect the accuracy of the measurements of the heliographic coordinates is the accuracy of the orientation of a solar
image. In this paper the well-known drift method for determining the orientation of the solar image is applied to data taken
with a solar telescope equipped with a CCD camera. The factors that influence the accuracy of the method are systematically
discussed, and the necessary corrections are determined. These factors are as follows: the trajectory of the center of the
solar disk on the CCD with the telescope drive turned off, the astronomical refraction, the change of the declination of the
Sun, and the optical distortion of the telescope. The method can be used on any solar telescope that is equipped with a CCD
camera and is capable of taking solar full-disk images. As an example to illustrate the method and its application, the orientation
of solar images taken with the Gyula heliograph is determined. As a byproduct, a new method to determine the optical distortion
of a solar telescope is proposed. 相似文献
14.
《天文和天体物理学研究(英文版)》2014,(8)
In order to implement an observing strategy,image degradation that occurs during optical observation of space debris is ineluctable and has distinct characteristics. Image restoration is presented as a way to remove the influence of degradation in CCD images of space debris,based on assumed PSF models with the same FWHM as images of the object. In the process of image restoration,the maximum entropy method is adopted. The results of reduction using observed raw CCD images indicate that the precision in estimating positions of objects is improved and the effects of degradation are reduced. Improving the astrometry of space debris using image restoration is effective and feasible. 相似文献
15.
《Chinese Astronomy and Astrophysics》2022,46(2):86-104
Geosynchronous satellite with big inclination is not completely stationary relative to the ground. Its sub-satellite point moves periodically in the north-south direction with ground track of shape like “8”. The larger the inclination angle is, the larger the range of motion is. Such effect makes the effective exposure time of Geosynchronous satellite limited when observe it by optical telescope with stare mode, and the SNR (Signal Noise Ratio) of Geosynchronous satellite image could not be increased with long exposure time. In the monitoring of Geosynchronous orbit without changing hardware, a method called sub-pixel translating superposition of successive frames of images is proposed. By translating and aligning images in the sub-pixel scale according to the moving speed of the object and the time interval of the adjacent frame images, the positions of the Geosynchronous satellite in the image sequences are coincident, and then by superposition of these translational images, the SNR of moving Geosynchronous objects and the detection capability of the whole system can be improved. Results of superposition of real observed images show that the method can remarkably improve the SNR of moving. When five images are superimposed, compared with the SNR of the original image, the SNR of the superimposed image by integer pixels is increased by around 1.7 times, and the SNR of the superimposed image by sub-pixel is increased by about 2 times. 相似文献
16.
针对嫦娥二号探测器在轨运行阶段的仿真需求,充分发挥视景仿真的优势,利用嫦娥一号探测器获得的地形和影像数据、日地月嫦娥二号探测器星历数据,基于OSG(OpenScene Graph)设计了针对嫦娥二号任务的在轨运行视景仿真系统。论述了该系统的开发平台,系统总体框架,并对系统的实现进行了详细描述。论述了月球模型数据构建,嫦娥二号探测器构建,星历数据库构建与访问,仿真实体空间位置的实时更新,CCD立体相机探测过程的仿真,视点的控制等实现方法。仿真结果表明系统完全能满足嫦娥二号任务在轨运行仿真的要求,并已应用于嫦娥二号任务执行过程中。 相似文献
17.
大倾角地球同步轨道(GEO)卫星相对地面并非完全静止,其星下点做南北方向的"8"字周期运动,倾角越大运动范围越大.这会降低地面望远镜对其进行凝视观测时的有效曝光时间,无法获得较高的信噪比.对地球同步轨道的监测中,在硬件条件不变的前提下,提出亚像素图像平移叠加方法.根据目标的运动速度和相邻帧图像的时间间隔,在亚像素尺度平移并对齐多幅图像,使GEO目标星象在图像序列中的位置重合,通过叠加多幅序列图像来提高目标信噪比,从而达到提升整个系统探测能力的目的.实测图像叠加结果表明,该方法可以显著提高该类目标的信噪比.叠加5幅图像时,整数像素叠加图像的信噪比约为原图像的1.7倍,而亚像素叠加图像的信噪比是原图像的2倍左右. 相似文献
18.
R. L. Hawkes P. G. Brown N. R. Kaiser A. J. Faloon K. A. Hill L. A. Rogers 《Earth, Moon, and Planets》2004,95(1-4):587-593
A digital image intensified CCD camera with an electronically gated image intensifier was used to produce very short duration
images of meteors. The observational system employed a 0.40 m F/4.5 Newtonian telescope to obtain high spatial resolution.
A second intensified CCD camera was used to yield height information using parallax. At a typical meteor height one pixel
(for the vertically oriented system) corresponded to about 1.1 m. A sampling of 59 mainly sporadic meteors was analyzed. There
is clear variability from meteor to meteor, with many meteors (nearly 50%) showing only a small amount of wake, while some
meteors (approximately 20%) have the off segments completely filled in. 相似文献