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1.
在分析复杂天空背景下红外视频序列特征的基础上,针对红外小目标本身特性及红外序列低信噪比的问题,提出适合该环境的红外小目标检测算法.该滤波方法以形态学滤波理论为基础,首先采用均值滤波和Open ing-Tophat运算对红外视频序列进行预处理,然后运用基于均值和方差的统计分割方法提取图像中的运动目标,从而实现了红外小目标的检测.实验结果表明,所提出滤波方法具有良好的检测和分割效果,能够有效地改善跟踪精度.  相似文献   

2.
为了提高低信噪比条件下再生伪码测距系统中的复合伪码时钟恢复性能,采用了一种新型的码片跟踪环.此码片跟踪环是一种改进型的数据转换跟踪环,两者之间的区别在于,码片跟踪环的Q路输出直接乘上了时钟分量,而数据转换跟踪环乘上了I路的转换检测器输出.在准方波伪码测距信号的情况下,详细分析了码片跟踪环的跟踪(均方定时抖动)性能.分析对比了不同码片信噪比条件下的码片跟踪环和数据转换跟踪环跟踪性能.分析表明,码片跟踪环和数据转换跟踪环在大信噪比条件下性能一致;而在小信噪比条件下,码片跟踪环性能明显好于数据转换跟踪环.  相似文献   

3.
提出了一种对噪声背景下微弱正弦信号的检测方法.分析了Duffing振子用于微弱正弦信号检测的机理,并把混沌临界状态检测法和传统检测方法(取样积分)相结合,实现-50dB以下超低信噪比的微弱正弦信号检测.同时,仿真实验也表明该方法对噪声具有较强的抑制能力且具有较低的信噪比工作门限.  相似文献   

4.
在军事上,利用移动机器人跟踪前方的引导员,在野外复杂环境中完成后勤运输与救援任务有重要的意义.针对野外复杂环境这个应用背景,提出了一个基于红外标志点的视觉跟踪系统,该系统有效的解决了传统的视觉跟踪方法受周围环境影响而不能够准确的识别跟踪对象的缺陷;针对传统的标志点识别采用全局搜索的方法计算量大、实时性差的缺陷,提出了一种基于Kalman滤波器预测的红外标志点的识别方法,该方法较传统的标志点识别方法识别速度提高了93%.  相似文献   

5.
随着android系统、无线网络等新技术的发展,智能家居已悄然走入大众视野,智能监控作为配套的解决方案也被广泛推广.该文所设计的系统使用背景建模、更新等技术对目标进行检测与跟踪,排查分析可疑目标对象,通过服务器Socket通迅将信息实时的传递给客户端,提高系统的安全性.  相似文献   

6.
智能视频监控系统借助计算机图像处理、模式识别等技术,可以在无人值守情况下,实时检测监控场景下的运动目标,并对其跟踪和行为理解.这主要涉及动态目标识别和在此基础上动态目标运动矢量的计算问题,本文就这两个问题的实现方法进行了详细研究和论述.  相似文献   

7.
运动目标检测和跟踪技术是视频监控系统中的两大关键技术,本文以智能视频监控系统研究为基点,介绍了智能视频监控系统的兴起及组成部分、运动目标检测与跟踪算法的基本作用原理,阐述了基于智能视频监控系统的运动目标检测方法和运动目标检测方法的实现,分析了包括基于均值偏移的跟踪算法、基于粒子滤波的跟踪算法、融合Mean-Shift的粒子滤波跟踪算法在内的运动跟踪方法,对于后期智能视频监控系统的运动目标检测和跟踪研究具有一定的指导意义.  相似文献   

8.
在微弱信号检测中,以提高检测信号的信噪比来获取有用信号。重点介绍ADC在微弱信号检测中提高检测手段的2种技术—抖动技术与过采样和平均技术,并做简单总结。  相似文献   

9.
随着数字图像处理技术的不断发展,智能视频监控系统在安防中得到越来越广泛的应用。在无光源的条件下,普通的智能视频监控系统无法检测到黑暗中的目标,而基于红外的智能视频监控系统却克服了这一缺点。介绍了红外智能视频监控系统组成及工作原理,重点阐述了基于红外的智能视频分析技术,并给出了红外智能视频分析的实际案例。  相似文献   

10.
扩频通信技术与常规的通信技术相比,具有低截获率,强抗噪声,抗干扰性,具有信息隐蔽和多址通信等特点。直接序列扩频系统的同步包括伪随机码同步和载波同步,在伪随机码同步过程中,捕获是整个同步过程中最困难的.尤其是在低信噪比条件下的长码快速捕获。  相似文献   

11.
基于小波分析的红外弱小目标检测算法   总被引:1,自引:0,他引:1  
针对红外弱小目标检测需求,根据红外弱小目标图像特性及其小波分析特性,提出了一种基于小波分析的红外弱小目标检测算法。算法首先对红外弱小目标图像进行小波分解;然后置低频小波系数为零去除背景,阈值化高频小波系数滤除噪声,自适应子带增强加强目标能量;最后进行小波逆变换并进行自适应阈值分割。实验结果表明,提出的算法速度快、抑制噪声的能力强。  相似文献   

12.
在分析小目标与背景特性的基础上,根据云层边缘几何形状,构造出灰度形态学多结构元素。用多结构形态开运算对含有小目标的云杂波背景图像进行背景抑制,然后利用全局阈值分割方法将背景抑制后的图像转化为二值图像,提取图像中的小目标。仿真试验表明,该算法对两种云杂波背景均能有效抑制,提高图像的信噪比,减轻后续运算的复杂性。  相似文献   

13.
Pigeons searched for symbolic targets among heterogeneous distractor items displayed on a video monitor. Phase 1 varied target identity and overall display size, thus establishing differential discriminabilities of three target symbols. Phase 2 varied the relative probability of these targets within sessions. The findings showed that reaction time was lower not only when targets were more discriminable, but also when they were relatively frequent; these effects did not depend on the discriminability of the less frequent targets. Phase 3 was similar in design but provided occasional choice trials on which two targets appeared. The birds were more likely to respond to the more frequent target on such trials only if it was also the most discriminable. The data are not consistent with certain predictions from Guilford and Dawkins’ (1987) reinterpretation of effects attributed to search images. The data indicate that detection and choice are modified jointly by priming-induced expectancies and stimulus-driven perceptual processes.  相似文献   

14.
A framework of region-based dynamic image fusion   总被引:1,自引:0,他引:1  
INTRODUCTION Image fusion is a sub-area of more general topics of Information Fusion and Data Fusion and deals with static images and dynamic images (image sequences or video data) (Maitre and Bloch, 1997). By com-bining the information from a range of image data obtained by different sensors or the same sensor with different imaging schemes, the composite image al-ways presents the complementary information of different input images at the same time and provides us the integrated descr…  相似文献   

15.
Based on the high frequency (HF) integrated radar cross section (RCS) calculation approach, a technique of detecting major scattering source is developed by using an appropriate arithmetic for scattering distribution and scattering source detection. For the perfect adaptability to targets and the HF of the HF integrated RCS calculation platform, this technique is suitable to solve large complex targets and has lower requirement to the target modeling. A comparison with the result of 2-D radar imaging confirms the accuracy and reliability of this technique in recognition of the major scattering source on complex targets. This technique provides the foundation for rapid integrated evaluation of the scattering performance and 3-D scattering model reconstruction of large complex targets. Project supported by the National Natural Science Foundation of China (Grant No.90305026)  相似文献   

16.
Repeated exposure to a single target type (sequential priming) during visual search for multiple cryptic targets commonly improves performance on subsequent presentations of that target. It appears to be an attentional phenomenon, a component of the searching image effect. It has been argued, however, that if searching image is an attentional process, sequential priming should also interfere with performance on subsequent nonprimed targets, and such interference has never been unequivocally demonstrated. In blue jays (Cyanocitta cristata) searching in an operant apparatus for targets derived from images of cryptic moths, detection performance was strongly facilitated in the course of a sequential prime but was relatively unaffected by sequences of mixed target types. Detection accuracy in subsequent probe trials was enhanced by priming with targets of the same type, whereas accuracy on cryptic probes following priming with a more conspicuous target was significantly degraded. The results support an attentional interpretation of searching image.  相似文献   

17.
预放器是电视系统中决定图象质量最关键单元电路之一,于抓住低噪声电路设计之重点,本文通过等效电路分析与数学推导,方法。而在预放器所有特点中,要求低噪声居首位。为了有利得到预放器信杂比计算式,由此指出提高其信杂比的  相似文献   

18.
针对复杂水面环境下的船舶目标检测问题,运用融合图像显著性的YOLOv3船舶目标检测改进算法以提高检测能力。该算法基于Darknet-53网络模型,根据水上船舶特点,融合非极大值抑制算法Soft-NMS和显著性检测算法FT思想,进一步优化最终检测以达到更准确的效果。用Soft-NMS算法替换原有NMS算法,使得算法对小目标和重叠目标检测效果明显提升。融入FT算法对船舶图像局部细节作进一步细化,使得包围盒回归更加准确。在建立的数据集上进行训练与测试,实验结果表明,改进方法比原始方法准确率提高4%,达97%,检测速度提高10帧/s,达30帧/s,表明改进算法有效提高了船舶目标检测精度,且加快了检测速度。  相似文献   

19.
文章针对红外图像目标检测问题,提出一种基于分形的快速最大熵的红外图像特征检测算法.该算法利用DBC方法计算分维数,根据人造物和自然背景分形维差异,确定目标区域;最后,通过二维最大熵原则确定最佳阈值,实现对单目标或者多目标图像分割.该算法能够较好实现红外图像特征检测,有效抑制背景和噪声.  相似文献   

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