神经多光谱辐射高温计的研制

研制成功一种新型的与发射率无关的多光谱辐射高温计。采用神经网络技术、棱镜分光技术，克服了以往需要假设发射率与波长函数关系以及光导纤维分光、干涉滤光片限定工作波长的缺点，可用于自动识别大多数工程材料的真温及光谱发射率。     

Contextual classification of multispectral image data

Compound decision theory is invoked to develop a method for classifying image data using spatial context. Methods for characterizing contextual information in an image are proposed and tested. Experimental results based on both simulated and real multispectral remote sensing data demonstrate the effectiveness of the contextual classifier. A number of practical problems associated with this approach are discussed and possible solutions are explored.     

基于高分遥感影像匹配的露天矿滑坡形变场监测方法

针对利用SIFT(Scale-invariant feature transform)算法提取全色遥感影像特征点时存在数量少、分布不均、影响滑坡形变场监测效果等问题,提出了一种综合利用SIFT与CSIFT(Colored scale invariant feature transform)算法进行滑坡形变场标定的方法。该方法利用SIFT算法分别处理全色影像和多光谱融合影像,利用CSIFT算法处理多光谱融合影像,将3个过程提取的互不相同的特征点进行叠加,得到更多的特征点。以抚顺西露天煤矿南帮滑坡为例进行试验,结果表明:新方法能够充分利用3种不同影像匹配过程的特点,大大增加了特征点数量,使得生成的滑坡形变场更加精确,所圈定的滑坡范围更加准确,且该方法具有成本低、效率高等优点,非常适合于大型滑坡的大变形形变场监测。     

传世艺术画作的多光谱图像数字典藏技术

介绍了多光谱颜色技术和以及国外研究近况,提出了运用多光谱颜色技术获取多光谱图像对传世艺术画作进行抢救性保护的可操作技术途径.构建了宽带多光谱成像实验系统,实验表明7个宽带通道的多光谱图像获取系统,光谱重建精度满足颜色重现精度的要求:无论最大色差和平均色差都小于人眼可分辨容限,可以满足艺术画作图像颜色高保真重现的目的.     

Retrieval of oceanic chlorophyll concentration with relevance vector machines

In this communication, we evaluate the performance of the relevance vector machine (RVM) for the estimation of biophysical parameters from remote sensing data. For illustration purposes, we focus on the estimation of chlorophyll-a concentrations from remote sensing reflectance just above the ocean surface. A variety of bio-optical algorithms have been developed to relate measurements of ocean radiance to in situ concentrations of phytoplankton pigments, and ultimately most of these algorithms demonstrate the potential of quantifying chlorophyll-a concentrations accurately from multispectral satellite ocean color data. Both satellite-derived data and in situ measurements are subject to high levels of uncertainty. In this context, robust and stable non-linear regression methods that provide inverse models are desirable.Lately, the use of the support vector regression (SVR) has produced good results in inversion problems, improving state-of-the-art neural networks. However, the SVR has some deficiencies, which could be theoretically alleviated by the RVM. In this paper, performance of the RVM is evaluated in terms of accuracy and bias of the estimations, sparseness of the solutions, robustness to low number of training samples, and computational burden. In addition, some theoretical issues are discussed, such as the sensitivity to training parameters setting, kernel selection, and confidence intervals on the predictions.Results suggest that RVMs offer an excellent trade-off between accuracy and sparsity of the solution, and become less sensitive to the selection of the free parameters. A novel formulation of the RVM that incorporates prior knowledge of the problem is presented and successfully tested, providing better results than standard RVM formulations, SVRs, neural networks, and classical bio-optical models for SeaWIFS, such as Morel, CalCOFI and OC2/OC4 models.     

基于OMAP3530的嵌入式多光谱掌纹识别系统

基于OMAP3530双核平台实现一个嵌入式多光谱掌纹识别系统。采用Palm Code掌纹识别算法,通过融合掌纹与手掌静脉提高系统防伪性,同时使算法的准确率从可见光的91.33%提高到95.33%。在OMAP3530实现时,让具有强大运算能力的DSP处理器专注于复杂的特征提取运算,ARM处理器则负责图像采集、外设控制、任务调度及用户交互。所设计的系统集成图像采集模块和中心处理主板,识别率高、防伪性强并且具备实时处理性能。     

基于无人机遥感技术的森林参数获取研究进展

凭借着高分辨率、可控性强和性价比高的特点,无人机遥感技术在森林研究中得到了迅速的发展与应用.对无人机遥感成像平台的发展和国内外利用无人机遥感技术开展森林调查的情况进行介绍,针对单木和林分两种森林资源调查对象,总结了目前利用无人机遥感技术提取森林参数的前沿方法.重点分析和讨论了基于无人机平台的多光谱、高光谱和激光雷达传感...     

基于整数小波变换的机载多光谱图像无损压缩

首先探讨了基于提升方案的整数小波变换,结合线性预测技术,提出了一种机载多光谱遥感图像的无损压缩方法。该方法通过整数小波变换减少图像的空间冗余,然后根据多光谱图像谱间的相关性对整数小波变换后的结果进行预测,并且加进了相关性判断这一环节保证了预测的有效性。算法适合并行处理和硬件实现。对机载64波段多光谱遥感图像的试验结果表明,该方法与改进的预测树方法相比其无损压缩比平均提高了16%,压缩时间缩短了三分之二。     

A comparison of selected pattern recognition functions

In this study computer simulation is used to compare selected pattern recognition functions. The Highleyman deck of 50 hand written characters provides one comparative data base. A second data base is derived from multispectral infrared sensor data taken over California's Imperial Valley. Emphasis is placed on comparing the classical minimum distance recognition functions with two new recognition functions introduced in a recent predecessor article.     

A feature reduction and unsupervised classification algorithm for multispectral data

A new scheme, incorporating dimensionality reduction and clustering, suitable for classification of a large volume of remotely sensed data using a small amount of memory is proposed. The scheme involves transforming the data from multidimensional n-space to a 3-dimensional primary color space of blue, green and red coordinates. The dimensionality reduction is followed by data reduction, which involves assigning 3-dimensional samples to a 2-dimensional array. Finally, a multi-stage ISODATA technique incorporating a novel seedpoint picking method is used to obtain the desired number of clusters.

The storage requirements are reduced to a low value by making five passes through the data and storing necessary information during each pass. The first three passes are used to find the minimum and maximum values of some of the variables. The data reduction is done and a classification table is formed during the fourth pass. The classification map is obtained during the fifth pass. The computer memory required is about 2K machine words.

The efficacy of the algorithm is justified by simulation studies using multispectral LANDSAT data.