基于成像测井资料多种滤波方法在裂缝识别中的应用

基于电导率成像测井资料,以选取合适的滤波方法增强裂缝信息、提高裂缝识别精度为目的,利用均值滤波、中值滤波及小波变换滤波方法对川西邛西A井的电导率数据进行滤波处理。通过对比分析各种滤波方法的滤波质量评价指标选取最佳滤波窗口及滤波方法,利用surfer软件对滤波的电导率数据进行再次成图识别裂缝。将滤波的电导率成像图与FMI测井成像图对比分析。研究结果表明,各种滤波方法均能在一定程度上增强裂缝信息,在裂缝滤波识别过程中,小波变换滤波效果要优于均值滤波及中值滤波的滤波效果。小波变换电导率成像图识别裂缝的准确度较高,为成像测井的人机交互解释提供依据,可有效提高裂缝识别精度。     

基于FPGA的实时视频采集预处理系统设计

采用Verilog语言设计了一套基于RGB格式的视频采集预处理系统,先将采集到的RGB信号转换成易于处理的YCbCr信号,然后进行相应的处理,最后再转为RGB信号输出显示.系统包含视频采集模块、视频显示模块、ⅡC控制模块和视频处理模块.各个模块的功能通过在Xilinx公司的XC5VLX110T上得到实现.给出了系统的效果演示、仿真结果和效率分析,结果表明该方案是可行的,并且在处理速度上有很大的优势.     

Implementation of Real‐Time Post‐Processing for High‐Quality Stereo Vision

We propose a novel post‐processing algorithm and its very‐large‐scale integration architecture that simultaneously uses the passive and active stereo vision information to improve the reliability of the three‐dimensional disparity in a hybrid stereo vision system. The proposed architecture consists of four steps — left‐right consistency checking, semi‐2D hole filling, a tiny adaptive variance checking, and a 2D weighted median filter. The experimental results show that the error rate of the proposed algorithm (5.77%) is less than that of a raw disparity (10.12%) for a real‐world camera image having a resolution and maximum disparity of 256. Moreover, for the famous Middlebury stereo image sets, the proposed algorithm's error rate (8.30%) is also less than that of the raw disparity (13.7%). The proposed architecture is implemented on a single commercial field‐programmable gate array using only 13.01% of slice resources, which achieves a rate of 60 fps for stereo images with a disparity range of 256.     

基于加窗平滑的融合算法在单兵雷达中的应用

单兵雷达有着简便易携带,隐蔽性好等优点,但单兵雷达使用时受环境影响较大,周围建筑物遮蔽物限制了雷达的探测范围,也会产生大幅度的干扰,从而给多个雷达目标间的数据融合带来问题。针对这一问题,使用中值加窗的方法可以消去由单个雷达带来的大幅干扰。描述了一种应用于单兵雷达的基于加窗平滑处理的中值融合算法的理论模型和算法实现,在MATLAB环境下对该融合算法进行了仿真,并从中可以看出该融合算法在取得不错的性能表现,能够提升多个单兵雷达间的数据融合能力,降低了单个雷达的巨大误差对融合目标的影响。     

Identification and replacement of defective pixel based on Matlab for IR sensor

Infrared focal plane arrays (IRFPAs) usually contain many defective pixels.These defective pixels have to be corrected because those can significantly impair the performance of infrared image of IRFPAs...     

Genetic algorithm with competitive image labelling and least square

A multi-modal genetic algorithm using a dynamic population concept is introduced. Each image point is assigned a label and for a chromosome to survive, it must have at least one image point with its label. In this way, the genetic algorithm dynamically segments the scene into one or more objects and the background noise. A Repeated Least Square technique is applied to enhance the convergence performance. The integrated algorithm is tested using a 6 degrees of freedom template matching problem, and it is applied to some images that are challenging for genetic algorithm applications.     

各向异性扩散-中值滤波在红外图像处理中的应用

在低信噪比图像处理中．为了在图像去噪时更好地保留边缘。提出了一种各向异性扩散一中值滤波方法。这种方法包含两个步骤：首先。为了使滤波器在抑制噪声时具有鲁棒的边缘保持能力。该方法采用各向异性扩散滤波对图像进行处理。其中．各向异性扩散滤波中的扩散函数选用Tukey函数；然后。为了去除各向异性扩散滤波后图像中的脉冲噪声．采用中值滤波对图像做进一步的处理。从而使这种滤波方法在抑制噪声的同时使边缘模糊达到最小。从仿真结果可以看出，文中的方法具有良好的噪声抑制和边缘保持能力。     

Exploring anchoring effect and the moderating role of repeated anchor in electronic commerce

Most of the anchoring studies conduct the experiments following two-stage experimental design in which a comparative judgement is followed by an absolute estimate. However, this design is impractical in many situations, especially in online auction environments where consumers cannot be asked to make comparisons before they make estimates. This study suggests and validates an alternative experimental design where no comparison process is needed to induce anchoring bias. Moreover, we postulate that repeated occurrence of anchoring points affect the strength of the anchoring effect on participants' price estimates. Two experiments were conducted to investigate the anchoring effect in both two-stage and one-stage designs. The results showed that the anchoring effect was robust under two-stage design, and repeated occurrence of the anchor did not reinforce the anchoring effect. Moreover, people's price estimates are susceptible to the anchoring effect even when they were not asked to make a comparative judgement before they determine the final estimate. However, the anchoring effect can be further consolidated when the anchor appears three times rather than once. Experimental design introduced in study 2 provides a promising website design direction and we suggest that high anchors should be embedded in a web page repeatedly to influence the buyers' value estimates to produce a premium.     

小波波阻抗反演技术的改进及应用

针对松阵盆地中部组合油层在空间上分布薄且横向变化快的特点，以提高复杂地质条件下的储层横向预测精度、提高探井成功率为目的，对小波波阻抗反演技术在应用中存在的问题进行了改进，一是针对大倾角地震资料信噪比低的问题了倾角扫描技术；二是针对波阻抗剖中常出现锯齿状波形而引入中值滤波技术，结果表明，改进后的小波波阻抗反演技术，能够改善大倾角地层地震资料的反演效果，可以进一步提高油藏描述精度，效果较好。