X射线法ICF靶丸几何参数批处理及壁厚分布计算

分析了靶丸微焦X射线成像的基本原理,采用改进Hough变换对靶丸X射线数字图像进行自动圆参数检测,结合最小二乘圆拟合算法获得了精确的多层靶丸几何参数,给出了靶丸图像批处理的整个分析流程,并开发了一套完整的靶丸X射线图像批处理计算软件。在此基础上讨论了靶丸壁厚分布的批处理计算问题,给出了多层靶丸壁厚分布状态及单层靶丸全表面壁厚分布情况的计算示例。

基于DSP的X射线图像实时显示系统设计

研究一种基于高速处理芯片TMS320DM643的X射线图像实时处理及显示系统,针对X射线图像的特点,分析系统整体性能,包括接口电路,A/D、D/A转换芯片、EDMA、二级缓存等。对应用的DSF等主要芯片进行了合理配置,分析运用图像处理算法,选择出适合的算法,编写算法流程图,达到了预期的显示效果。

YLX-G3563型工程机械轮胎X射线检验机

介绍YLX-G3563型工程机械轮胎X射线检验机的工艺流程、主要技术参数、机械结构、控制系统和X射线与图像系统。该机采用X射线发生装置通过轮胎定位及旋转装置分3次定位对轮胎胎侧和胎面部位进行检测,检测图像由896像素的探测器接收传至数据采集系统,并对轮胎进行判级。该检验机能很好地检测出轮胎内部钢丝帘线排列不均、带束层钢丝帘布级差、气孔、裂缝、裂纹和杂质等质量缺陷。

Study on Limited Projections in Micro—focus X—ray Swing Laminography

This paper resents a new X-ray imaging method swing Laminography(SL) that is suitalble to perform non-destructive testing on the slender-shaped multi-layer samples.Computer simulations are made to compare the limited projections in SL and the principle of choosing Optimal Projection Angular Region(OPAR) is discussed.The experiment on a two-layer Printed Circuits Board shows that SL with 120° swing angles distributed in OPAR can get the separated images of each layer.

基于X射线图像的苹果体积在线快速测算

利用X射线二维图像的每个灰度值的负指数与厚度成正比的关系,在实验参量设置一定的条件下,计算出苹果的衰减系数;建立苹果体积数学预测模型,计算出苹果的体积。实验结果表明,X射线能量衰减与苹果厚度符合指数规律,回归相关系数R2μ=0.9932,衰减系数μ-m=0.0114;完整苹果真实体积与计算体积相关系数R2ν=0.9809,预测相关系数r2=0.9203,因此模型具有良好稳健性和预测性。

Development of Automatic Extraction Weld for Industrial Radiographic Negative Inspection

In industrial X-ray inspection, in order to identify weld defects automatically, raise the identification ratio, and avoid processing of complex background, it is an important step for sequent processing to extract weld from the image. According to the characteristics of weld radiograph image, median filter is adopted to reduce the noise with high frequency, then relative gray-scale of image is chosen as fuzzy characteristic, and image gray-scale fuzzy matrix is constructed and suitable membership function is selected to describe edge characteristic. A fuzzy algorithm is adopted for enhancing radiograph image processing. Based on the intensity distribution characteristic in weld, methodology of weld extraction is then designed. This paper describes the methodology of all the weld extraction, including reducing noise, fuzzy enhancement and weld extraction process. To prove its effectiveness, this methodology was tested with 64 weld negative images available for this study. The experimental results show that this methodology is very effective for extracting linear weld.

违禁品X射线图像反锐化双掩模图像增强方法研究

针对在使用X射线成像仪检测违禁品过程中,检测信号的转换和传输易导致违禁品图像对比度低、边缘模糊等问题,提出一种图像预处理和反锐化双掩模增强算法来提高违禁品图像效果。图像预处理用于去除图像成像过程中产生的噪声和边角阴影问题,试验结果表明,提出的图像预处理算法对图像的边角问题和夹杂噪声的去除效果明显。进一步提出了一种反锐化双掩模图像增强方法,对图像中不同尺度图像细节信息进行叠加增强。试验结果表明,该增强算法对违禁品图像对比度和边缘细节的增强效果明显,可有效提高违禁品的检测精确度和效率。通过改变管电压大小改变图像的亮度,验证了图像预处理和图像增强方法均有较好的鲁棒性。