基于反投影坐标快速算法的木材CT检测系统研究

发布时间：2017-12-28 17:17

本文关键词：基于反投影坐标快速算法的木材CT检测系统研究　出处：《农业机械学报》2016年03期 　论文类型：期刊论文

【摘要】：针对木材内部结构复杂、不同树种间密度差异大的特点,提出了一种反投影坐标快速算法,基于此算法构建一套木材无损检测CT成像系统。该系统由X射线发射器、等距平板检测器、旋转载物平台和计算机数据采集成像软件构成。以集成材和小径级原木为试验对象,验证反投影坐标快速算法的可行性。首先采集并修正投影数据;其次根据射线源到旋转中心的距离计算出投影坐标值;最后设置滤波函数并与投影数据作卷积运算,重建木材断层图像。结果表明:应用反投影坐标快速算法,使CT系统图像重建工作平均用时缩短至1 s以内,断层图像分辨率达0.052 mm~2,可显示木材内部裂纹、孔洞等缺陷及节子、年轮、早晚材变化等构造特征,验证了该算法应用于木材无损检测成像系统的有效性。
[Abstract]:Aiming at the complex internal structure and large density difference among different tree species, a fast algorithm for back projection coordinate is put forward. Based on this algorithm, a set of CT imaging system for wood nondestructive testing is constructed. The system is composed of X ray emitter, isometric flat plate detector, rotating carrier platform and computer data acquisition and imaging software. The feasibility of the fast algorithm of backprojection coordinates is verified by using the lumber and the small diameter log as the test object. First, we collect and correct projection data; secondly, we calculate the projection coordinate value based on the distance from the ray source to the rotation center; finally, we set up the filter function and convolution operation with the projection data to reconstruct the wood fault image. The results show that the application of reverse projection algorithm, the image reconstruction of CT system the average time is shortened to less than 1 s, image resolution of 0.052 mm~2, can show the internal defects such as holes and cracks, wood knots, ring, earlywood and latewood change structural features, to verify the effectiveness of the detection algorithm in imaging system wood nondestructive.
【作者单位】：中国林业科学研究院木材工业研究所;山东建筑大学信息与电气工程学院;河北农业大学林学院;
【基金】：国家林业公益性行业科研专项(201304515)
【分类号】：S781;TP391.41
【正文快照】： 引言CT技术作为医疗影像诊断中不可缺少的检查手段,已逐步推广到工业、农业、林业等领域[1-6]。目前,工业X射线计算机断层扫描(X-ray computedtomography,CT)空间分辨率已达到10μm[7],分辨率较高,结合图像处理和分析技术可实现对高危油、汽管道材料内部的观测。林业科学研究

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