机构地区: 广东工业大学信息工程学院
出 处: 《计算机测量与控制》 2005年第5期468-469,476,共3页
摘 要: 高分辨率的空间敏感阵列以及实时、精确的图象重建算法是层析成象技术的关键。为了得到足够的投影数据, 提出了几种用于光学层析成像的多方向平行射束投影结构, 这几种结构均采用CCD器件作为敏感阵列, 可得到高分辨率的被测物场投影信息。同时分析了这几种投影结构下图象重建中权重系数的计算方法, 并对不同结构的图象重建效果进行了比较, 得出了投影方向数、投影数据与重建图象质量之间的关系。仿真结果表明, 采用CCD 的平行射束投影系统可重建出很高质量的图象。 Spatial sensitive array with a high resolving rate and fast reconstruction algorithm with an acceptable accuracy are keys to tomography. In order to obtain adequate projection data, several multi-direction parallel projection structures used in optical tomography are presented. These structures use CCD(Charge Coupled Device) as sensitive array and the high resolving rate projection information of measured material field can be obtained. Simultaneously, the method to calculate weight coefficient in image reconstruction under these projection structures is analyzed. Moreover, the image reconstruction effects of different structures are compared. The relationship among the number of projection direction, the number of projection data and the image quality is educed. The result of the simulation indicates that the Parallel Beams Projection system with CCD can reconstruct high quality image.
关 键 词: 投影系统 多方向 图像重建 射束 平行 光学层析成像 高分辨率 投影数据 图象重建 器件 成象技术 重建算法 计算方法 权重系数 同时分析 图象质量 仿真结果 结构 方向数 阵列 敏感