摘要
为了给图像重建中插值方法的选择提供依据,研究了线性插值和样条插值对重建图像的质量影响。分析了常用的插值技术,从一维插值的角度,从理论和实验两个方面分析了线性插值和样条插值的性能,将两种方法应用到滤波反投影法图像重建中,分析了两种方法在不同的投影采样间隔的情况下对重建图像的质量影响。结果发现在一维信号插值时,样条插值精度高,但在图像重建时,采用更精确的样条插值反而使得重建图像的质量下降。最后指出图像重建时应该采用能更好的抑制振荡噪声的线性插值方法。
To provide choice basis for interpolation methods of image reconstruction,the quality influence of linear interpolation and spline interpolation to image reconstruction is studied.Usual interpolation technology is analyzed.Then the performances of linear interpolation and spline interpolation is analyzed from the angle of one dimensional interpolation and from two sides of theory and experiment.Finally the two methods is applied to image reconstruction based on filtered back projection algorithm and the two methods＇influence on the reconstructed image＇s quality is analyzed in the circumstances of different sample interval of projections.The result demonstrates that spline interpolation＇s accuracy is relative high for one dimensional interpolation,but comparatively accurate spline interpolation can decrease the reconstructed image＇s quality for image reconstruction.It is pointed finally that linear interpolation method should be adopted in image reconstruction for it can reduced surge noise.
出处
《计算机工程与设计》
CSCD
北大核心
2009年第9期2213-2216,共4页
Computer Engineering and Design
基金
国家自然科学基金重点项目(60532080)
关键词
图像重建
滤波反投影
线性插值
样条插值
误差
image reconstruction
filtered back projection
linear interpolation
spline interpolation
error
