摘要
提出了一种基于小波的频域体绘制算法(FWVR)进行三维图像重构。算法首先完成三维体数据的傅里叶变换和切平面提取,然后在频域中完成小波的多分辨率分解,并在不同分辨级上进行小波系数重建,最后做傅里叶逆变换,以得到观察平面上希望得到的体绘制图像。算法是基于CT成像和小波变换的原理,时间复杂度由视平面上的二维傅里叶逆变换决定,即O(N2logN)。应用此方法对128的医学体数据进行实验,结果证明该方法有效,采用伪彩色后的绘制效果3与光线投射法绘制效果基本相同,而速度大大提高。
A new Fourier -wavelet volume rendering algorithm(FWVR)in frequency domain is presented.After the wavelet transforming and slice plane obtaining,FWVR finish the volume rendering image by accomplishing the wavelet multi-resolution decomposition and reconstruction in different level and2D inverse Fourier transformation.For the algo rithm is based on the CT imaging and wavelet transformation,the time complexity of this method is O(N 2 log N)which is decided by the2D Fourier transformation.Experiment of medicine volume data shows that this method is efficient and the effect of the pseudo-color is the same as that of the ray casting method,but the complexity of the computation is reduced.FWVR is important for decomposition of image data and network transportation of remote distance.
出处
《计算机工程与应用》
CSCD
北大核心
2005年第6期50-53,共4页
Computer Engineering and Applications
基金
陕西省自然科学基金(编号:2002F03(10))
关键词
频域小波变换
三维图像
体绘制
Fourier-wavelet transformation,3D image,volume rendering
