新的方向滤波器组具有良好的方向和频率选择性。
The new DFB can provide good directional and frequency selectivity.
它是由非抽样塔形滤波器组和非抽样方向滤波器组组成。
It is composed of nonsubsampled Laplacian pyramid and nonsubsampled directional filter Banks.
人们相继提出了许多基于方向滤波器组的几何图像变换方法。
Recently, some geometrical image transforms based on the DFB have been introduced.
构造了由非抽样塔式分解和方向滤波器组实现的冗余轮廓波变换。
The redundant contourlet transform implemented by undecimated pyramidal decomposition and directional filter bank is proposed.
根据重磁场频谱的这一方向特性，可以设计出各种各样的方向滤波器。
Various directional filters can be designed according to the directional characteristic of the frequency spectra of gravitational and magnetic fields.
实验表明，在不同的分解级，金字塔复方向滤波器组的每个子带系数也都是符合GGD模型的。
The experiments show that the coefficients of PDTDFB transform is accorded with the GGD model at different decomposition level.
所做工作主要有两方面：一是矢量量化编码中的格型矢量量化，另一个是梅花型方向滤波器的提升实现。
The work can be mainly divided into two aspects: lattice vector quantization in vector quantization coding for images and the lifting realization of the quincunx directional filter banks.
在设计方向滤波器时，对滤波器的旋转引入了方—圆变换的方法，进而减少了计算的复杂度，同时避免引入误差。
While designing orientation filter, we introduced the square-circle transform to rotate filter, thus we reduced computing complexity and avoided imported errors.
重点研究图像的预处理增强算法和二值化算法，根据指纹图像的方向性信息求出方向图，并利用方向滤波器对原图像进行滤波去噪。
Enhancement and binarization algorithm are the emphases among them. According to fingerprint feature, orientation map is calculated, and image is denoised by orientation filters.
重点研究图像的预处理增强算法和二值化算法，根据指纹图像的方向性信息求出方向图，并利用方向滤波器对原图像进行滤波去噪。
Enhancement and binarization algorithm are the emphases among them. According to fingerprint feature, orientation map is calculated, and image is denoised by orientation filters.
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