The wavelet coefficient of the feature band was regarded as the feature parameter of the acousto ultrasonic signal and it can distinguish defects from the adhesively bonded joints 以此特征频带的小波变换系数作为声-超声信号特征参数,可分辨出胶接区域的缺陷信号。
According to the difference of wavelet coefficients between information and noise transformed in different scale , they can be separated , and noise is got rid of 小波滤波就是利用信号和噪声在各尺度通下的小波变换系数有所不同的特点,来对它们进行分离,从而达到去噪的目的。
Thus an image fusion scheme based on the discrete wavelet transform will also be shift dependent , which is undesirable in practical image fusion process ( especially considering misregistration problems ) 当输入信号有轻微的移动时,所产生的小波变换系数会有很大的变化,这在图象融合领域是不希望发生的。
This approach that is based on the assumption that rubbing produces features in a monitoring signal which result in very large wavelet coefficients at a certain level can detect the presence and occurrence of damage 结构出现损伤时,在某一尺度时刻其小波变换系数将出现峰值,从而给出损伤指示,实现损伤时域的定位。
Abstract : taking affine transformation for example , the influenc e of distribution and number of orientation points on accuracy of transformation coefficients is discussed in detail in this paper , and the conclusions are help ful to practice 文摘:以仿射变换为例详细讨论了定向点的分布、数量对变换系数的精度影响,所得出的结论对实际工作具有指导意义。
Based on the theoty of statistical dctection and research on distribution of dct coefficiefits , the chapter 3 proposes a robust 3d motion blind watermark detection algorithin , which is a sign correlation detection scheme 第三章基于统计检测理论与dct变换系数分布的研究,提出一个鲁棒的三维运动盲水印检测算法,它是一个dct变换域上的符号相关性检测算法。
( 3 ) the conventional interpolated dft algorithms are analyzed . a new method , which estimates frequency with high precision and fast rate compared with the mentioned methods for the real single tone based on dft , is presented ( 3 )在分析常规的插值算法基础上,提出了一种单信号的快速插值频率估计方法,只需三个fft变换系数的实部构造频率修正项,计算量低。
This dissertation suggests scheme of image denoising based on two - dimensional discrete wavelet transform . the denoising algorithm is described with some operators . by thresholding the wavelet transform coefficients - of noisy images , the original image can be reconstructed correctly 通过对小波变换系数进行阈值处理,给出了一种基于二维离散小波变换的图像去噪方法并用算子的形式加以描述。
A method of face classification and recognition based on dct and svm is proposed . the features are extracted by dct and a small set of dct coefficients are inputted to svm . the experiments show that the performance is satisfactory 提出了一种基于dct和支持向量机的人脸分类和识别方法,首先对人脸图像作二维离散余弦变换,取离散余弦变换系数作为特征输入支持向量机,然后用支持向量机进行性别分类及人脸识别。
The unary code is applied in the binarization of the translation coefficients in the national standard avs . it is preponderant for the small values , but will bring more redundancy for the bigger ones . so the exp - golomb code is introduced for the redundancy reduction 在avs标准中,变换系数level值的二值化方案采用了unary码, unary码对较小的整数值二值化效果较好,但对较大的值则会造成很大的冗余,从而影响了cabac的编码效率。