离散余弦变换，尤其是它的第二种类型，经常被信号处理和图像处理使用，用于对信号和图像(包括静止图像和运动图像)进行有损数据压缩。有测试图片和源代码-Discrete cosine transform, in particular its second type are often used for signal processing and image processing for the signal images (including still images and moving image

实现连续小波变换，对信号进行频谱分析。精度很高-continuous wavelet transform

快速傅里叶变换函数，对一维信号信息和二维图像信息进行快速傅里叶变换-Fast Fourier transform function, one-dimensional and two-dimensional image information signal information fast Fourier transform