detcoef2对从两个高

代码说明：

detcoef2 提取二微小波分解高频系数 appcoef2 提取二维小波分解低频系数 wthresh 进行软阈值或硬阈值处理 wthcoef2 二维信号的小波系数阈值处理 ddencmp 获取在消噪或压缩过程中的默认值阈值-detcoef2 from two high-frequency micro-wave decomposition coefficient appcoef2 extract 2D wavelet decomposition low-frequency coefficients wthresh threshold for soft or hard threshold 2D signal processing wthcoef2 the wavelet coefficients threshold processing ddencmp access to the denoising or compression of default threshold