Wavelet-domain HMT models the dependencies of multiscale wavelet coefficients through the state probabilities of the wavelet coefficients,whose distribution densities can be approximated by the Gaussian mixture model.

• 小波域隐马尔可夫树(HMT)模型采用混合高斯模型刻画各子带系数的概率分布；并通过小波系数隐状态在多个尺度之间的Markov依赖性来刻画自然图像小波系数随尺度呈指数衰减的特性.