An EM algorithm for dynamic SPECT

An EM-algorithm for dynamic SPECT tomography

An EM-algorithm for dynamic SPEC tomography

The EM Algorithm for Layered Dynamic Textures

A layered dynamic texture is an extension of the dynamic texture [1] that can model multiple regions (layers) of different motion. The motion in each layer is abstracted using a time-evolving state process, and each pixel formed from one of the state processes, which is assigned through a layer assignment variable. In Section 2 and Section 3, we derive the EM algorithm for learning the layered ...

An Improved EM algorithm

In this paper, we firstly give a brief introduction of expectation maximization (EM) algorithm, and then discuss the initial value sensitivity of expectation maximization algorithm. Subsequently, we give a short proof of EM's convergence. Then, we implement experiments with the expectation maximization algorithm (We implement all the experiments on Gaussion mixture model (GMM) ). Our experiment...

Em Filter for Time-varying Spect Reconstruction

The new filtering algorithm EM (expectation maximization) filter is introduced and is validated numerically by applying it to solve the ill-posed inverse problem of reconstructing a time-varying medical image. A linear statespace stochastic approach based on a Markov process is utilized to model the problem, while no precise a-priori information about the underlying dynamics of the physical pro...