关键词: 多椭圆形目标, 主元素分析, 加权的EM, 统计模型

Abstract: A multiple elliptic target detection algorithm based on EM algorithm is proposed in this paper.Because elliptic target coincides with Gaussian distribution on shape，its mean and variance matrix can be calculated by employing statistical method.So the principle component analysis is used to describe their size，position and main axis.For an overlapped multi-target region，a weighted EM iterative algorithm is constructed to calculate the number of targets in it，the statistical and geometric properties of every ellipse.This algorithm is employed to fruits and moving target detection.The result is stable and accurate.

Key words: multi-elliptic target, principle component analysis, weighted EM, statistical model