基于分段非线性权重值的Pso算法，计算目标和海洋回波的功率谱密度,中介真值程度度量，基于中介真值程度度量的图像分。- Based on piecewise nonlinear weight value Pso algorithm, Calculating a target and ocean echo power spectral density, The true extent of the value of the intermediary measure, measure the true extent of the agency based on the value of image segmentatio.