传统DPIV算法主要于基区域相关运算，此法由于概念简单，操作方便而被广泛接受，但是存在速度慢，错配点多等众所周知的缺点。此文根据DPIV的成像特点以及所研究对象的物理性质，提出了流场的无源仿射模型，结合修改得到的整体不流模型，形成了一种计算DPIV的新方法。

Traditional DPIV (Digital Particle velocimetry) methods mostly are based on area correlation. Though proven to be very time consuming and much error prone, they are widely adopted because of their conceptual simple and easy to be implemented, and also because there is few alternative. This paper provides a non correlation, conceptual new, fast and efficient approach for DPIV which takes the nature of flow into consideration. An Incompressible Affine Flow Model(IAFM) is introduced to describe a flow that incorporates rational constraint directly into the computation. This IAFM, combining with a modified optical flow method named Total Optical Flow Computation(TOFC), provides a linear system solution to DPIV. Experimental results on real images demonstrate our method to be a very promising approach for DPIV.