Many scholars have made a lot of research on PIV technique, but there is still much faultiness in theories and applications. As the density distribution of the particles in images is so asymmetrical that it usually brings imprecise correlation results.

• 近年来国内外很多学者对PIV技术作了大量的研究工作，但在PIV技术的理论和应用研究方面都还存在不完善之处，其中的一个重要方面体现在由于图像中的粒子密度分布不均匀而导致的相关分析结果不精确。