Digital speckle pattern interferometry (DSPI) has a wide variety of useful applications but suffers from speckle noise that cannot be easily removed using conventional filtering. We study a method by which the contrast of speckle interference fringes may be enhanced, thus improving the measurement quality of DSPI. The results demonstrate both improved the fringe contrast and an improvement in the quality of the speckle fringes by reduction of the speckle noise is. When combined with a phase-stepping algorithm, the quality of the DSPI measurement is significantly improved. Finally, the measurement results of deformation using contrast enhancement also show improvement when compared with conventional filtering.

数字散斑干涉法（DSPI）具有多种有用的应用程序，但存在散斑噪声，使用常规滤波无法轻松消除。我们研究了一种可以增强斑点干扰条纹对比度的方法，从而提高了DSPI的测量质量。结果表明，通过减少斑点噪声，既改善了条纹对比度，又改善了斑点条纹的质量。当与相位步进算法结合使用时，DSPI测量的质量将大大提高。最后，与常规滤波相比，使用对比度增强的变形测量​​结果也显示出改善。