物光与参考光强度比对数字全息再现像质的影响

为了提高数字全息显微中的重建精度及速率,采用理论分析与实验验证相结合的方法,对数字全息显微中基于同态信号处理的广义线性重建算法进行了理论分析,比较了同一物场在不同物光与参考光强比条件下的实验结果。结果表明,随着参考光与物光光强比的不断增大,广义线性重建算法再现像质得到明显改善,但当这一比值增大到一定值时,再现像质量则逐渐下降。寻找合适的物光、参考光光强比,是利用数字全息广义线性重建算法实现高质量再现像的重要条件。

Effect of reference intensity ratio to object on reconstructed image quality in digital holography

In order to improve the accuracy and speed of image reconstruction, the generalized linear reconstructing algorithm based on homomorphic signal processing was analyzed by combining theoretical analysis and experimental verification in the digital holographic microscopy. The experimental results of the same field under different reference intensity ratio to object were compared. The results show that: with the increase of the intensity ratio, the reconstruction image quality of the generalized linear reconstructed algorithm is improved obviously. However, the reconstructed image quality decreases when the ratio increases to a certain value. Finding an appropriate ratio is important for obtaining high quality reconstructed images for the generalized linear reconstruction algorithm in digital holography.