为了完全消除CCD背景噪声和杂散背景光对数字全息再现像质量的影响, 在全息图强度分别减去参考光波和物光波强度相减法和全息图强度分别减去参考光波和物光波强度及CCD背景噪声相减法的基础上, 提出了改善数字全息再现像质量的背景强度补偿法。介绍了背景强度补偿法的原理, 并实验对比了全息图的直接再现像及应用背景强度补偿法对不同背景强度下获得的全息图处理后的再现像。结果表明, 背景强度补偿法显著地改善了再现像质量, 降低了对数字全息图记录环境的要求。

Aiming at completely eliminating the influence of CCD’s noise and scattered background light on the reconstructed image of digital hologram, based on the hologram subtracting reference light intensity and object light intensity(HRO) subtraction method and hologram subtracting reference light intensity, object light intensity and CCD’s noise(HRON) subtraction method, the background intensity compensation method(BICM) was proposed. The quality of the experimentally reconstructed images of the original hologram and holograms processed by BICM was compared. Results show that BICM could effectively improve the quality of reconstructed image and relax the requirement on digital hologram recording environment.