太赫兹图像的降噪和增强

太赫兹波由于其独特的性质而被用于对特定物体的无损检测和成像。提高成像质量成为影响太赫兹成像系统应用的关键。数字图像处理技术是改善图像质量的一条重要途径。基于太赫兹透射成像实验，研究讨论了运用空域滤波、高斯平滑、频域滤波和边缘检测等图像降噪和图像增强技术，有效克服成像系统的实验噪声、激光功率抖动等影响，并对图像降噪和增强方法的选择和处理效果做出了对比分析。结果显示，通过对图像降噪和图像增强技术的综合运用，可以大大提高太赫兹图像的清晰度和可辨识性。

De-noising and enhancement for terahertz imaging

Terahertz waves can be used as a tool of non-destruction detection and imaging for certain kinds of materials because of unique characteristics. Improvement of imaging quality is of great significance to the application of terahertz imaging system. Digital image processing is a very important solution to the enhancement of imaging quality. Based on terahertz transmission imaging experiments, investigation was made on the use of image de-noising and enhancement techniques in order to suppress the influence of experimental noise of the imaging system and ultra-short laser power jitter. The methods included spatial domain filtering, Gaussian smoothing, frequency-domain filtering and edge detection. Analysis on the choice of methods and the comparison of effects was also given. Results show that, through an integrated use of image de-noising and enhancement techniques, the definition and identifiability of terahertz images are improved enormously.