CAJ | 학술논문

THz共焦扫描成像中，由于太赫兹激光器不可能恒定输出和采集信号微弱等原因，导致成像质量有待提高；数字图像复原方法是一种节约系统成本和空间的有效手段。文中提出了一种用于太赫兹共焦扫描图像复原的基于两步背景抑制、中值非局部均值(MNLM)滤波和灰度变换的复合方法，并将此方法用于真实太赫兹图像，与中值滤波、开运算和非局部均值滤波相比较。真实图像处理结果表明，此方法具有较好的复原效果，尤其是图像对比度有明显提高。
THz공초소묘성상중，유우태혁자격광기불가능항정수출화채집신호미약등원인，도치성상질량유대제고；수자도상복원방법시일충절약계통성본화공간적유효수단。문중제출료일충용우태혁자공초소묘도상복원적기우량보배경억제、중치비국부균치(MNLM)려파화회도변환적복합방법，병장차방법용우진실태혁자도상，여중치려파、개운산화비국부균치려파상비교。진실도상처리결과표명，차방법구유교호적복원효과，우기시도상대비도유명현제고。
Among the experiments of terahertz confocal scanning imaging, the image quality of the system remains to be improved for the reason that the terahertz laser used in the system can not constantly output and the signal acquisited by the detector is weak, etc. Digital image restoration is an effective method to save the cost and the space of confocal scanning imaging system. Based on the consideration above, a composite method was put forward for the use of the terahertz confocal scanning image restoration. This composite method is based on two-step background suppression, median non-local means (MNLM) filtering and gray level transformation. A comparison with median filtering, open operation and non-local means filtering was made after using this composite method on the real terahertz images. The results of real terahertz imaging processing show that this composite method has a good effect of image restoration and the image contrast is obviously enhanced in particular.