Multimode Fiber Transmission Matrix Imaging Based on Hadamard Modulation
Multimode fiber has strong image transmission capabilities due to the characteristics of scattering media,and has important application value in special fields such as medical endoscope and complex industrial detection.Since the mode dispersion and mode coupling of multimode fiber lead to random distortion in the transmitted images,it is necessary to interpret the distorted images to improve the image quality.In multimode fiber imaging technology,the transmission matrix method has become the mainstream because of its advantages such as simple system and fast imaging speed.However,the existing transmission matrix measurement technology suffer from heavy computing load and insufficient light utilization.In this paper,Hadamard modulation,which is rich in orthogonal modes and has high utilization rate of mask modulation light power,is combined with transmission matrix measurement.The Structural Similarity Index Measure(SSIM)is used as the evaluation index of image reconstruction to reconstruct the distorted image.The results show that under the same sampling number,the SSIM of Hadamard modulation reconstruction image is 2.47 times that of conventional modulation reconstruction image,the highest is 0.98,the reconstruction time is reduced by 20%,and the light utilization is 10 times higher than that of unit matrix modulation.It is evident that based on Hadamard modulation technology,the image quality and system performance of multi-mode fiber imaging can be effectively improved,providing important technical support for the application of fiber optic imaging technology.
万方数据
维普
