Non-invasive color imaging through scattering medium under broadband illumination

Abstract

Due to the complex of mixed spectral point spread function within memory effect range, it is unreliable and slow to use speckle correlation technology for non-invasive imaging through scattering medium under broadband illumination. The contrast of the speckles will drastically drop as the light source’s spectrum width increases. Here, we propose a method for retrieving the optical transfer function with several speckle frames within memory effect range to image under broadband illumination. The method can be applied to image amplitude and colored objects under white LED illumination. The method based on the mulit-frame speckles provide more reliable results with faster convergence speed than single-shot imaging.