Single-shot broadband scattering imaging based on speckle frequency refinement

The speckle correlation technique (SCT), a noninvasive scattering imaging technique, has attracted widespread attention but is limited by the requirement of narrowband illumination.To address this drawback, we propose a broadband scattering imaging method based on speckle frequency refinement, which can effectively extract the useful components of speckle under broadband illumination.We verified its effectiveness through experiments with 10-400 nm bandwidth illumination.Notably, even under 400 nm bandwidth illumination, comparable to white light, the structural similarity index measure (SSIM) of the reconstruction by our method can stay above 0.6.This method can reconstruct the object using single-shot broadband speckles, demonstrating its potential advantages in practical applications.