Color imaging through scattering media based on phase retrieval with triple correlation

Abstract

Light passing through scattering media will be strongly scattered and diffused into a complex speckle pattern, which contains most of the spatial information and color information of the objects. Although various technologies have been proposed to realize color imaging through scattering media, current technologies are still inflexible, since they require long sequence measurement for each imaging pixel or spectral point spread functions of an optical system. In this paper, we propose a color imaging method through scattering media based on phase retrieval with triple correlation. Here, we theoretically prove that the spatial averaging of the triple correlation technique can be used to retrieve the Fourier phase of object and we experimentally demonstrate that it can be applied in color imaging through scattering media. Compared to other phase retrieval techniques, phase retrieval with the triple correlation technique can retain the orientation information of objects and can composite the color image without rotation operation. Furthermore, our approach has the potential of realizing spectral imaging through scattering media.

Depth-resolved imaging through dynamic scattering media via speckle cross-correlation under near-infrared illumination

“…[3], space remote sensing, and other domains. To address these issues, numerous approaches [4][5][6][7][8][9] have been presented, such as the optical gating method, the wavefront shaping method, and the speckle correlation method. Optical gating methods [10,11] enable direct imaging by collecting ballistic photons and blocking diffusive photons in the temporal or spatial domains.…”

Convenient noncooperative speckle-correlation imaging method

“…Therefore, to solve this problem, in the image acquisition process of pseudothermallight-illumination speckle-correlation imaging systems, an additional iris with a diameter of D 0 (D 0 is typically less than 1 cm, and much smaller than the diameter of the diffuser D) is placed between the diffuser and the detector to enlarge the mean radius of speckle grains and yields high-contrast speckles [7][8][9][10]12,14] . As for the LED-illumination system, a small enough aperture, lying between the LED and object, is used to limit the size of a light spot projected onto the diffuser, which acts as an iris to reduce the effective area of the diffuser [11,[15][16][17] . Basically, the above speckle-correlation imaging methods are both essentially cooperative because the position and size of the iris require it to be adjusted with the object's position and size to obtain a high-quality speckle autocorrelation.…”

Locating and Imaging through Scattering Medium in a Large Depth

“…Nowadays, the object recovery mainly focuses on imaging objects in the camera sensor and locating the depth of hidden objects. Some methods have been put forward to solve the scattering imaging problem, such as single-pixel imaging [ 4 , 5 ], time-gated holographic imaging [ 6 , 7 ], wavefront shaping imaging [ 8 , 9 , 10 ] and speckle correlation imaging [ 11 , 12 , 13 , 14 , 15 ]. However, the use of compressive sensing with single-pixel imaging is limited to scenes that are sparse on the chosen basis [ 4 ], the time-gated holographic imaging is mainly focusing on detecting ballistic and near-forward scattered photos [ 7 ], the state-of-the-art devices cannot shape the complex-valued wavefront precisely via wavefront shaping methods [ 16 ] and the speckle correlation methods have a strict limitation on the field of view [ 11 , 12 ].…”