Spatial bandwidth extended reconstruction for digital color Fresnel holograms.
This paper presents a reconstruction algorithm based on the convolution formula of diffraction which uses the Fresnel impulse response of free space propagation. The bandwidth of the reconstructing convolution kernel is extended to the one of the object in order to allow the direct reconstruction of objects with size quite larger than the recording area. The spatial bandwidth extension is made possible by the use of a numerical spherical wave as a virtual reconstructing wave, thus modifying the virtual reconstruction distance and increasing the kernel bandwidth. Experimental results confirm the suitability of the proposed method in the case of the simultaneous recording of two-color digital holograms by using a spatial color multiplexing scheme.
Picart
Pascal
P
LAUM CNRS, Université du Maine, Avenue Olivier Messiaen, 72085 LE MANS Cedex 9, France. pascal.picart@univ-lemans.fr
Tankam
Patrice
P
Mounier
Denis
D
Peng
Zu-jie
ZJ
Li
Jun-chang
JC
D000465:Algorithms; D003116:Color; D003124:Colorimetry / Q000379:methods*; D006696:Holography / Q000379:methods*; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D012031:Refractometry / Q000379:methods*