Abstract
Relighting is an important technique in photography which enables the optical properties of a picture to be modified without retaking it again. However, different from an optical image, a digital hologram cannot be relit by simply varying the value of individual pixel, as each of them is representing holistic information of the entire object scene. In this paper, we propose a fast method for the relighting of a digital hologram. First, the latter is projected to a virtual wavefront recording plane (WRP) that is located close to the object scene. Next, the WRP is relit, and subsequently expanded into a full hologram. Experiment results have demonstrated that our proposed method is capable of relighting a 2048x2048 hologram at a rate of over 50 frames per second. To the best of our knowledge, this is the first time relighting is considered in the context of holography.
Highlights
In traditional photography, it is often necessary to modify a picture to enhance its visual quality, or to create special effects that are absent in the image acquisition process
We propose a fast method for relighting digital hologram without the presence, or the reconstruction of the original object scene
Our scheme is based on the wavefront recording plane (WRP) which is originally employed in fast generation of digital holograms [1] [9]
Summary
It is often necessary to modify a picture to enhance its visual quality, or to create special effects that are absent in the image acquisition process. The problem is, rendering a digital hologram with the point process is erroneous, as each pixel is representing the holistic information from the entire object scene. We propose a fast method for relighting digital hologram without the presence, or the reconstruction of the original object scene.
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