Abstract
Speckle noise is a well-documented problem on coherent imaging techniques like Digital Holography. A method to reduce the speckle noise level is presented, based on introducing a Digital Micromirror Device to phase modulate the illumination over the object. Multiple holograms with varying illuminations are recorded and the reconstructed intensities are averaged to obtain a final improved image. A simple numerical resampling scheme is proposed to further improve noise reduction. The obtained results demonstrate the effectiveness of the hybrid approach.
Highlights
Robust and versatile imaging techniques are always at the forefront of development in engineering and sciences
We presented an alternative methodology to reduce speckle on digital holographic imaging based on a Digital Micromirror Device (DMD) device
A random 3D resampling of the original hologram stack allows obtaining newly composed holograms
Summary
Robust and versatile imaging techniques are always at the forefront of development in engineering and sciences. When coherent light strikes an object with rough surfaces scaled to the visible wavelength range, a coherent noise or speckle appears The hologram stores this noise along with the object information, and its presence extends to the reconstructed image deteriorating its quality. They can be categorized, according to the number of holograms registered, into multiple and single-shot strategies According to their approach, they can be divided into two categories: optical and numerical operations. We propose the use of a DMD which is known to be a more robust and experimentally approachable device that offers a high speed of operation as it has been documented in the past [18] with its adaptation to a holographic setup This feature allows us to implement synchronous registering with the camera at high frame rates reducing the constraints of this approach for dynamic applications. We evaluated our technique with different illumination phase patterns and demonstrate that the reduction in the speckle noise is significant
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