Abstract
This paper presents a novel phase unwrapping architecture for accelerating the computational speed of digital holographic microscopy (DHM). A fast Fourier transform (FFT) based phase unwrapping algorithm providing a minimum squared error solution is adopted for hardware implementation because of its simplicity and robustness to noise. The proposed architecture is realized in a pipeline fashion to maximize throughput of the computation. Moreover, the number of hardware multipliers and dividers are minimized to reduce the hardware costs. The proposed architecture is used as a custom user logic in a system on programmable chip (SOPC) for physical performance measurement. Experimental results reveal that the proposed architecture is effective for expediting the computational speed while consuming low hardware resources for designing an embedded DHM system.
Highlights
Digital holographic microscopy (DHM) [1,2] is a highly effective means for non-invasively capturing the amplitude and phase data of an optically transparent or reflective specimen [3,4]
Such a phase unwrapping procedure is important in other applications, including synthetic aperture radar interferometry (InSAR) [6] and magnetic resonance imaging (MRI) [7]
For the digital holographic microscopy (DHM) or electronic speckle pattern interferometry applications, in addition to accurate unwrapped phase reconstructions, fast phase unwrapping operation is desired [8,9,10,11,12] for attaining realtime video rendering with high frame rates
Summary
Digital holographic microscopy (DHM) [1,2] is a highly effective means for non-invasively capturing the amplitude and phase data of an optically transparent or reflective specimen [3,4]. The phase map derived from the reconstructed image of a digital hologram is non-linearly wrapped lying in the interval To obtain the three-dimensional profile of a specimen, the wrapped phase map must be unwrapped to a continuous phase [5]. Such a phase unwrapping procedure is important in other applications, including synthetic aperture radar interferometry (InSAR) [6] and magnetic resonance imaging (MRI) [7]. For the DHM or electronic speckle pattern interferometry applications, in addition to accurate unwrapped phase reconstructions, fast phase unwrapping operation is desired [8,9,10,11,12] for attaining realtime video rendering with high frame rates
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