Automatic focusing method for lensless digital holographic imaging

Automatic focusing method for lensless digital holographic imaging

The invention provides an automatic focusing method for lensless digital holographic imaging, and the method comprises the steps: carrying out back propagation on a holographic image, and obtaining a holographic reconstruction image; taking guide filtering as a blurred image function, and calculatin...

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Hauptverfasser: JIANG XIAOMIN, ZHAO MING, QI AOBING, WANG YUNKE, FAN HAOXING
Format: Patent
Sprache:chi ; eng
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CINEMATOGRAPHY
ELECTROGRAPHY
HOLOGRAPHIC PROCESSES OR APPARATUS
HOLOGRAPHY
PHOTOGRAPHY
PHYSICS
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creator JIANG XIAOMIN
ZHAO MING
QI AOBING
WANG YUNKE
FAN HAOXING
description The invention provides an automatic focusing method for lensless digital holographic imaging, and the method comprises the steps: carrying out back propagation on a holographic image, and obtaining a holographic reconstruction image; taking guide filtering as a blurred image function, and calculating a direction information difference value between the reconstructed image and the blurred image by adopting a gradient vector square function to obtain an evaluation function of the holographic reconstructed image; and combining a golden section search method with an evaluation function, determining an optimal defocusing amount, and obtaining an optimal reconstructed image. According to the method, a reconstructed holographic image is blurred by adopting a guide filter, and information of the reconstructed image and information of a blurred image in different directions are extracted respectively. The optimal defocusing amount is determined by comparing the change conditions of the direction information of the rec
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subjects CINEMATOGRAPHY
ELECTROGRAPHY
HOLOGRAPHIC PROCESSES OR APPARATUS
HOLOGRAPHY
PHOTOGRAPHY
PHYSICS
title Automatic focusing method for lensless digital holographic imaging
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