Imaging method of structured illumination digital holography

Patent metadata

Field	Value
Publication number	US-10613478-B2
Application number	US-201715816199-A
Country	US
Kind code	B2
Filing date	Nov 17, 2017
Priority date	Aug 8, 2017
Publication date	Apr 7, 2020
Grant date	Apr 7, 2020

Abstract

A method of structured illumination digital holography includes: (a) providing a structured illumination generating unit and binarization random number encoding unit to generate a coded structured illumination pattern; (b) sampling at least two patterns with phase shift which synthesized as a single structured illumination pattern to be encoded; (c) forming a single digital hologram, and wavefront reconstructing the single digital hologram; (d) performing a compressive sensing approach to recover the object wave with at least two phase shift patterns; and (e) reconstructing the separation of overlap spectrum, to obtain an image covering bandpass spectrum with different high frequency and low frequency.

First claim

What is claimed is:

1. An imaging method of structured illumination digital holography, comprising
(a) providing a structured illumination generating unit and a binary random number encoding unit to generate a structured illumination pattern;
(b) based on at least two sheets of binary random number encoding patterns of said structured illumination pattern, sampling at least two sheets of patterns with phase shift to be synthesized as a single sheet of structured illumination pattern to be encoded;
(c) interfering an encoded structured object wave with a reference wave to form a single sheet of digital hologram, and wavefront reconstructing said single sheet of digital hologram;
(d) random number decoding said single sheet of digital hologram to extract object wave with corresponding original phase shift pattern, and performing an image processing approach to recover object wave with at least two sheets of phase shift patterns; and
(e) reconstructing separation of overlap spectrum of said object wave with at least two sheets of phase shift patterns.

2. The method of claim 1 , wherein said encoded structured object wave is formed by said single sheet of encoded structured illumination pattern illuminating an object.

3. The method of claim 1 , wherein said random number decoding in said step (d) is binary random number decoding.

4. The method of claim 1 , wherein said step (e) is to obtain an image covering bandpass spectrum with different high frequency and low frequency.

5. The method of claim 4 , wherein said bandpass spectrum with different high frequency and low frequency includes two-dimensional or three-dimensional Fourier spectrum.

6. The method of claim 1 , wherein said image processing approach in said step (d) includes a compressive sensing approach.

7. The method of claim 1 , wherein said image processing approach in said step (d) includes a de-convolution approach.

8. The method of claim 1 , wherein said image processing approach in said step (d) includes an interpolation approach.

Assignees

• Univ Nat Taiwan Normal

Inventors

• Cheng Chau-Jern
• Lai Xin-Ji

Classifications

• G03H2001/0445

  Off-axis recording arrangement (G03H2001/0456 takes precedence) · CPC title

• G03H1/0443

  Digital holography, i.e. recording holograms with digital recording means (holobject computation G03H1/0866) · CPC title

• G03H2001/0452

  arranged to record an image of the object · CPC title

• G03H1/0465

  Particular recording light; Beam shape or geometry (G03H1/06 takes precedence) · CPC title

• G03H1/16

  using Fourier transform ({G03H1/10}, G03H1/12, G03H1/14 take precedence; analogue computers G06G, e.g. G06G7/19) · CPC title