Iterative digital in-line holographic reconstruction with improved resolution by data interpolation

Mingjun Wang; Jigang Wu

doi:10.1117/12.2071694

11 November 2014 Iterative digital in-line holographic reconstruction with improved resolution by data interpolation

Mingjun Wang, Jigang Wu

Proceedings Volume 9271, Holography, Diffractive Optics, and Applications VI; 927110 (2014) https://doi.org/10.1117/12.2071694
Event: SPIE/COS Photonics Asia, 2014, Beijing, China

Abstract

Digital in-line holography (DIH) is a lensless imaging technique that can be used to build low-cost and compact imaging systems. In DIH, the in-line hologram is recorded by a CMOS or CCD sensor and later used to reconstruct the image of the sample. The imaging resolution is determined by the system numerical aperture provided that the pixel size is smaller than the required Nyquist criteria for sampling distance. In the case of short sample-to-sensor distance, pixel size is often a limiting factor for the resolution. To solve this problem, we propose to use iterative method along with data interpolation for the holographic reconstruction. Proof-of-concept numerical simulations have been done to show the effectiveness of our method. In our algorithm, the optical field is propagated back and forth between the sample plane and the sensor plane while using the measured intensity and a priori information about the sample as constraints, following Gerchberg-Saxton and Fienup’s methods. The iteration will converge and we can get both intensity and phase information of the sample. Before the iteration, the intensity data matrix measured by the sensor is interpolated to enlarge the matrix dimension and thus effectively reduce the pixel size. During the iteration, we apply the sensor plane constraints on only the measured intensity location but not the interpolated data location. In our simulation, we observed that during the iteration, the interpolated data will be changed reasonably and we can finally reconstruct the sample image with better resolution.

Citation Download Citation

Mingjun Wang and Jigang Wu "Iterative digital in-line holographic reconstruction with improved resolution by data interpolation", Proc. SPIE 9271, Holography, Diffractive Optics, and Applications VI, 927110 (11 November 2014); https://doi.org/10.1117/12.2071694

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available