Low Complexity Compression and Speed Enhancement for Optical Scanning Holography.

Abstract:

:In this paper we report a low complexity compression method that is suitable for compact optical scanning holography (OSH) systems with different optical settings. Our proposed method can be divided into 2 major parts. First, an automatic decision maker is applied to select the rows of holographic pixels to be scanned. This process enhances the speed of acquiring a hologram, and also lowers the data rate. Second, each row of down-sampled pixels is converted into a one-bit representation with delta modulation (DM). Existing DM-based hologram compression techniques suffers from the disadvantage that a core parameter, commonly known as the step size, has to be determined in advance. However, the correct value of the step size for compressing each row of hologram is dependent on the dynamic range of the pixels, which could deviate significantly with the object scene, as well as OSH systems with different opical settings. We have overcome this problem by incorporating a dynamic step-size adjustment scheme. The proposed method is applied in the compression of holograms that are acquired with 2 different OSH systems, demonstrating a compression ratio of over two orders of magnitude, while preserving favorable fidelity on the reconstructed images.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Tsang PW,Poon TC,Liu JP,Kim T,Kim YS

doi

10.1038/srep34724

subject

Has Abstract

pub_date

2016-10-06 00:00:00

pages

34724

issn

2045-2322

pii

srep34724

journal_volume

6

pub_type

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