A method for compressing off-axis digital hologram with spectrum shifting

Yong Li; Fang Song; Hui Wang; Hongzhen Jin; Haihua Zhang

doi:10.1117/12.754682

4 January 2008 A method for compressing off-axis digital hologram with spectrum shifting

Yong Li, Fang Song, Hui Wang, Hongzhen Jin, Haihua Zhang

Proceedings Volume 6832, Holography and Diffractive Optics III; 68320A (2008) https://doi.org/10.1117/12.754682
Event: Photonics Asia 2007, 2007, Beijing, China

Abstract

Large amounts of communication bandwidth and memory space is occupied to transmit and store digital hologram on account of its enormous data volume. It is necessary to compress the information of digital hologram for effective transmittance and storage. After theory of off-axis hologram is studied, it is found that at most half of the information is useful for reconstructing image. A new method is proposed to compress the information, according to the spectrum character of off-axis hologram. The sampling frequency is reduced by shifting the useful information of digital hologram from high-frequency section to low-frequency section. Therefore, the information is compressed. The detailed procedure is expressed as follows. (1) To filter the hologram with a high-pass filter, whose cut off frequency is equal to the difference between frequency of reference beam and the highest frequency of object beam. (2) To multiply every row of the filtered hologram by a cosine sequence, whose frequency is equal to the difference between frequency of reference beam and the highest frequency of object beam. (3) To filter the processed hologram with a low-pass filter. (4) To subsample the hologram with a sampling frequency as four times as the highest frequency of the object. As thus, the digital hologram is compressed to half size of the original one at least. Moreover, higher compression rate will be obtained if the subsampled hologram is compressed with other methods. The theoretical analysis and experimental results are presented.

Citation Download Citation

Yong Li, Fang Song, Hui Wang, Hongzhen Jin, and Haihua Zhang "A method for compressing off-axis digital hologram with spectrum shifting", Proc. SPIE 6832, Holography and Diffractive Optics III, 68320A (4 January 2008); https://doi.org/10.1117/12.754682

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

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
8 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Holograms

Digital holography

3D image reconstruction

Linear filtering

Image compression

Image quality

Data communications

Show All Keywords

Keywords/Phrases

Search In:

Publication Years