Reduced memory JPEG decompression for mobile devices

Elias Z. Ioup; Hillary Mesick; John T. Sample; Frank P. McCreedy

doi:10.1117/12.665248

2 May 2006 Reduced memory JPEG decompression for mobile devices

Elias Z. Ioup, Hillary Mesick, John T. Sample, Frank P. McCreedy

Proceedings Volume 6250, Mobile Multimedia/Image Processing for Military and Security Applications; 625001 (2006) https://doi.org/10.1117/12.665248
Event: Defense and Security Symposium, 2006, Orlando (Kissimmee), Florida, United States

Abstract

Imagery makes up a large percentage of geospatial data in use today. One feature of this imagery is that it tends to be large, often hundreds or thousands of megabytes. As a result JPEG compression is often used to make geospatial imagery manageable by reducing the file size without greatly reducing the quality of the image. However, the benefits of compression are absent when the image must be viewed. Viewing a large JPEG image requires decompressing and holding the uncompressed version in memory. Holding the entirety of a large image in memory is a burden on many systems and sometimes impossible. However, the entire image is rarely needed at full resolution. Usually only a small area of interest is viewed or processed. This paper describes a method of removing a small area of interest from a large JPEG without decompressing the entire image. JPEG compressed images are streams which cannot be randomly accessed. Viewing a particular area requires that all preceding areas be partially decompressed. This process is more efficient than fully decompressing the whole JPEG, but depending on the area requested the entire image may need to be partially decompressed. To circumvent this problem an index file is created on first decompression which records markers for the sections of the JPEG. The index file allows random access to the JPEG file so that areas may be decompressed without reading the preceding portions of the JPEG. This method of decompressing a JPEG requires a limited amount of memory and with an index file is fast enough to be performed in real time.

Citation Download Citation

Elias Z. Ioup, Hillary Mesick, John T. Sample, and Frank P. McCreedy "Reduced memory JPEG decompression for mobile devices", Proc. SPIE 6250, Mobile Multimedia/Image Processing for Military and Security Applications, 625001 (2 May 2006); https://doi.org/10.1117/12.665248

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
9 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Image compression

Computer programming

Mobile devices

Image processing

Java

Quantization

Image quality

Show All Keywords

Keywords/Phrases

Search In:

Publication Years