Han.ppt

What is JPEG 2000 Robert Han ECE533 Final Project Presentation University of Wisconsin - Madison

Project Contents  JPEG2000 Background information  Introduction of KAKADU software  JPEG2000 image implementation – KAKADU software

 JPEG VS JPEG2000 Performance comparison

 JPEG2000 Background information  Introduction of KAKADU software  JPEG2000 image implementation – KAKADU software

 JPEG VS JPEG2000 Visual Performance Comparison

JPEG2000 - Background information  A new image-encoding standard that provides a feature set vital to many high end and emerging imaging applications.  Provides high compression with image quality superior to all existing standard encoding techniques.  Wavelet-based compression  Represent complex structures in the image  Store compressed data in hierarchical format  Compressing an extremely large amount of image data into a relatively small amount of compressed data  Compressed image can then be sent to a device in the resolution that best fits without additional storage overhead.

 File structure flexibility - Could be used for a variety of applications such as  Internet, Digital Photography,  Medical Imaging, Wireless Imaging..

Main Differences JPEG

JPEG2000

 Created for natural images

 Created for computer generated images

 Discrete Cosine Transform algorithm

 Discrete Wavelet Transform algorithm

 File extension : .jpg or .jpeg

 File extention : .jp2, .jpx, .jpf, .mj2

 Currently applicable to most of applications

 Currently NOT widely used

 Web, imaging software, office ..

Basic Architecture of standard Source image data

Forward transform

Quantization

Entropy encoding

Compressed image data

 JPEG2000 Background information  Introduction of KAKADU software  JPEG2000 image implementation – KAKADU software

 JPEG VS JPEG2000 Visual Performance Comparison

The KAKADU software 

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A complete implementation of the JPEG2000 standard Part 1. A Comprehensive implementation for several of the most useful features from Part 2 Provides a solid foundation for a range of commercial and non-commercial applications

The KAKADU software 

Image and volume compression

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Image and volume decompression/rendering

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Transcoding between related representation

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Interactive rendering applications

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Client-server applications

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Digital Cinema applications

The KAKADU software

 JPEG2000 Background information  Introduction of KAKADU software  JPEG2000 image implementation – KAKADU software

 JPEG VS JPEG2000 Visual Performance Comparison

JPEG2000 Implementation 

Reducing layers

Original Image

JPEG2000 Image With 5 layers

JPEG2000 Image With 1 layer

JPEG2000 Implementation 

Flips

Original Image

Horizontal flip

Vertical flip

JPEG2000 Implementation 

Single component mode

Original Image

First component

Last component

JPEG2000 Implementation 

Adding metadata

Adding codestream

Adding codestream

Adding codestream

 JPEG2000 Background information  Introduction of KAKADU software  JPEG2000 image implementation – KAKADU software

 JPEG VS JPEG2000 Visual Performance comparison

Visual Performance Comparison 

Color Image Png format File size : 439kb

JPEG2000, 10:1 File size : 76.8kb

JPEG2000, 50:1 File size : 15.4kb

JPEG2000, 100:1 File size : 7.78kb

JPEG 100% quality File size : 247kb

JPEG 50% quality File size : 34.7kb

JPEG 0% quality File size : 23.4kb

Visual Performance Comparison 

Grayscale Image

Jpeg2000, 100:1

File size : 4.54kb

Jpeg2000, 50:1

File size : 24.5kb

Jpeg2000, 10:1

File size : 156kb

Jpeg, 0% quality

File size : 41.7kb

Jpeg, 50% quality

File size : 79.1kb

Jpeg, 100% quality

File size : 193kb

Visual Performance Comparison Scanned Document

 Saved as png format Scanned at 300 dpi

Saved as jpeg format jpeg2000 format Scanned at 150 dpi

jpeg format

Saved as Jpeg2000 format Scanned at 150 dpi

Visual Performance Comparison  Jpeg2000, 100:1

Cartoon Image- Created by Photoshop File size : 54.6kb

Jpeg2000, 50:1

JPEG2000 image

Jpeg, 0% quality

File size : 77.8kb

File size : 114kb

Jpeg2000, 10:1

File size : 243kb

JPEG image

Jpeg, 50% quality

File size : 109kb

Jpeg, 100% quality

File size : 278kb

Conclusion 

JPEG2000 standard shows improved features over JPEG standard

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JPEG2000 reduced the image size while enhanced the image quality

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JPEG2000 is not yet widely used but getting more attention

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It is expected that JPEG2000 standard will become the one of most widely used image compression standard in very near future

Questions?