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JPEG 2000 is an advanced image compression standard developed to enhance the limitations of the original JPEG, offering superior compression efficiency, scalability, and support for both lossless and lossy compression. Key features include progressive transmission, region of interest coding, and enhanced error resilience, utilizing Discrete Wavelet Transform for better image quality. While it provides significant advantages in various applications like medical imaging and digital cinema, it also faces challenges such as higher computational complexity and slower processing times.

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10 views34 pages

Dip Unit-V

JPEG 2000 is an advanced image compression standard developed to enhance the limitations of the original JPEG, offering superior compression efficiency, scalability, and support for both lossless and lossy compression. Key features include progressive transmission, region of interest coding, and enhanced error resilience, utilizing Discrete Wavelet Transform for better image quality. While it provides significant advantages in various applications like medical imaging and digital cinema, it also faces challenges such as higher computational complexity and slower processing times.

Uploaded by

Tejaswi Tejaswi
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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JPEG 2000 Standards - Image Processing Notes

1. Introduction to JPEG 2000

 JPEG 2000 is an image compression standard and coding system developed by the Joint
Photographic Experts Group (JPEG) in the year 2000.
 It was designed to overcome the limitations of the original JPEG standard, providing
superior compression efficiency, scalability, and flexibility.
 JPEG 2000 supports both lossless and lossy compression.

2. Key Features of JPEG 2000

 Improved Compression Efficiency: Better image quality at lower bit rates compared to
traditional JPEG.
 Lossless and Lossy Compression: A single architecture supports both types of
compression.
 Progressive Transmission: Allows images to be transmitted and reconstructed
progressively, enhancing user experience.
 Region of Interest (ROI) Coding: Specific parts of the image can be compressed at
higher quality.
 Error Resilience: Enhanced error handling for transmission over unreliable channels.
 Scalability: Image resolution and quality can be scaled without re-encoding.

3. Architecture of JPEG 2000

 Discrete Wavelet Transform (DWT): Used instead of the Discrete Cosine Transform
(DCT) in traditional JPEG. DWT provides better energy compaction and fewer artifacts.
 Quantization: Scalar quantization applied to wavelet coefficients.
 Entropy Coding: Utilizes Embedded Block Coding with Optimized Truncation
(EBCOT) for efficient bitstream formation.
 File Format: JPEG 2000 files use the .jp2 extension for still images and .mj2 for motion
sequences.

4. Comparison with Traditional JPEG

Feature JPEG JPEG 2000


Compression Type DCT DWT
Compression Efficiency Moderate High
Lossless Compression No Yes
Progressive Transmission Limited Yes
Region of Interest (ROI) No Yes
Scalability No Yes
Error Resilience Low High
5. Applications of JPEG 2000

 Medical Imaging: High-fidelity image compression for medical diagnostics.


 Satellite and Remote Sensing: Efficient storage and transmission of large satellite
images.
 Digital Cinema: High-resolution and lossless image compression.
 Art and Cultural Heritage: Archiving high-quality images of artworks.
 Wireless Imaging: Error resilience for images transmitted over wireless networks.

6. Advantages and Disadvantages

 Advantages:
o High compression efficiency.
o Supports large images.
o Multiple resolutions from a single compressed file.
o Enhanced error resilience.
 Disadvantages:
o Higher computational complexity.
o Slower encoding and decoding times.
o Less widespread hardware and software support compared to traditional JPEG.

7. Visual Representation of JPEG 2000 Process

Image 1: JPEG 2000 Compression Flowchart

 Shows the steps of image compression including DWT, quantization, and entropy coding.

Image 2: Comparison of JPEG and JPEG 2000 Artifacts

 Visual comparison of image quality between JPEG and JPEG 2000 at the same
compression ratio.

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