Data Compression-Lossy Image Compression transform Coding Notes | EduRev

: Data Compression-Lossy Image Compression transform Coding Notes | EduRev

 Page 1


CSEP 590
Data Compression
Autumn 2007
Lossy Image Compression
Transform Coding
JPEG
Page 2


CSEP 590
Data Compression
Autumn 2007
Lossy Image Compression
Transform Coding
JPEG
CSEP 590 - Lecture 7 - Autumn 2007 2
Lossy Image Compression Methods
• DCT Compression
– JPEG
• Scalar quantization (SQ).
• Vector quantization (VQ).
• Wavelet Compression
– SPIHT
– UWIC (University of Washington Image Coder)
– EBCOT
– JPEG 2000
Page 3


CSEP 590
Data Compression
Autumn 2007
Lossy Image Compression
Transform Coding
JPEG
CSEP 590 - Lecture 7 - Autumn 2007 2
Lossy Image Compression Methods
• DCT Compression
– JPEG
• Scalar quantization (SQ).
• Vector quantization (VQ).
• Wavelet Compression
– SPIHT
– UWIC (University of Washington Image Coder)
– EBCOT
– JPEG 2000
CSEP 590 - Lecture 7 - Autumn 2007 3
JPEG Standard
• JPEG - Joint Photographic Experts Group
– Current image compression standard.  Uses 
discrete cosine transform, scalar quantization, and 
Huffman coding.
• JPEG 2000 uses to wavelet compression.
Page 4


CSEP 590
Data Compression
Autumn 2007
Lossy Image Compression
Transform Coding
JPEG
CSEP 590 - Lecture 7 - Autumn 2007 2
Lossy Image Compression Methods
• DCT Compression
– JPEG
• Scalar quantization (SQ).
• Vector quantization (VQ).
• Wavelet Compression
– SPIHT
– UWIC (University of Washington Image Coder)
– EBCOT
– JPEG 2000
CSEP 590 - Lecture 7 - Autumn 2007 3
JPEG Standard
• JPEG - Joint Photographic Experts Group
– Current image compression standard.  Uses 
discrete cosine transform, scalar quantization, and 
Huffman coding.
• JPEG 2000 uses to wavelet compression.
CSEP 590 - Lecture 7 - Autumn 2007 4
Barbara
original JPEG
VQ Wavelet-SPIHT
32:1 compression ratio
.25 bits/pixel (8 bits)
Page 5


CSEP 590
Data Compression
Autumn 2007
Lossy Image Compression
Transform Coding
JPEG
CSEP 590 - Lecture 7 - Autumn 2007 2
Lossy Image Compression Methods
• DCT Compression
– JPEG
• Scalar quantization (SQ).
• Vector quantization (VQ).
• Wavelet Compression
– SPIHT
– UWIC (University of Washington Image Coder)
– EBCOT
– JPEG 2000
CSEP 590 - Lecture 7 - Autumn 2007 3
JPEG Standard
• JPEG - Joint Photographic Experts Group
– Current image compression standard.  Uses 
discrete cosine transform, scalar quantization, and 
Huffman coding.
• JPEG 2000 uses to wavelet compression.
CSEP 590 - Lecture 7 - Autumn 2007 4
Barbara
original JPEG
VQ Wavelet-SPIHT
32:1 compression ratio
.25 bits/pixel (8 bits)
CSEP 590 - Lecture 7 - Autumn 2007 5
JPEG
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