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Jpeg-Ls: Akshit Chheda (1891004) Jaladhi Sonagara (1991106)

JPEG-LS is a lossless/near-lossless image compression standard that consists of two main stages: modelling and encoding. It divides the compression process into spatial pixel prediction and entropy coding phases, using contexts in both phases. The core is based on the LOCO-I algorithm which relies on prediction, residual modelling, and context-based coding of the residuals. JPEG-LS also provides a lossy mode where the maximum error is controlled by the encoder. The main advantage of JPEG-LS is its low complexity.

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124 views6 pages

Jpeg-Ls: Akshit Chheda (1891004) Jaladhi Sonagara (1991106)

JPEG-LS is a lossless/near-lossless image compression standard that consists of two main stages: modelling and encoding. It divides the compression process into spatial pixel prediction and entropy coding phases, using contexts in both phases. The core is based on the LOCO-I algorithm which relies on prediction, residual modelling, and context-based coding of the residuals. JPEG-LS also provides a lossy mode where the maximum error is controlled by the encoder. The main advantage of JPEG-LS is its low complexity.

Uploaded by

jaldhi sonagara
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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-LS Akshit Chheda(1891004)

Jaladhi Sonagara(1991106)
JPEG-LS
• JPEG-LS is a simple and efficient algorithm that mainly consists of two stages modelling
and encoding.
• it divides the whole compression process in two phases of spatial pixel prediction and
entropy coding and uses contexts in the first as well as the second phase.
• JPEG-LS is a lossless/near-lossless compression standard for continuous-tone images.
• It is a simple and efficient baseline algorithm which consists of two independent and distinct
stages called modelling and encoding.
Lossy Lossless

• Data is lost in compression/decompression • No data loss in compression/decompression


process process
• Data may be changed • Data is never changed
• Decoder can’t give back exactly same data • Decoder gives back exactly same data
• Lost data is unrecoverable . • Lost data is recoverable.
JPEG-LS
• The core of JPEG-LS is based on the LOCO-I algorithm, that relies on prediction, residual
modelling and context-based coding of the residuals.
• Besides lossless compression, JPEG-LS also provides a lossy mode ("near-lossless") where
the maximum absolute error can be controlled by the encoder.
• Main Advantage: Low complexity!
COMPARISON BETWEEN JPEG
,JPEG 2000, JPEG LS
JPEG JPEG 2000 JPEG LS
• It uses DCT(discrete cosine transform) • It uses dwt(discrete wavelength • It uses dp cm(differential pulse code
transform) modulation)
• Lossy compression method
• Lossy and lossless compression in same • Lossless compression method
• Block based segmentation of source file stream
image • It is predictive scheme based on 3 nearest
• It is file based approach neighbours
• Compression ratio 2:30
• Compression ratio 2:50 • Compression ratio 2:1
• Compression technologies used are
DCT ,perceptual quantization , zigzag • Compression technology ysed is • Compression technology used is contect
reordering, Huffman ,arithmetic coding wavemeter EBCOT. modeling prediction, arithmetic coding ,
etc.
• Applications are internet imaging , • Applications are printing , scanning
digital photography, etc. ,remote sensing, etc. • Applications are lossless or near lossless
coding of continuous to still images .
THANK YOU

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