jpeg2000 - 1 JPEG2000: New Standard for Still Image...

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Unformatted text preview: 1 JPEG2000: New Standard for Still Image Compression Tao Tao Department of Computer Science University of Central Florida Some of the slides have been adopted from a presentation by Dr. T. Acharya 2 Outline Introduction Part I JPEG2000 Coding Region of Interest Bit-stream ordering Conclusion 3 Introduction 4 Original image 5.2 bpp b i t s t r e a m l o s s y lossless S u b-r e g io n One component 1.84 bpp L o w e r r e s o l u t i o n R O I 1.89 bpp Why JPEG2000 ? 5 Why another still image compression standard? To address a number of weakness in the existing JPEG standard. To provide a number of new features that available in the JPEG standard. Namely, Allow efficient lossy and lossless compression within a single unified coding framework. Provide superior image quality at low bit rates. Support new features such as ROI and a more flexible file format. Avoid excessive computational and memory complexity. 6 Why another still image compression standard (cont.)? Larger image. JPEG does not allow for image greater than 64k by 64k without tiling Transmission in noisy environment. JPEG image quality suffers dramatically when bit-errors are encountered. Computer generated imagery. JPEG is optimized for natural imagery only. Compound documents. JPEG is seldom used in the compression of compound documents because of its poor performance on bi- level (text) imagery. 7 8 9 10 11 12 13 14 15 16 17 18 19 JPEG 2000 Standard Part I : Core Coding System Part II : Extensions Part III : Motion JPEG 2000 Part IV : Conformance Testing Part V : Reference Software Part VI : Compound image file format More parts are coming 20 Part I JPEG 2000 21 JPEG 2000 - Part I Multi component transform Image Discrete Wavelet Transform Quantization Rate Control Tier-1 Encoder Tier-2 Encoder Coded Image Inverse Multi component transform Reconstructed Image Inverse Wavelet Transform De-quantization Tier-1 Decoder Tier-2 Decoder Coded Image encoder encoder decoder decoder 22 JPEG2000 Encoder BPC BAC DWT Context & Data Layer formation and data formatting Compressed data Tile code block Bit stream Subband Image Component tile Subbands Subband Subband Subband Code block Code block 23 Multi-Component Transform Part I allows color transformation on first three components Reversible Color Transform (RCT) Irreversible Color Transform (ICT) Multi component transform Image...
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This note was uploaded on 06/09/2011 for the course CAP 5015 taught by Professor Mukherjee during the Spring '11 term at University of Central Florida.

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jpeg2000 - 1 JPEG2000: New Standard for Still Image...

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