lect.21 - EEL 5722C Field-Programmable Gate Array Design...

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1 EEL 5722C Field-Programmable Gate Array Design Lecture 21: Final Project: JPEG Decoding Algorithms and Implementations Prof. Mingjie Lin * Stanford EE271 notes
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2 Overview Huffman Encoding and Decoding – Ideas and concepts – How
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3 JPEG-Lite The input has been modified to 4x4 blocks as opposed to the 8x8 blocks used in the JPEG standard in order to reduce the layout effort of hardware elements A simplified Huffman table will be used by the Encoder and Decoder that contains 10-bit Huffman codes and allows a maximum run-length of 3. The JPEG-baseline standard contains 16-bit Huffman codes and supports a maximum run-length of 15. Only a single AC and a single DC Huffman table will be used. In the JPEG baseline standard, two AC and DC tables were supported. 1-bit Huffman codes are not allowed in JPEG-lite. • Only grayscale images will be decoded in JPEG-lite.
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4 Example: a 4x4 block encoded on a bitstream .
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5 JPEG Decoding Flow
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6 Why Huffman Decoding is hard? The difficulty in decoding the bitstream arises in
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This note was uploaded on 11/23/2011 for the course EEL 5722c taught by Professor Lin during the Spring '11 term at University of Central Florida.

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lect.21 - EEL 5722C Field-Programmable Gate Array Design...

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