Week 7 - Run-length encoding • Delta Encoding • Huffman...

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Week 7 17:36 Representing Info Text Numbers Graphics o Digitizing (Real world   Digital media) Sampling : Resolution Quantization : Bit Depth o Synthesize (create) Photoshop Illustrator Bitmap Vector Graphics Data Compression o Eliminate Redundancy  Extra Unnecessary Information Increase Realiability Reduce
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17:36 Redundancy Extra uncessary information (but enhances realiability) Compression Eliminate (some redundancy) Data Compression Lossless compression o Zip “Lossy” compression o JPEG o MP3 Much better compression (smaller compressed file) Lossless Compression
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Unformatted text preview: Run-length encoding • Delta Encoding • Huffman coding/Morse code • LZW (Lempel Ziv Welch) Semantic Compression (vs Syntatic) • Better, know about data • Worse, specific to that kind of data o 1-949-824-5072 = 14 bytes o 9498255072 (BCD) = 5 bytes 17:36 Storage Hierarchy • Registers- dozen • RAM – GB • Hard Drive • Solid-state Drive • Disk- Medium Drive-Machine Read/Write Head Head Crash • Electronic (solid state) o Faster, cheaper, more reliable • Mechanical o Slow, expensive, unreliable 17:36...
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Week 7 - Run-length encoding • Delta Encoding • Huffman...

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