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13_CM0340_Summary

13_CM0340_Summary - greyscale true-colour • Compression...

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573 JJ II J I Back Close Summary What we have learned in this module? Different multimedia data and their representations Audio Image/Graphics Video Colour model and perception Different colour models (benefits and applications): RGB, CMYK, YUV, YIQ, L*a*b*. .. Chroma subsampling (why and how)
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574 JJ II J I Back Close Fundamental Tools Nyquist theorem Fourier Transform and Discrete Cosine Transform: Frequency Analysis Information theory and basic compression techniques: Run-length encoding Entropy encoding (Shannn-Fano, Huffman, arithmetic) LZW Predictive/Differential encoding Frequency Domain Compression Vector Quantisation
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575 JJ II J I Back Close Audio Processing: Digital Audio Effects [CM0268] Synthesis: Additive, Subtractive, FM, Wavetable, Sample-based, Granular, Physical Compression: Traits of human hearing system MPEG Audio, Dolby AC Representation: MIDI, MPEG-4 Structured Audio
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576 JJ II J I Back Close Image Representations: monochrome (dithering), index (LUT),
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Unformatted text preview: greyscale, true-colour • Compression: – What to exploit? – JPEG: true colour – GIF: index 577 JJ II J I Back Close Video • Compression: – What to exploit? – Motion Compensation based Prediction (H.261) – Bidirectional (B) frames (MPEG-1/2) – Object-based coding, synthetic objects (MPEG-4) – Various technical improvements: flexible macroblock partition, subpixel motion estimation, multiple references etc. (MPEG-4 AVC) 578 JJ II J I Back Close Beyond the Material • Problem-solving skills, e.g. the development of various methods for video compression • Identify the challenge: what is the real problem? • Learn the nature: what to exploit? • Understand the practice: e.g. encoder / decoder balance • Push forward: how can we do better? • Last but not least, curiosity and enthusiasm!...
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13_CM0340_Summary - greyscale true-colour • Compression...

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