Lec7 - IEG 4190 Lecture Notes 7 Lecturer Jianzhuang Liu...

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1 IEG 4190 Lecture Notes 7; Lecturer: Jianzhuang Liu Outline: 1. Pulse Code Modulation (PCM) 2. Transform Image Coding 3. Image Model Coding 4. Color Image Coding
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2 Pulse Code Modulation Waveform coding: code the image intensity itself. Very simple 12 (, ) fnn ˆ ) f nn Typically requires over 5-6 bits/pixel for good quality False contours for low bit rate case Nonuniform quantizer is useful when f p is substantially different from uniform density Uniform Quantizer Reconstruction levels Signal
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3 Pulse Code Modulation, cont’d Original image PCM-coded 2 bits/pixel 4 grey levels False contours (signal-dependent quantization noise) signal-dependent quantization noise signal-independent quantization noise 1 ˆ f f ˆ || ff
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4 Pulse Code Modulation, cont’d Improvements of PCM
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5 Pulse Code Modulation, cont’d Example: f ˆ f ˆ f ˆ f
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6 Pulse Code Modulation, cont’d Original image PCM-coded 2 bits/pixel (4 grey levels) PCM-coded 2 bits/pixel (4 grey levels) with Roberts’s pseudonoise technique PCM-coded 2 bits/pixel (4 grey levels) with Roberts’s pseudonoise technique + noise reduction
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7 Transform Image Coding
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Lec7 - IEG 4190 Lecture Notes 7 Lecturer Jianzhuang Liu...

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