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L2+Slides - CS450 Lecture 2 Sampling Quantization Color...

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CS450 Lecture 2 Sampling, Quantization, Color Models & Indexed Color
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Digital Cameras Scanned Film & Photographs Digitized TV Signals Computer Graphics Radar & Sonar Medical Imaging Devices (X-Ray, CT) The Internet Digital Image Sources
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Images are digitized using a two step process: 1. sampling the continuous tone image 2. quantizing pixels Digitizing Images
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Sampling
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pixel’s samples are averaged Quantization
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Quantization Example
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Image Resolution 68 x 104 136 x 208 272 x 416 less detail more detail less storage more storage
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Digital Cameras Low-Res 640x480 (TV grade) Medium Low-Res 1536x1024 Medium-Res 2048x1536 Medium Hi-Res 2560x1920 Hi-Res 3000x2000 up to 10 Megapixel
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Dynamic Range 256 levels The number of quantized pixel values: 16 levels 4 levels 2 levels
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Binary Images (pixel values = 0,1) Grayscale Images (pixel values = 0-255) Color Images Each pixel has three color components For example, (red, green, blue) or RGB Each color component is 0-255 Images - 2D array of values
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3 Images Overlayed Color Images Red Green Blue
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