UCSB ECE 160 - Multimedia (39 pages)

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Multimedia



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Multimedia

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Lecture Notes


Pages:
39
School:
University of California, Santa Barbara
Course:
Ece 160 - Multimedia Systems

Unformatted text preview:

ECE160 Multimedia Lecture 3 Spring 2011 Graphics and Image Data Representations ECE160 Spring 2011 Lecture 3 Graphics and Image Data Representations 1 Graphics and Image Data Representations Graphics Image Data Types The number of file formats used in multimedia continues to proliferate For example a list of some file formats used in the popular product Macromedia Director ECE160 Spring 2011 Lecture 3 Graphics and Image Data Representations 2 1 bit Images Each pixel is stored as a single bit 0 or 1 so also referred to as binary image Such an image is also called a 1 bit monochrome image or a pure black white image since it contains no color We show a sample 1 bit monochrome image called Lena by multimedia scientists this is a standard image used to illustrate many algorithms ECE160 Spring 2011 Lecture 3 Graphics and Image Data Representations 3 8 bit Gray scale Images Each pixel has a gray value between 0 and 255 Each pixel is represented by a single byte e g a dark pixel might have a value of 10 and a bright one might be 230 Bitmap The two dimensional array of pixel values that represents the graphics image data Image resolution refers to the number of pixels in a digital image higher resolution always yields better quality Fairly high resolution for such an image might be 1600x1200 whereas lower resolution might be 640x480 ECE160 Spring 2011 Lecture 3 Graphics and Image Data Representations 4 Multimedia Presentation Each pixel is usually stored as a byte a value between 0 to 255 so a 640x480 grayscale image requires 300 kB of storage 640x480 307200 We show the Lena image again but this time in grayscale ECE160 Spring 2011 Lecture 3 Graphics and Image Data Representations 5 Dithering When an image is printed the basic strategy of dithering is used which trades intensity resolution for spatial resolution to provide ability to print multi level images on 2 level 1 bit printers Dithering calculates patterns of dots such that values from 0 to 255 correspond to patterns



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