Ch. 7 - Digital Images and Videos

Ch. 7 - Digital Images and Videos - 2/25/2010 CIS 3003...

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2/25/2010 1 CIS 3003 Fundamentals of Information Technology 1 Information Technology in Theory By Pelin Aksoy and Laura DeNardis Chapter 7 Digital Images and Video CIS 3003 Fundamentals of Information Technology 2 Objectives ± Learn how images are digitized ± Understand the technical features and mathematical calculations that determine the bit size of a digital image ± Understand the process by which digital video is 2 Understand the process by which digital video is made Information Technology in Theory
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2/25/2010 2 CIS 3003 Fundamentals of Information Technology 3 Objectives (continued) ± Identify the factors that affect the quality of digital Identify the factors that affect the quality of digital images ± Learn about popular digital image and video file formats ± Understand the technical attributes of different types of display technologie 3 of display technologies Information Technology in Theory CIS 3003 Fundamentals of Information Technology 4 Imaging Technologies ± Traditional camera o Invented more than a century ago o Captures images with a few simple components: ² Lens ² Shutter system ² Photographic medium such as film Light from the object is focused by the lens the quick 4 o Light from the object is focused by the lens, the quick shutter action exposes the film to light, and the image is permanently captured on film o The film is then developed and printed on photographic paper Information Technology in Theory
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2/25/2010 3 CIS 3003 Fundamentals of Information Technology 5 Digitizing Images and Video ± A digital image is an electronic file made up of a string of 1s and 0s when stored on a medium ± When the image file is accessed and shown on a display screen or monitor, it is called a pixelized image ± Composed of many elementary units called pixels 5 (short for picture elements), each containing a single unit of color information ± A pixelized image is similar to a mosaic Information Technology in Theory CIS 3003 Fundamentals of Information Technology 6 Mosaic Image 6 Information Technology in Theory
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2/25/2010 4 CIS 3003 Fundamentals of Information Technology 7 Pixelized Images 7 Information Technology in Theory CIS 3003 Fundamentals of Information Technology 8 A Bitmap Image 8 Information Technology in Theory
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2/25/2010 5 CIS 3003 Fundamentals of Information Technology 9 Vector Graphics Images are represented in the form of mathematical expressions Parameters can include attributes such as orientation, length, width, and color Takes up less storage space than bitmap images Can be easily scaled without degradation in quality 9 and resolution Useful for representing geometric shapes but not effective for photographs Information Technology in Theory CIS 3003 Fundamentals of Information Technology 10 Capturing Color Images Using Digital Cameras Lens system • Lens system • Sensor array • Filter system •M em o r y • Processor
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Ch. 7 - Digital Images and Videos - 2/25/2010 CIS 3003...

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