Chapter 7 - Information Technology in Theory By Pelin Aksoy...

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Information Technology in Theory Chapter 7 Digital Images and Video Information Technology in Theory By Pelin Aksoy and Laura DeNardis
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Information Technology in Theory 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 made
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Information Technology in Theory 3 Objectives (Continued) 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 technologies
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Information Technology in Theory 4 Imaging Technologies Traditional Camera Invented more than a century ago Captures images with a few simple components: Lens Shutter system Photographic medium such as film 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. The film is then developed and printed on photographic paper.
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Information Technology in Theory 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 (short for picture elements), each containing a single unit of color information. A pixelized image is similar to a mosaic
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Information Technology in Theory 6 Mosaic Image
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Information Technology in Theory 7 Pixelized Images
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Information Technology in Theory 8 A Bitmap Image
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Information Technology in Theory 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 and resolution. Useful for representing geometric shapes but not effective for photographs.
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Information Technology in Theory 10 Capturing Color Images Using Digital Cameras Lens system Sensor array Filter system Memory Processor Software Viewing screen
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Information Technology in Theory 11 Capturing Color Images Using Digital Cameras Lens system is used to focus the image onto a small sensor array called a CCD (charge-coupled device) array. These sensors detect light and produce electricity proportional to the intensity of that light.
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Information Technology in Theory 12 The CCD Array
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Information Technology in Theory 13 The Additive Color Model
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Information Technology in Theory 14 The Additive Color Model
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Information Technology in Theory 15 Spinning Disk Filter
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Information Technology in Theory 16 Image Resolved Into Basic Color Components
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17 Color Palette and Corresponding Binary Codes
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This note was uploaded on 01/26/2012 for the course IT 108, 103, taught by Professor Bruno during the Spring '11 term at George Mason.

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Chapter 7 - Information Technology in Theory By Pelin Aksoy...

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