Digital Image Processing

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Digital Image Processing

  1. 1. Digital Image Processing
  2. 2. What are Images ? <ul><li>Images are pictures! </li></ul><ul><ul><li>A picture that represents visual information. </li></ul></ul><ul><li>How are non-digital images stored? </li></ul><ul><ul><li>Photographic film </li></ul></ul><ul><ul><li>Canvas/paint </li></ul></ul><ul><ul><li>Digitally </li></ul></ul>
  3. 3. What are Digital Images? <ul><li>Images stored in digital form! </li></ul><ul><li>Many ways of acquiring images </li></ul><ul><ul><li>Scanner </li></ul></ul><ul><ul><li>Digital Camera </li></ul></ul><ul><ul><li>Others… </li></ul></ul><ul><li>Many ways of storing images </li></ul><ul><ul><li>Gif </li></ul></ul><ul><ul><li>Tiff </li></ul></ul><ul><ul><li>BMP </li></ul></ul><ul><ul><li>JPG </li></ul></ul><ul><ul><li>Others… </li></ul></ul>
  4. 4. What is Digital Image Processing ? <ul><li>Definition One: &quot;The processing of one picture, by computer, to produce another” </li></ul><ul><li>Examples: </li></ul><ul><ul><li>Improving the contrast of a picture to make it easier for a human to interpret </li></ul></ul><ul><ul><li>Applying noise-reduction filters to make the image clearer </li></ul></ul>
  5. 5. What is Digital Image Processing ? <ul><li>Definition Two: &quot; The facilitation or automation of visual tasks using computers” </li></ul><ul><li>Examples: </li></ul><ul><ul><li>Automatic recognition of objects within a picture </li></ul></ul><ul><ul><li>Determining a persons identity by examining an image of their fingerprint </li></ul></ul>
  6. 6. What are the Benefits of Digital Images? <ul><li>Images have better quality since they don’t degrade during processing </li></ul><ul><li>Can be transmitted over digital communication lines </li></ul><ul><li>Can be easily manipulated and processed using common hardware/software packages </li></ul>
  7. 7. Image Processing Pipeline Acquisition : creation of digital image Processing : enhancement or other processing Archival : storage of image Transmission : exchange of digital image data Display : visualization of digital image
  8. 8. Topics of Study Processing Stage Topic of Study Acquisition Physics of light Human perception Mathematical color models Processing Software architecture Data representation Algorithm design Archival Compression techniques Data representation Transmission Network protocols Display Digital halftoning Color models Human perception
  9. 9. What Applications use Digital Image Processing? <ul><li>Satellite imaging </li></ul><ul><ul><ul><li>Spy satellites </li></ul></ul></ul><ul><ul><ul><li>Weather satellites </li></ul></ul></ul><ul><ul><ul><li>Exploratory satellites (Gallileo, Mars Explorer) </li></ul></ul></ul><ul><li>Graphic design and artwork </li></ul><ul><li>Medical imaging </li></ul><ul><ul><ul><li>MRI </li></ul></ul></ul><ul><ul><ul><li>CT </li></ul></ul></ul><ul><li>Military target acquisition </li></ul><ul><ul><ul><li>Smart Bombs </li></ul></ul></ul><ul><ul><ul><li>Apache Helicopters </li></ul></ul></ul><ul><li>Sports Broadcasting </li></ul><ul><li>Data visualisation </li></ul><ul><li>Postal Mail Delivery </li></ul>Source: www.nasa.gov

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