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Digital Imaging

Digital Imaging. Introduction. Digital Imaging is used every day in life. Has become less expensive and easier to use than film. Charged Couple Device (CCD). Filtering. Accomplished with a beam splitter One pixel assigned for each color. Bayer Filter Pattern.

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Digital Imaging

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  1. Digital Imaging

  2. Introduction • Digital Imaging is used every day in life. • Has become less expensive and easier to use than film.

  3. Charged Couple Device (CCD)

  4. Filtering • Accomplished with a beam splitter • One pixel assigned for each color

  5. Bayer Filter Pattern • Alternates rows of green and blue, and green and red pixels • Twice as many green as red and blue

  6. Color Space • Defines how colors are mixed together to form a specific color • Two types: RGB and CYMK

  7. Dynamic Range Good Dynamic Range Poor Dynamic range

  8. Interpolation Nearest Neighbor interpolation Bilinear interpolation Bicubic interpolation Fractal interpolation

  9. Resolution • The level of detail captured by a digital camera • Measured in Pixels • Limited in display to the level of the monitor. • Higher the resolution, the larger the image size that can be reproduced.

  10. Noise • Interference caused by electronics • Usually the quality of the sensors and camera determines noise level • Compression of files increases noise

  11. White Balance • Used to compensate for different lighting conditions • Fluorescent will normally cause a greenish hue • Halogen and mercury vapor will cause an orange-yellow hue • Normally automatically adjusted in the camera

  12. File Formats • Tagged Image File Format (TIFF) • Better compression format • Doesn’t lose data in compression • Requires adequate processor and memory • Joint Photographic Experts Group (JPEG) • Most commonly used format • Used mainly for natural photos • As compression increases, quality declines

  13. Storage • Variety of Types • Files Normally stored in JPEG format • Compact Flash, Smart Media, Memory Stick • Images are transferred to the computer for storage

  14. Digital Imaging Uses • Home Uses • Photography • Email • Photo editing • Business Uses • Publishing

  15. Hubble Space Telescope

  16. Medical Uses • Changing from analogue to digital • Allows Doctors to communicate information and get opinions of specialists thousands of miles away

  17. Government and Law Enforcement • Security Screenings • Biometrics • Prevent Fraud

  18. Other Uses • Archaeology • Cosmetic Surgeons • Beauticians

  19. Conclusion • How Digital Imaging Works • Terminology • File Formats and Storage • Uses of Digital Imaging

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