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Digital Image Blooming


 
  • Each pixel of the CCD camera (digital camera) is capable of imaging a fixed amount of light (photons).
  • When the amount of light exceeds the pixel's capacity, the pixel becomes saturated.
  • This excess light overflows (smears) to the surrounding pixels and blooming occurs.
  • PROPERLY EXPOSED IMAGE


  • EXCESS LIGHT OVERFLOWS AND BLOOMING OCCURS


  • Reflective Retinal Pathology that might cause Blooming:
    • Optic Nerve
    • Laser Scar
    • Exudates
    • Drusen
    • Large Vessels
    • Leakage on Angiography
  • EXAMPLES


  • EXAMPLES


  • Image blooming can cause loss of diagnostic information.
  • Once image blooming occurs you can’t recover or “burn in” the overexposed area as with film.
  • HINTS:
    • Decreasing flash and/or gain on the camera will lessen the amount of blooming.
    • Anticipate and compensate for potential blooming.
    • Slightly underexposing an image can help to avoid blooming.
    • Bracketing images might be needed.
    • Sometimes blooming can't be avoided.

 
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