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Image Enhancement of Polycrystalline Aluminum Electron Diffraction Patterns

Image Enhancement of Polycrystalline Aluminum Electron Diffraction Patterns. ECE 533 Fall Semester 2003 Final Project Paul Larsen William Stratton. Outline. Background: Electron diffraction patterns Experimental procedure Results Conclusions. Background: Electron Diffraction Patterns.

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Image Enhancement of Polycrystalline Aluminum Electron Diffraction Patterns

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  1. Image Enhancement of Polycrystalline AluminumElectron Diffraction Patterns ECE 533 Fall Semester 2003 Final Project Paul Larsen William Stratton

  2. Outline • Background: Electron diffraction patterns • Experimental procedure • Results • Conclusions

  3. Background: Electron Diffraction Patterns • Tremendous amount of data present • Atomic Structure • Composition • Material Constants Simplified ray diagram of a typical TEM. The specimen would be placed above lens 1. Diffraction patterns of specimens are viewed at the back focal plane. Diffraction patterns of an A1 single crystal, polycrystalline gold, and amorphous carbon respectively. Williams, D., Carter, CB, Transmission electron microscopy, Plenum Press, NY, 1996

  4. Experimental Procedure Step 1. Obtain diffraction pattern images of polycrystalline Aluminum for several Shift Level/Exposure Time combinations: Exposure Time

  5. Step 2: Apply image enhancement techniques to all images: Log transformation: Power-law transform: Histogram equalization: Median filter Step 3: Visually inspect to determine which transformations extract the most data from the patterns while also minimizing the noise Experimental Procedure

  6. Results: The Best Transformations for Each Shift Level/Exposure Time Combo. Exposure Time

  7. Sample Results

  8. Sample Results

  9. Conclusions • Image Enhancement very beneficial for electron diffraction images • Best results obtained using power law and log transformations combined with median filter • For power-law transform, increase γ as shift level increases or as exposure time decreases

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