Development and Preliminary Application of Image Filters for Quantitative XCT Damage Analyses
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Transcript of Development and Preliminary Application of Image Filters for Quantitative XCT Damage Analyses
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Development and Preliminary Application of Image Filters for
Quantitative XCT Damage Analyses
Orlando, Florida, USA
March 10 - 14, 2003
12th Annual Research Symposium of the American Society for Nondestructive Testing
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Outline
• Abstract
• TIFF Binaries
• 3D Reconstructions
• Creating Image Filters
• Using AutoCAD layers as image filters
• Interpreting Data
• Summary
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Abstract
• Segmented binarized XCT images were analyzed using a method developed using a number of software applications to graphically interrogate the physical amount of ballistic meso-damage (>250 m) in impacted titanium alloy (Ti-6Al-4V) disk samples.
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TIFF image Binaries• A threshold is used to create the binary TIFF
images– These images are exported as a stack of binary 16
bit TIFF images!
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3D Reconstructions
• 16 Bit Tiff Images– ACTIS software puts these together and makes a 3D solid– Analysis of images using the ACTIS software produces
qualitative results
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• Using AutoCAD, a filter was developed– First:
• A cylinder is created within another cylinder with radius plus ¼ millimeter
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– Second• The smaller cylinder is subtracted from the larger one,
creating a ring
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– Third• The ¼ millimeter ring is subtracted from a
rectangular solid, creating a hollow rectangular solid
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– Finally• Hollow rectangular solids are created from subtracting
rings with three to twenty millimeter radii and each one becomes an individual layer within AutoCAD
Combined Layers
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TIFF Image is 70 X 70; it is aligned within the Tiff Image Bounding BoxLayer Bounding Box – 100mm X 100mm X 1mmTIFF Image Bounding Box – 70mm X 70mm
Using AutoCAD Layers as Image Filters
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TIFF Image Stays in Original Position
(0.334, 1.476)
• Layers move to a calculated offset.
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• TIFF image is placed on alignment lines which lie beneath the hollow rectangular solid
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• The current ring is zoomed in on
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• The Scene is Rendered, creating a ring with a ¼ millimeter radius.– This shows damaged and undamaged pixels– The rendered scene is then exported as a Bitmap
image
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• For all ¼ millimeter layers, this process is executed
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Using The Exported Images• The exported bitmap images created in
AutoCAD are multiple colors; the solids color is magenta, the damaged pixels are black, and the undamaged pixels are white
• AutoCAD averages the color of the pixels from the inner and outer radial ring causing more than three colors to be present in the export
• Exported images from AutoCAD are imported to Paint Shop Pro and reduced to three colors
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ImageJ and the Excel Standard Table• Using Image J, the three color images made
with Paint Shop Pro are analyzed and the number of pixels for each color are reported.
• An excel table calculates values for Axi-Symmetric Damage Fraction, Cumulative Damage, and Cumulative Unit Damage.
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Axi-Symmetric Damage Fraction• A measure of the percent damage in each
quarter millimeter ring out to the edge of the object. %d
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Axi-Symmetric Unit Damage Fraction
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Summary• The data from this work and work to come will
allow more accurate damage modeling to take place
• Predicting failure in materials is essential in improving the survivability and lethality of military units
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Current Goals
• Submit 2 Abstracts to NDIA conference ’24th International Symposium on Ballistics’– Abstracts Due - December 1, 2007– Paper Selection - January 15, 2008– Authors Notified - February 15, 2008– Papers Due - April 1, 2008– Final Program - June 1, 2008– Symposium - September 22-26, 2008
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Abstract 1
• Perspectives on the Requirements, Development, and Outputs of an X-Ray Computed Tomography Image Processing Application for Ballistic Impact Analysis In Armor Samples
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Abstract 2
• Advances in the Automated Analysis and Visualization of X-Ray Computed Tomography Image Data