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Details for G Ratio Calculator
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NameG Ratio Calculator
Description
G Ratio Calculator allows you to calculate the G ratio in the following way:
gratio.jpg 
Image processing

The two first steps (“Prepare image” and “Start measurements”) involve several filters and processing procedures. Then the actual measurement occurs.

Prepare Image
• Convert the image to 8-bit: we do not need color information.
• Apply a median filter: removes noise and allows better edge detection.
• Apply a user-defined threshold: we need to binarize the image.

Start measurements
• Apply an “Open” binary operation on the image: removes residual gaps between “attached” fibers.
• Listen the image for cursor location

Measure
• Auto-outline the inner part of the fiber
• Measure inner area and inner perimeter (a1 and p1)
• Find the border
• Auto-outline the outer part of the fiber
• Measure total area and outer perimeter (a2 and p2)

- Methods used for G factor calculation:

Two values are computed:

pgfactor, which is the perimeter-based g factor, is calculated this way:

pgfactor =  pratio.jpg

agfactor, which is the area-based g factor, is calculated this way:

agfactor =  aratio.jpg

pgfactor and agfactor are totally equal for an ideal round fiber. The more the fiber is distorted, the more these values will differ. If you should use only one of these values, the agfactor should be chosen because it is shape independent.

 

FilenameG Ratio Calculator.zip
Filesize1.5 MB
Filetypezip (Mime Type: application/zip)
Creatorykrempp
Created On: 10/30/2008 10:13
ViewersEverybody
Maintained byEditor
Hits1815 Hits
Last updated on 10/30/2008 10:28
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