What is exact meaning of the perimeter?

I trouble about the particle information.
In my application, After processed the blob, and
I reported area and perimeter each indexed particle.
but In the first image, the area is 6, and the perimeter is 8.
What happen?
Before I knew, the perimeter is bigger than the area
But the perimeter is bigger in case of small Particle,
(Image 1)
and the area is bigger in case of big particle.
(Image 4)
So, let me know about How can analyze the perimeter in detail.
I attached image files.
Attachments:
Inspection_Images.ppt ‏534 KB

Please look at a atteched image again.
In the image, you will see the information of the area, perimeter.
so, please check again about the perimeter analysis
Indeed, the perimeter calculations that you appear to be seeing are incorrect. The Particle Analysis perimeter algorithm uses sub-pixel interpolation to calculate the perimeter of the particles. When you have very small particles, or very square shapes, the perimeter calculations loose some of their accuracy. For example, I tested on a rectangle that was 97x80 pixels (actual area = 7760, actual perimeter = 354), and the algorithm returned a perimeter of 350, a much smaller percent error than what you are seeing.
With larger, more irregular objects, the perimeter calculation is mo
re accurate with the interpolation algorithms.
Hope this clarifies the behavior you are seeing.
Regards,
Colin C.
Applications Engineering
Colin Christofferson
Community Web Marketing
Blog

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Please look at a atteched image again.
In the image, you will see the information of the area, perimeter.
so, please check again about the perimeter analysis
Indeed, the perimeter calculations that you appear to be seeing are incorrect. The Particle Analysis perimeter algorithm uses sub-pixel interpolation to calculate the perimeter of the particles. When you have very small particles, or very square shapes, the perimeter calculations loose some of their accuracy. For example, I tested on a rectangle that was 97x80 pixels (actual area = 7760, actual perimeter = 354), and the algorithm returned a perimeter of 350, a much smaller percent error than what you are seeing.
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Hope this clarifies the behavior you are seeing.
Regards,
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Applications Engineering
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What is exact meaning of the perimeter?

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