Hi
I am trying to count grains using images within ZEN. Here I report a weird behavior of the separation using digital number (DN) values.
As you can see in the attached pictures the algorithm is not able to pick and separate the grains using the given DN interval.
In the first image the interval is 10-20 while in the second image the interval is 10-21. As it can be noted this simple change includes DN values far larger than those chosen via the dialog.
Weird behavior for DN class separation in ZEN Image analysis module
Weird behavior for DN class separation in ZEN Image analysis module
- Attachments
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- 10-20.jpg (18.22 KiB) Viewed 5918 times
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- 10-21.jpg (18.58 KiB) Viewed 5918 times
Hello Ciprian,
it is not so easy to reply to your post, as the two screenshots supplied have a very low resolution.
However, the main point seems to be the low dynamic of the image. The histogram just shows a function in the area of low values, which means that the image has lower than 50% of the dynamic range possible.
Therefore a slight change of Threshold can have a relatively strong impact on the Separation, Segmentation etc.
Maybe it is also a good idea to set smoothing and sharpen to 'None' when doing the first general steps.
By the way there is a module 'grains' that works according to the standards given.
it is not so easy to reply to your post, as the two screenshots supplied have a very low resolution.
However, the main point seems to be the low dynamic of the image. The histogram just shows a function in the area of low values, which means that the image has lower than 50% of the dynamic range possible.
Therefore a slight change of Threshold can have a relatively strong impact on the Separation, Segmentation etc.
Maybe it is also a good idea to set smoothing and sharpen to 'None' when doing the first general steps.
By the way there is a module 'grains' that works according to the standards given.
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- Posts: 23
- Joined: Tue Jun 20, 2023 10:20 pm
Re: Weird behavior for DN class separation in ZEN Image analysis module
Weird behavior in ZEN's Image Analysis module concerning DN (Digital Number) class separation might be due to incorrect thresholding settings or improper handling of pixel intensity values during the separation process. Double-check the settings and consider adjusting them to ensure accurate class separation.
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