snap to edge?

[Blackledge]

I am new to IMAGEJ and I have no programming skills. I want to take digital images and measure the distances between features in the image. Of course, you must first do a calibration with a known distance. With some commercial programs one can move the cursor just to the edge of one feature and click, then move the cursor to the edge of the other feature and click. The program then tells you the distance between the two points. However, a drawback is that the operator is doing this by eye. As a result, the precision on repeated measurements could be better. I know of at least one commercial software program that improves on this and gives you much better precision. If you have activated the "SNAP TO EDGE" feature of this program, when you have the cursor positioned near the edge and click, the software finds the pixel right at the edge of that feature and again does it when you move the cursor and click near the edge of the other feature. This greatly improves the precision on repeated measurements of the distance between features, and also makes the measurements much less dependent on operator skill.

So my question is: Does ImageJ have a feature equivalent to "SNAP TO EDGE"?

[kirill8910]

Hello!

I have no programming skills neither but recently I had a problem to find certain objects in the image and mark them with points. I guess this can help you if your edges in the images look unique to recognize them. Plugin can put mark on the edge and you can record a macro to connect them with a line and measure what you want.

This is topic for my problem:

http://imagej.1557.n6.nabble.com/Find-pattern-and-mark-it-with-point-td4620426.html

It was a plugin that I was suggested to.

Hope it can help somehow..

Kirill

26.03.2012, 19:06, "Blackledge" <[hidden email]>:
> I am new to IMAGEJ and I have no programming skills. I want to take digital images and measure the distances between features in the image. Of course, you must first do a calibration with a known distance. With some commercial programs one can move the cursor just to the edge of one feature and click, then move the cursor to the edge of the other feature and click. The program then tells you the distance between the two points. However, a drawback is that the operator is doing this by eye. As a result, the precision on repeated measurements could be better. I know of at least one commercial software program that improves on this and gives you much better precision. If you have activated the "SNAP TO EDGE" feature of this program, when you have the cursor positioned near the edge and click, the software finds the pixel right at the edge of that feature and again does it when you move the cursor and click near the edge of the other feature. This greatly improves the precision on repeated measurements of the distance between features, and also makes the measurements much less dependent on operator skill.
>
> So my question is: Does ImageJ have a feature equivalent to "SNAP TO EDGE"?