measure density in ribbon-like structure

Posted by Edgar Rivedal on Jun 28, 2011; 6:48am
URL: http://imagej.273.s1.nabble.com/measure-density-in-ribbon-like-structure-tp3684110.html

Dear all
In a grey-tone image I want to draw a freehand circlular line. Then I want ImageJ to create two lines, one on the inside and one on the outside of the first line, both having the same distance from the first line. The two last lines would then create a ribbon of fixed width with the same form as the first line. Then I would like to measure integrated grey-tone density in the area (ribbon) made up by the two last lines, as well as the integrated density inside of the ribbon.

Best regards
Edgar