How can I save a heterogeneous group of segmentation seeds drawn on an image via imfreehand?
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I want to specify various segmentation seeds across different MRI slices and save them.
I'm using imfreehand to specify these seeds.
After looking at the documentation, I've thought about using roicolor, so I would get various masks based on the colors that I get on imfreehand, as seeds on different spatial locations need to be considered equal if they share a color.
I'm not sure on how to go about this cause I don't know the numerical values of the colors specified on imfreehand (which are medium blue, light blue, light red, green, yellow, magenta, cyan, light gray, black).
Anyone knows how do I find out the numerical values of these colors?
Is the idea of using roicolor sensible for my needs?
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Image Analyst
le 27 Jan 2013
roicolor() is fine for getting a binary mask of a grayscale image between a lower and an upper gray level. The color used to draw with in imfreehand() has nothing to do with anything, other than what color you see your path drawn with. Don't worry about it. Just take the values of some region you draw and from those, determine some upper and lower gray levels and use those in roicolor(). Let me know if you need a demo for how to find intensity stats for the region you drew.
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Image Analyst
le 28 Jan 2013
Yes, but when you draw, with whatever color, you store the drawn coordinates in the cell array for that type of region. For example you're drawing brain (in the "brain" color, whatever that may be), and your user drew three paths. So you put the first path drawn into cell array caBrain{1}, and you put the coordinates of the second path that they draw into caBrain{2}, and so on. Now the user will draw liver. So you take the first path and store that in caLiver{1}, and store the second path coordinates in caLiver{2}, and so on - and we don't care what color you use to draw liver with. You can do that because you must know what type of tissue the user is drawing over, otherwise there's no telling what they drew over. Even your references know if their user is drawing over the subject/foreground or the background, so you can also. For example, you have two buttons "Draw Brain" and "Draw Liver" and they click one, and in the callback of "Draw Brain" you assign cells of caBrain with user-drawn paths, and when they click "Draw Liver" in the callback of "Draw Liver" you assign cells of caLiver with user-drawn paths.
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