Trace Image from Intensity

I have the following image and want to plot a line that follows the outline of the image based on the intensity. I considered using "bwtraceboundary" but I I want to be able to set the region in which it traces. For example, if the pixel is greater than 25% of the max pixel in that row, I want to save that point. After the code has spanned over all rows, all of the saved points will be a trace of the high intensity region of the image.

[Articat]

I tried this:

flamefront = [];

for c = 1:size(mean_max_upper)

r = 1;

indicator = 0;

while indicator == 0;

if mean_max_upper(r,c) >= .25*max(mean_max_upper(r,c));

indicator = 1;

flamefront = [flamefront; r,c];

end

r = r+1;

end

end

where mean_max_upper is the image and flamefront is the array I would like to fill. However it's just running from 1 to the amount of rows and not saving anything.

Answer 1

[Image Analyst]

Try

mask = grayImage > someThreshold
boundaries = bwboundaries(mask)

[Articat]

Thanks!