g_roi.m 1.27 KB
 Daniel Bourgault committed Jan 09, 2015 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 ``````function g_roi(imgFname); % G_ROI is a function to determine regions of interest in an image. % % This function allows the user to define a series of polygons % on an image in order to define regions of interest (roi) for % image stabilization. The result is a 2D matrix roi with 1s and 0s. % Just follow ths instructions. % % Input: imgFname: the image filename % Output: The 2D matrix roi written to filename roi.mat % % Author: Daniel Bourgault - 2011 % % im = imread(imgFname); imagesc(im); colormap(gray); hold on; [m n p] = size(im); roi(1:m,1:n) = 0.0; I = repmat([1:m]',1,n); J = repmat([1:n],m,1); answer='y'; while answer=='y' display(' '); input(' Position the image as you wish before defining a polygon. Press ENTER when ready.'); display(' '); display(' Make a polygon with the mouse. Press ENTER when done with this polygon.') display(' You will have the option to make more polygons when done with this one.') [px py] = ginput; px(end+1) = px(1); py(end+1) = py(1); plot(px,py,'r'); roiTmp = inpolygon(I,J,py,px); display(' '); answer = input(' Enter another polygon (y/n)? ','s'); roi = roi + roiTmp; end ij = find(roi > 1); roi(ij) = 1; figure(2); imagesc(roi); `````` Dany Dumont committed Apr 18, 2019 61 ``save([imgFname(1:end-4),'_roi.mat'],'roi','imgFname');``