update maplab example

update maplab example

Author: taigw

crf_max_flow_matlab/10.png

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+# Matlab wrap of maxflow for 2D image segmentation
+This package is a Matlab wrap of maxflow algorithm written in cpp.
+
+To build, run the `make.m` file. 
+
+See `test1.m` and 'test2.m' for examples of using this package. 
+
+![crf_2d_matlab](../data/crf_2d_matlab.png)
+

crf_max_flow_matlab/10prob.png

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+I = imread('../data/img2d.png');
+if (length(size(I)) == 3)
+	I = I(:,:,1);
+end
+P = imread('../data/prob2d.png');
+
+fP = double(P)/255.0;
+bP = 1.0-fP;
+
+lambda = 10.0;
+sigma  = 5.0;
+[flow, lab] = automaxflowmex(I, fP, bP, lambda, sigma);
+lab = (1-lab)*255;
+subplot(1,3,1); imshow(I); title("input image");
+subplot(1,3,2); imshow(P); title('probability map');
+subplot(1,3,3); imshow(lab); title('CRF result');

crf_max_flow_matlab/README.md

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+I = imread('../data/img2d.png');
+if (length(size(I)) == 3)
+	I = I(:,:,1);
+end
+P = imread('../data/prob2d.png');
+
+fP = double(P)/255.0;
+bP = 1.0-fP;
+
+seed = uint8(zeros(size(fP)));
+seed1_x = 28
+seed1_y = 33
+seed2_x = 41
+seed2_y = 53
+    
+seed(seed1_y - 2 : seed1_y + 2, seed1_x - 2 : seed1_x + 2) = 255;
+seed(seed2_y - 2 : seed2_y + 2, seed2_x - 2 : seed2_x + 2) = 127;
+lambda = 10.0;
+sigma  = 5.0;
+[flow, lab] = interactivemaxflowmex(I, fP, bP, seed, lambda, sigma);
+lab = (1-lab)*255;
+subplot(1,3,1); imshow(I); title("input image");
+subplot(1,3,2); imshow(P); title('probability map');
+subplot(1,3,3); imshow(lab); title('CRF result');