Hi, I tried to solve your question,
I took the original image and then extracted shapes from it, took the star for reference map.
Now as of ur question shifted the map and tried to reposition it automatically and mapped it on the original star shape.
If this solves your question accept the answer or if you have any doubts let me know
Here is my Code:
%%Read the img..
img = imread('img.png');
img = double(rgb2gray(img));
figure, imshow(img,[]);
[BW num] = bwlabel(img);
for i = 1: num
objseparate(:,:,i) = BW == i;
end
%%Get the labels..
figure,
subplot(221), imshow(objseparate(:,:,1),[]),title('LABEL1');
subplot(222), imshow(objseparate(:,:,2),[]),title('LABEL2');
subplot(223), imshow(objseparate(:,:,3),[]),title('LABEL3');
subplot(224), imshow(objseparate(:,:,4),[]),title('LABEL4');
shape = cell(1,num);
%%mapping to get shapes
for i=1:num
shape{i} = objseparate(:,:,i) .* img;
end
figure,
subplot(221), imshow(shape{1},[]),title('BACKGROUND');
subplot(222), imshow(shape{2},[]),title('STAR');
subplot(223), imshow(shape{3},[]),title('TRIANGLE');
subplot(224), imshow(shape{4},[]),title('SQUARE');
%%Get the Boundary map imgs
se = strel('disk',2);
starMap = shape{2}-imerode(shape{2},se);
trinagleMap = shape{3}-imerode(shape{3},se);
squareMap = shape{4}-imerode(shape{4},se);
figure, imshow(starMap,[]);
%%lets try what you want here iam only doing star map u can try rest
% shift star by a bit to try and reposition it to map as ur requirement
% Orignal star
star = starMap;
K = bwlabel(star);
centK = regionprops(K,'Centroid');
xK = centK.Centroid(1);
yK = centK.Centroid(2);
% shift
T = maketform('affine', [1 0 0; 0 1 0; 50 100 1]); %# represents translation
shiftstar = imtransform(star, T, ...
'XData',[1 size(star,2)], 'YData',[1 size(star,1)]);
figure,
subplot(121), imshow(star,[]), title(' initial map');
subplot(122), imshow(shiftstar,[]), title('Your Shifted map');
L = bwlabel(shiftstar);
centL = regionprops(L,'Centroid');
xL = centL.Centroid(1);
yL = centL.Centroid(2);
x_diff = xK - xL;
y_diff = yK - yL;
% doing circshift to reposition
newImg = circshift(shiftstar,[round((y_diff)) round((x_diff)) ]);
figure, imshow(newImg, []);
% Mapping to see if its correct...
mapnewImg = newImg .*shape{2} ;
figure, imshow(mapnewImg,[]), title('Mapping: shape and shifted mapnewImg');
%%final check..
figure,
subplot(221), imshow(img,[]), title('original img');
subplot(222), imshow(shape{2},[]), title('Original star shape');
subplot(223), imshow(shiftstar,[]), title('Your Shifted starMap');
subplot(224), imshow(mapnewImg,[]), title('Mapping: shape and shifted mapnewImg');
% i hope this is what you want was fun trying it..
I am attaching the finalIMG for reference...
Good Luck...Let me know
