A problem in the loop
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Hi,
Please I want to draw a patch from four corner points of each building in the image. However, I do not know how can I create a loop for this purpose.
I posted my codes and I will highly appreciate any help may I get.
aa = imread('test_8bit_vis.tif');
figure, image(aa)
[x, y] = ginput
save My_Coordinates.mat x y
hold on
plot(x,y,'xw');
for ii = 1:length(x-1)
ind = x(1:4) + 4 * (ii-1);
patch(x(ind), y(ind),'yellow');
end
采纳的回答
Image Analyst
2015-4-19
See my code for doing it:
% Display something so we can draw on it.
folder = fileparts(which('office_4.jpg')); % Determine where demo folder is (works with all versions).
baseFileName = 'office_4.jpg';
% Get the full filename, with path prepended.
fullFileName = fullfile(folder, baseFileName);
% Check if file exists.
if ~exist(fullFileName, 'file')
% File doesn't exist -- didn't find it there. Check the search path for it.
fullFileNameOnSearchPath = baseFileName; % No path this time.
if ~exist(fullFileNameOnSearchPath, 'file')
% Still didn't find it. Alert user.
errorMessage = sprintf('Error: %s does not exist in the search path folders.', fullFileName);
uiwait(warndlg(errorMessage));
return;
end
end
rgbImage = imread(fullFileName);
imshow(rgbImage, []);
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);
% Give a name to the title bar.
set(gcf, 'Name', 'Demo by ImageAnalyst', 'NumberTitle', 'Off')
message = sprintf('Draw your polygon with left clicks.\nRight click the last point to finish it.');
uiwait(helpdlg(message));
loopCounter = 1;
while loopCounter < 30
% Let user draw the polygon.
[~, x, y] = roipolyold;
% Draw a yellow patch over the image.
patch(x, y,'yellow');
% Ask user if they want to continue.
promptMessage = sprintf('Do you want to Continue drawing patches,\nor Cancel to quit drawing?');
titleBarCaption = 'Continue?';
button = questdlg(promptMessage, titleBarCaption, 'Continue', 'Cancel', 'Continue');
if strcmpi(button, 'Cancel')
break;
end
loopCounter = loopCounter + 1;
end
It this meets the requirements, go ahead and please mark it Accepted.
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