How to make label on the image and find the distance?

Hello,

I have one image and i want to put label on it for finding the distace.

anyone suggest or give code to make label on that region which shown in fig. and also want to plot line between two black line in that box.

alos i attched my file to look at my code.

Answer 1

[Image Analyst]

I don't know how a label would help you "for finding the distace". But anyway, to put a text label on the image use the text() function. To put a rectangle on the image use the rectangle() function. To plot over the image, use the plot() function.

When you say "finding distance between two black line" I don't know what that means. There are lots of distances between lots of points on two black lines, like your horizontal line and your vertical line. What distance are you talking about?

[Prashant]

Hi Image Analyst,

Actually, i have already asked one question in this link, you can find this qustion.

https://de.mathworks.com/matlabcentral/answers/555463-how-to-fitline-on-my-binary-image-and-find-distance#comment_961411 please review this question, you will understand and the question is about camera calibration.

I have seen one example in matlab about measuring planar object with camera calibration method. in that method they measure coin size with labeling image, so i was thinking the same in my case. If you know that solution, i need your help. would be really appreciate.

[Prashant]

Hi Image analyst

I have checkerboard and i want to find number of pixel in one square block. I know the size of this block is

34 x 34 mm and now i want to see that in that one square block how many pixelis there?

I have written this code, but with this code i can find center to center distance not corner to corner. how can i find this?

the code is below:

fontSize = 13;
numImages = 20;
files = cell(1, numImages);
for i = 1:numImages
    files{i} = fullfile('S:\EE_Elektrik_Elektronik\Licht_Sicht_Stud\1000_Studenten\Khandelwal\Masterarbeit\MATLAB\Image_processing\Calibration\10m\10m\Image_neue', sprintf('IMG_%d.JPG', i));
end

% Display one of the calibration images
magnification = 20;
I = imread(files{1});
imshow(I) % a1=original image (unprocessed)
a1G=mat2gray(I); 
a1GCT=graythresh(a1G); 
a1B=im2bw(a1G,a1GCT); 
a1C=imcrop(a1B); 
a1RP=regionprops(a1C,'Centroid','MajorAxisLength',...
    'MinorAxisLength','Orientation', 'Eccentricity'); 
CentroidS=cat(1,a1RP.Centroid); 
x = CentroidS(:,1);
y = CentroidS(:,2);
figure 
imshow(a1C)
hold on 
plot(x,y,'b*')
w = msgbox('Pick 2 points');
waitfor(w)

while 1
    xy = ginput(2);             % get coordinates of mouse clicks
        % find 2 closes points
    [~,ind] = pdist2([x y],xy,'euclidean','Smallest',1);
    x1 = x(ind);
    y1 = y(ind);
    plot(x1,y1,'o-r')           % plot closes points
    d = pdist([x1 y1]);         % distance between points
    t = text(mean(x1),mean(y1),num2str(d));
    set(t,'Color','Yellow','BackgroundColor','Black');
    w = waitforbuttonpress;     % mouse click - conntinue, button - quit
    disp('press anything to quit')
    if w                        % if button was pressed - quit
        break
    end
end

[Image Analyst]

See my answer in your duplicate question: Click Here for the Answer