how to get the actual distance between two points

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Soumya Behera
Soumya Behera 2015-12-17
评论： Image Analyst 2015-12-17
I have a rectangular arena ,the length and breadth of the rectangle is known in units of centimeters ,I have an image(521*441) of the arena .How can we calculate the distance between any two points in the arena if I know the coordinates of the points in the image??

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Image Analyst
Image Analyst 2015-12-17
See my attached spatial calibration demo to let you designate two points and say what the real world distance is. Then measurements you make will be reported in those, for example meters.
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Soumya Behera
Soumya Behera 2015-12-17
Thanks A lot sir .Sir please look into the problem I just mentioned in the above comment .
Image Analyst
Image Analyst 2015-12-17
See my Image Segmentation Tutorial: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862
It will show you how to find the centroids. After that, you can order them in whatever order or pattern you want.

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Renato Agurto
Renato Agurto 2015-12-17
This should do the job:
length_cm = 30;
width_cm = 20;
length_px = 521;
width_px = 441;
length_cm_pro_px = length_cm/length_px;
width_cm_pro_px = width_cm/width_px;
% point1: (x1, y1)
% point2: (x2, y2)
dx = x2-x1;
dy = y2-y1;
distance_in_cm = sqrt((dx*length_cm_pro_px)^2 + (dy*width_cm_pro_px)^2);
cheers!
Renato
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Renato Agurto
Renato Agurto 2015-12-17
Hi. I'm not sure if the answer helped you or not. If your are asking a new question you should create a new topic
Soumya Behera
Soumya Behera 2015-12-17
Yes sir your answer too helped me .Thanks a lot for that .I will create it sir but for the time being can you please help me solving it??.Thankyou

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