how to get the actual distance between two points

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Soumya Behera 2015-12-17

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https://ww2.mathworks.cn/matlabcentral/answers/260736-how-to-get-the-actual-distance-between-two-points

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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Answer 1

Image Analyst 2015-12-17

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https://ww2.mathworks.cn/matlabcentral/answers/260736-how-to-get-the-actual-distance-between-two-points#answer_203569

spatial_calibration_demo.m

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 2015-12-17

Thanks A lot sir .Sir please look into the problem I just mentioned in the above comment .

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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Answer 2

Renato Agurto 2015-12-17

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在 MATLAB Online 中打开

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);