Plotting co-ordinates using image processing.
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Hello all! I would like to plot the real worl co-ordinates in matlab and plot a triangle. I have marked the point with a red marker and detected its location. But the value returned is in pixel and hence to convert it inot cm, I multiplied the x and y co-ords of the image by 0.02..still I'm not getting the correct answer. It should be 0.6 whereas the calculated value is 4. Please help me over this.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/163685/image.png)
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Image Analyst
am 7 Jun. 2014
Take a picture of something like a ruler and then you calibrate how many pixels equals 1 cm.
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