Equation to measure meters from pictures

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Abdussalam Elhanashi
Abdussalam Elhanashi on 21 Dec 2020
Answered: Image Analyst on 24 Dec 2020
Hi,
I am measuring the distance between the centroid of bounding boxes for detected objects in pixels in the images .I am looking for an equation which convert the measurment in pixels into meters .
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Matt Gaidica
Matt Gaidica on 21 Dec 2020
You're going to need a reference in your frame—do you have that? (e.g., a ruler) Once you have that, you have some ratio of pixels/meters, and you divide your object pixel distances by that to get your answer.

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Answers (2)

Rishabh Mishra
Rishabh Mishra on 24 Dec 2020
Hi,
To find distance between 2 points, you require their co-ordinates. Assuming co-ordinates for 2 points are stored in arrays x & y respectively. The distance ‘D’ between these 2 points is given by,
x= [1 2 3];
y= [3 4 5];
D = norm(x-y);
The distance value so obtained has units as pixels. Convert pixels into meters using the conversion value given below:
1 pixel = 0.0002645833 m
Hope this helps.

Image Analyst
Image Analyst on 24 Dec 2020
See my spatial calibration demo. It will show you how you can get the meters per pixel, or whatever real world units you're using.

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