Length & Width measurement of an image in Millimeters

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Vijay 2013-2-9

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https://ww2.mathworks.cn/matlabcentral/answers/62815-length-width-measurement-of-an-image-in-millimeters

评论： Matt J 2018-2-4

I am able to get the length and width of an image in pixels only.I am in need of measuring the length & width in millimeters for pixels/mm for a text extraction algorithm. how to get the values in millimeter?

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Matt J 2013-2-9

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https://ww2.mathworks.cn/matlabcentral/answers/62815-length-width-measurement-of-an-image-in-millimeters#answer_74371

You could measure, physically, the dimensions of a letter of text and then measure the same letter's dimensions in pixels in your image. Then you could deduce the size of your pixels in mm.

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Caroline David 2018-2-4

Is there a code for length measurements??

Matt J 2018-2-4

No, there is no code for length measurements.

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Vijay 2013-2-9

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https://ww2.mathworks.cn/matlabcentral/answers/62815-length-width-measurement-of-an-image-in-millimeters#answer_74372

Thats what i am not aware of how to measure the length & width in physical quantities.. all i get is in pixels only

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Vijay 2013-2-10

Thanks image analyst i got your demonstration on spatial calibration. ill make sure to answer people who are asking the same question again and again thanks a lot..