MATLAB: How to convert Pixel to cm or inch (i want to know 1 pixel equal = ?? mm or = ?? cm = ?? inch)

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Sir, i want to know 1 pixel equal = ?? mm or = ?? cm = ?? inch

my Pixel Weld Area shown after area calculation is 23842 i getted from weld image region.

How i convert Pixel to cm or inch

There is any equation or formula to convert Pixel to cm or inch

Plz Help me.

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Hello , But how can i find the real length of dicom image if that is taken from a online data source. i can not use ruler to measure its mm size? Is there any way.

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MATLAB: How to calculate area in a binary image

Hi Asmalina,

1) To find the area in pixel size we just need to find the number of white pixel which would be

area = bwarea(bw);%bw is your binary threshold image

The unit would be pixel

2) To find the area in real world units , you need to find out how big one pixel is in appropraite units, if you working with DICOM image refer to this answer.

Another way is we can find the percentage of white area so if you have the plate area , you can find out the actual white area then.

to find out the percentage area:

percentageWhite = nnz(bw) / numel(bw);

MATLAB: Pixels to inch conversion

See my spatial calibration demo, attached. It lets you specify some known distance in the image and then make measurements based off of that.

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MATLAB: How to calculate area in a binary image

MATLAB: Pixels to inch conversion

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