matlab programming help

[intan]

in the doc, i hv a picture with edge detecting. i wan to knw hw to get the area of the person? its equal to the number of the pixel rite? really appreciate ur help. thanks

 

[ehsanica]

the number of the pixel inside the edges is only an approximate value of the area.
you may take the "scale" issue in count. if you change the camera view of distance to the person, then the area will differ.
On the other hand, when you change the size of the picture (zoom or shrink or change in resolution) the number of pixels will change.

 

[pk_volt]

You can try using connected component labelling - bwlabel() to find all the unique objects in the image.

Then use regionprops() to find the area of the object of interest.