how to calculate the area of an object?

I have a set of images: 5 images, I calculated the suface of these images and then I saved them in a matrix and I have another set of images that contains 5 images, I calucled in another scipt their areas and I saved them in a matrix.

here are the surface values of each group of images :

but the problem when I calul the area of 2 groups of images in a single script, the values will be unorganized, here is:

that is, I want the values of the images to remain like this:

  107, 410, 281, 200, 266, 20, 25, 13, 23, 16

[marwa za]

@ Image Analyst please can you help me

[Rik]

This depends on the order of your files. Also, why do you repeat the dir call every iteration?

[marwa za]

the order of the images in my folder are correct and I repeated the call for to read all the images in my folder

[Rik]

The order inside your array is determined by the order that is returned by the dir function. If you don't want to sort them based on your own criteria, then you're stuck with this order.

Also, there still is no reason whatsoever to keep your dir call inside your loop.

[marwa za]

ok thanks and how can I correct it so that it reads the images according to my order

[Rik]

What are your file names and what order do you want them?

[Rik]

It is no use sending me an email without any answers to my question for clarification. Just answer the question and I (or other) will probably be able to help.

[marwa za]

the name of my file is calcul and I want the order of the values of the images associated with the order of the images that I made in the file (1,2,3, ...)

[Rik]

You have a list of 10 files. What are their exact names and in what order do you want to have their results in the output array?

[marwa za]

Their names are P1, P2, P3 ... P10 and I want the values of their area remain in the following order: 107, 410, 281, 200, 266, 20, 25, 13, 23, 16

Answer 1

[Image Analyst]

You shouldn't calculate areas based on the grayscale image. You must segment it first into foreground and background areas and pass in the binary image to regionprops(). See my Image Segmentation Tutorial: in my File Exchange

[marwa za]

I have already done the segmentation of my images then I have to calculate the area of my region of interest

[Image Analyst]

Then it should work. Attach your new code if it doesn't. Should look something like

props = regionprops(binaryImage, 'Area')
allAreas = [props.Area]

[marwa za]

I have already calculated the area, the problem is in the matrix, that what I have to correct for the values of surfaces remain correct please

[Image Analyst]

Save each areas matrix to a mat file, then read in all the mat files and stitch them together

s1 = load(filename1);
areas1 = s1.areas
s2 = load(filename1);
areas2 = s2.areas
allAreas = [areas1, areas2]

[marwa za]

ok thanks