Dear S. Alireza Mirhabibi ,

Look the link, maybe useful.

Article Real-time image processing algorithms for object and distanc...

https://www.pyimagesearch.com/2016/03/28/measuring-size-of-objects-in-an-image-with-opencv/

Regards,

Shafagat

Dear S. Alireza Mirhabibi ,

Look the link, maybe useful.

Article Real-time image processing algorithms for object and distanc...

https://www.pyimagesearch.com/2016/03/28/measuring-size-of-objects-in-an-image-with-opencv/

Regards,

Shafagat

Dear Professor Shafagat Mahmudova ,

Thank you so much to share this article.

Do you have a source code for this article? (my project is in python but I can use matlab code to re-write).

I think that if you could detect the object in the mage ( by using object detection algorithms SURF , SIFT or Brief ) so you can in the next step using a simple formula which is related to determine the distance between the edges for that object.

you can convert images data to binary type, and next use morphological algorithms in matlab.

Active contour (snake)

Firstly, detect the objects in binary image; in Matlab, you can use 'bwlabel'. After that, you can use region descriptors formula like 'Area of region'.

يوجد العديد من البرامج لمعالجة الصور أحد هذه البرامج imagejبرنامج ل

How to detect the object size

https://stats.stackexchange.com/questions/322798/how-to-detect-the-exact-size-of-an-object-in-an-image-using-machine-learning

A step by step approach for object detection algorithm

https://www.analyticsvidhya.com/blog/2018/10/a-step-by-step-introduction-to-the-basic-object-detection-algorithms-part-1/

If the object is one color degree you can get it from the histogram.

Convert the image into binary representation. If you have color image, convert the image into grayscale image and then convert it into binary image using thresholding method. Area of each object can be easily determined from the binary image. If you are using MATLAB, you may use 'regionprops' to know the area.

There is not single algorithm with the capacity to obtain the size. First, the object should be detected, Then, the object should be insolated. Finaly, the size of the object can be evaluated