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How to find sum of all pixel value of ROI in a grayscale image?

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Shashi TG
Shashi TG 2016-7-4
评论： Image Analyst 2018-3-22
I am trying to draw a ROI of a grayscale image using imfreehand. After drawing this, I want to count all the intensity levels contained in this ROI. How can I do this?

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Walter Roberson
Walter Roberson 2016-7-4
http://www.mathworks.com/help/images/create-binary-mask-using-an-roi-object.html
Use the createMask method of the imfreehand object to create a binary mask. Suppose we call that mask . Then,
selected_values = YourImage(mask);
sum_of_selected = sum(selected_values);
count_intensity_values = length( unique(selected_values) );
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Image Analyst
Image Analyst 2016-7-4
See attached demo to freehand mask an image and find the drawn region's mean and centroid.
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Fahad Alharbi
Fahad Alharbi 2018-3-22
can I apply this demo on a folder of images insisted of one by one ? thanks again.

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