How can I extract a mammogram image's tumor area after drawing it with using roipoly command ?

I use roipoly command to draw sides of tumor suspicious area. And after drawing I want to extract that region from original image.

Using which matlab command I can extract this area from original image?

and my second question if it is possible how will I increase whiteness of tumor suspicious area in that region?

I can increase sharpness with fspecial and roifilt2 command in that region but I need to increase whiteness.

(The image is taken from mias database)

Answer 1

[Cris LaPierre]

See this answer: https://www.mathworks.com/matlabcentral/answers/512971-finding-area-of-polygon-defined-by-roipoly

[Ali Zulfikaroglu]

It doesn^t help actually. according to answer ı should find coordinates of this polygon and its not only a specific points, every dot has mant points so it is time loss.

[Cris LaPierre]

Perhaps I misunderstood. This post was about how to get the area of a shape drawn with roipoly.

What is the result you are looking for?

[Cris LaPierre]

Ali's reply moved here.

"I draw a polygon which include tumor suspicious region. I need that polygon's extraction from original image .

Is there any matlab command to extract that region which I draw?"

[Cris LaPierre]

I think what you are asking for is how to apply a mask to an image.

Perhaps this page is helpful: Create a Binary Mask