Extracting part of an image

Hi, I am trying to extract a part of an image to get average pixel intensity of that part.

Attached image '1.jpg' is the original image and '1.. line.jpg' shows the part that I want to extract.

I cannot use the imcrop command since the part I want is not rectangular.

I tried using the drawpolygon command and got the vertices of the polygon, but I couldn't take it any further.

Can anybody help me?

Thank you in advance.

Answer 1

[Matt J]

Use impoly instead of drawpolygon. Use the createMask() method of the impoly object h to extract the ROI pixels

pixelvalues = yourImage(h.creatMask)