Obtaining the pixel values within an ROI

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Meghana Balasubramanian
评论： Meghana Balasubramanian 2020-1-20
Hello,
I have an image where the object of interest is curved and I would like to linearize it. To do that, I thought I could read the pixel values between the region created by (x1, y1), (x2, y2) and (a1, b1), (a2, b2) and reposition them in a linear manner. Assume that the x & y coordinates refer to the red line and a & b refer to the yellow. The ROI is the area in white.
I am not aware of how I could go about this.
Thank you, in advanceimage2.jpg

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KSSV
KSSV 2020-1-17
As you have the coordinates for the boundary, use inpolygon and get the locations of the points lying inside the clsoed region......with these indices, you can get your pixel values. Read about inpolygon.
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Meghana Balasubramanian
Meghana Balasubramanian 2020-1-20
I'm not able to use inpolygon for an image. It doesn't seem to identify the pixels as points.

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