Obtaining the pixel values within an ROI

Question

Meghana Balasubramanian 2020-1-17

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https://ww2.mathworks.cn/matlabcentral/answers/500693-obtaining-the-pixel-values-within-an-roi

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 advance

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Answer 1

KSSV 2020-1-17

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https://ww2.mathworks.cn/matlabcentral/answers/500693-obtaining-the-pixel-values-within-an-roi#answer_410551

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.