Measuring Line Profiles in IMages

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Vivek
Vivek 2025-9-11
编辑： Matt J 2025-9-29，22:48
I have a image such as below which has horizontal and vertical lines in the field of view. I want to segment the vertical line adjacent to the dark area such as in red below and vertical line in the intersection of the horizontal line(as seen in black).The full image has many such structiures. I want to stack all similar segmented structures within the fov (Average measuremnet of red and black) and display.I also want to measure the average x and y as shown below if the red line concaves at the max conving location in y.

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Matt J
Matt J 2025-9-11
Ran in:
I=im2double(im2gray(imread('image.png')));
BW=imbinarize(I);
D=bwareaopen(abs(gradient(I))>0.06,20);
D=imclose(D,strel('disk',5));
black=(median(BW,2)>0);
red=~black;
L=D.*red+2*D.*black;
imshow(labeloverlay(I,L,Colormap=[1,0,0;0,0,0]));
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Vivek
Vivek 2025-9-29，17:00
What I want is to crop an image such as the below with only features of the the same size . What I want to see is to overlay the shape of the left edges and right edges of the vertical lines next to datk regions and the place where horizontal line intersects v ertical line in black. IN the image below I would want to overlay only the three vertical segments in red and in black
Matt J
Matt J 2025-9-29，22:40
编辑：Matt J 2025-9-29，22:48
Please illustrate by drawing one rectangle (e.g. with drawrectangle) on the example segmented image above, demarcating one of the regions that we will want to overlay on other regions.
As part of the illustration, please also show us how the positions of the different edges of the rectangle are selected.

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