Plotting or choosing nth pixel in a binary image

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Elf 2017-4-17

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评论： Image Analyst 2017-4-19

Hi

I have a binary image and I found the positions of the ones. I have x and y positions. I plotted from variables tables for example plot(1,94, 'g+'). I have selected every 60th pixel. I wonder is it possible to have a command or code to choose every nth pixel by itself instead of writing manually?

Thanks

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Answer 1

Image Analyst 2017-4-17

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Yes, though I don't know why you'd want to do this

[y, x] = find(binaryImage);
hold on;
plot(x(1:60:end), y(1:60:end), 'g+', 'MarkerSize', 8, 'LineWidth', 1);
grid on;

Adapt as needed to suit your tastes.

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Elf 2017-4-19

Thanks a lot. I have a line in my binary image I am trying to get 10 points from this line. I want to get 10 out of all line. I tried your code and I got one result and it is not on the line. I dont know maybe it is not possible to do without manuelly.

Image Analyst 2017-4-19

Show your image. Is the line a row in your image? Or a column? Or a white blob at some arbitrary angle? Is the line longer than 10 pixels? If so, which do you want - the first 10 pixels, the last 10 pixels, the middle 10 pixels. Have you read this link?

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