Finding Distance Between Lines

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Cy
Cy il 21 Gen 2015
Modificato: Cy il 22 Gen 2015
Hi All, I am trying to learn how to process images in Matlab. I am trying to find the horizontal/vertical distance from the outer edge of the major gridline to other outer edge of the major gridline. The major gridlines are spaced 1" apart. I have attached some graph paper for visualization. I have a few questions as to how to start the process. Do I need to convert the image to binary in order to find the edges? How would I determine the exact edge of the gridline? How can I get the count of the pixels between these two edges?
Any guidance would be greatly appreciated to get me started in the right direction.
Thanks!
Added a PNG file.

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Image Analyst
Image Analyst il 21 Gen 2015
Get profiles and look at full width at half max
verticalProfile = sum(grayImage, 2);
horizontalProfile = sum(grayImage, 1);
subplot(2,1,1);
plot(verticalProfile);
subplot(2,1,2);
plot(horizontalProfile);
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Image Analyst
Image Analyst il 22 Gen 2015
Modificato: Image Analyst il 22 Gen 2015
I'll look at it later this morning. In the meantime, do you have a PNG, BMP, or TIFF file? JPG files are not good for image analysis because of the jpeg artifacts like block artifacts and blurring. It's easier to go from center to center - you can use findpeaks() in the Signal Processing Toolbox. Is that okay? Do you have that toolbox?
Cy
Cy il 22 Gen 2015
Modificato: Cy il 22 Gen 2015
Yes, I have access to the Signal Processing Toolbox. From the findpeaks() functions, do I just need to find the maximum values from peak to peak in order to find the distance?

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sukuchha shrestha
sukuchha shrestha il 22 Gen 2015
use thresholding to get major grid lines run with horizontal line structuring element to get vertical major grids ( imgV) run with vertical line structuring element to get horizonal major grids(imgH) label imgV and get minX, minY for every blobs compute distance ( x-x)2+(y-y)2

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