cropping image based on markers

I have an aerial image that i need to crop at certain markers in the image. is it possible to crop the image between the markers in code without manually cropping the image. I have attached an example image below.TIA

[Matt J]

Do you already have code that finds the markers? How is the crop box defined, seeing as the markers can form an arbitrary quadrilateral?

[laurent jalabert]

Define a Region of Interest (ROI) maybe ?

[DGM]

Today I learned that there's a size limit on attached images, but apparently not on inline images.

I was going to ask a question about the problem, but I forgot what it was sometime while waiting for the editor to open for the last ten minutes.

Answer 1

[Image Analyst]

Get the mask of the white pixels then use find() and min() and max() and indexing.

[r,g,b] = imsplit(rgbImage);
whiteMask = r == 255 & g == 255 & b == 255;
[r, c] = find(whiteMask);
row1 = min(r)
row2 = max(r)
col1 = min(c)
col2 = max(c)
croppedImage = rgbImage(row1 : row2, col1 : col2, :);

[thomas chalmers]

Thank you so much

[Image Analyst]

If it worked, could you click the "Accept this Answer" link. Otherwise let me know it didn't work and I'll fix it.