How to find the leftmost and rightmost white pixel in a binary image in Matlab ?

I have a binary image in which there is only one nonzero region.How I find the leftmost and rightmost white pixel and then connect them by a line.

Answer 1

[Image Analyst]

Lots of ways. For example call bwconvhull() and then regionprops to get bounding box.

binaryImage = bwconvhull(binaryImage, 'union');
props = regionprops(binaryImage, 'BoundingBox');
leftColumn = props.BoundingBox(1);
topRow = props.BoundingBox(2);

Or simply use find()

[rows, columns] = find(binaryImage);
leftColumn = min(columns);
topRow = min(rows);