how to scan binary image and stop if value image=0?

Kshitij Singh answered . 2025-07-02 11:18:02

[x,y] = ginput(1);
row = round(y);
column = round(x);
thisColumn = binaryImage(:, column); % Extract this one column from the binary image.
while row >= 1 && thisColumn(row)
    row = row - 1;
end

When it's done, row will equal the row of the first 0 above the clicked point (which may be the clicked pint itself if you clicked on a black place). If you want the last white pixel before we hit black, add 1 to row. If row = 0, then there were no black pixels in the column above the clicked point.

Not satisfied with the answer ?? ASK NOW