PCB Defects Detection with OpenCV. June 20, 2014 by Vincent Kok Comments 12. ... Next, we convert the grayscale image to binary image that consist only binary pixel ‘1’ or ‘0’ for easy operation ...

The line function expects the image and four more arguments: the start of the line in (x1, y1), the end of the line in (x2, y2), the line’s color (in BGR for our image), and its thickness in pixels.