“It is well known how beneficially people can be influenced by the conviction that they are poised on the threshold of a new age.”
“I crossed the threshold and re-entered the house, which was buzzing with undying activity.”
“He sailed back to England, convinced that he was on the threshold of a great discovery.”
thresholding
(image processing) The process of creating a black-and-white image out of a grayscale image by setting exactly those pixels to white whose value is above a given threshold, and setting the other pixels to black.