FIGURE 5.
Bounding box extraction using (a) threshold method, (b) binary image from thresholding, (c) the edge detection method, (d) edge detected with the ’Sobel’ operator.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.