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.
Scanned document images after image preprocessing. (A) The original scanned image. (B) The gray-scaled image. (C) The image with 20% increased contrast. (D) The image with 60% increased contrast. (E) The image with dilation and erosion and 20% increased contrast. (F) the image with dilation and erosion and 60% increased contrast.
