Fig 2. An image and its image features.
(A) An image. (B)-(F) The 0-th to 4-th level wavelet coefficients of (A) (Wavelet-0, …, Wavelet-4). (G)-(K) The histogram of the 0-th to 4-th level wavelet coefficients of (A) (HoW-0, …, HoW-4).
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.