background n. 1.后景,背景;基本情況;(紡織品等的)底子;出身;經(jīng)歷。 2.隱蔽的[不引人注目的]地位;幕后。 3.襯托音樂(lè),伴音;【無(wú)線電】干擾雜音 (students of workers' background. 工人出身的學(xué)生)。 in the background 背地下,背后;在幕后(活動(dòng))。
This arithmetic divides the wavelet coefficients of carrier image into 27 - classes by the background luminance , the texture and the edge mask character of visual system ; then after encrypting watermark image with magic cube transformation , the ycbcr model is employed , it embeds the watermark sequences in the carrier image with different intensity according to the coefficients " classes of carrier image in y channel 首先,將載體rgb圖像轉(zhuǎn)換到y(tǒng)cbcr顏色空間,然后提取亮度通道y ,將其進(jìn)行小波變換,然后利用人眼視覺(jué)模型對(duì)載體圖象分解后的小波系數(shù)進(jìn)行分類。其次,對(duì)有意義的水印圖像分別進(jìn)行3次不同的魔方置亂,得到3個(gè)隨機(jī)水印序列。