基于lsb的直接4bit水印算法 直接4bit法\lena.bmp ..........\Lena1.bmp ..........\woman.bmp ..........\zhijie4bit.bmp ..........\zhijie4bitgray.m ..........\zhijie4bitrgb.m ..........\zhijie4bitrgbgai.asv ..........\zhijie4bitrgbgai.m 直接4bit法