2026-04-17T03:39:12Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/984402026-01-21T04:53:49Zcom_2072_1033col_2072_452950

00925njm 22002777a 4500 dc Sayrol Clols, Elisa author Vidal Manzano, José author Cabanillas, Silvia author Santamaria, Sonia author 1999 This work concentrates on the problem of watermarking embedding and optimum detection in color images through the use of spread spectrum techniques both in space (Direct Sequence Spread Spectrum or DSSS) and frequency (Frequency Hopping). It is applied to RGB and opponent color component representations Perceptive information is considered in both color systems. Some tests are performed in order to ensure imperceptibility and to assess detection quality of the optimum color detectors. Peer Reviewed Postprint (published version) Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Processament del senyal::Processament de la imatge i del senyal vídeo Image processing -- Digital techniques Watermarking Color Spread spectrum communication Detectors Humans Frequency Visual system Psychology Testing Performance evaluation Imatges -- Processament -- Tècniques digitals Optimum watermark detection in color images