2026-04-13T01:04:25Zhttps://recercat.cat/oai/request

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

urn:hdl:2117/98440 Optimum watermark detection in color images Sayrol Clols, Elisa Vidal Manzano, José Cabanillas, Silvia Santamaria, Sonia 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 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) 1999 Conference report http://ieeexplore.ieee.org.recursos.biblioteca.upc.edu/document/822890/ Open Access Institute of Electrical and Electronics Engineers (IEEE)