In the recent paper entitled "Homomorphic image watermarking with a singular value decomposition algorithm" by Abdallah et?al., a homomorphic image watermarking using a singular value decomposition is presented. This comment shows that this watermarking scheme is fundamentally flawed in that the extracted watermark is not the embedded watermark but determined by the reference watermark.
['Khaled Loukhaoukha', 'Ahmed Refaey', 'Khalil Zebbiche']
Comments on Homomorphic image watermarking with a singular value decomposition algorithm