In order to resist the collusion attack,a high-capacity and blind-detection fingerprinting scheme for image is proposed in spatial domain.The orthogonal basic vectors are modulated with anti-collusion codes to generate binary fingerprints,and all pixels of the original image are quantized according to fingerprint states for fingerprint embedding.During colluder tracing,the fingerprints are extracted by judging pixels′ gray levels of the tested image at first,and then a new vector is derived from...