title: Hidden images in halftone pictures.
abstract: A method of concealing an image in a different halftone image is proposed. Continuous-tone levels of the visible images are represented by the area of the halftone dots. However, the hidden image is encoded by the dots' positions inside their cells. Only a spatial correlator with a unique filter function can reveal the hidden image from the halftone picture. The technique and its robustness to noise and distortions are demonstrated.
authors: J
authors: J
authors: Rosen
authors: B
authors: B
authors: Javidi