Hidden images in halftone pictures.
نویسندگان
چکیده
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.
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عنوان ژورنال:
- Applied optics
دوره 40 20 شماره
صفحات -
تاریخ انتشار 2001