发明授权
US08594453B2 Method of robust alignment and payload recovery for data-bearing images 有权
数据承载图像的鲁棒对准和有效载荷恢复方法

Method of robust alignment and payload recovery for data-bearing images
摘要:
An example provides a system and method of robust alignment and payload recovery for data-bearing images. The method includes digitizing a printed version of a stegatone, computing the transformation parameters of the stegatone, and processing individual local regions of the stegatone to determine local transformation parameters. The method also includes performing an alignment evaluation to compute a metric value that represents the quality of a local alignment between a reference halftone and the stegatone. Further, the method includes selecting alignment parameters based on optimization of the metric value, mapping the shift of clustered-dots in each cell in comparison to the reference halftone, and recovering the payload by decoding the stegatone.
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