Image Scrambling Degree Evaluation Method Based on Walsh Transformation

In the context of information hiding and digital watermarking, it is of major importance to evaluate the image scrambling degree (ISD). It is helpful to decide what kind of transformation to be selected to scramble an image and how far to scramble it in order to obtain the best imperceptibility and robustness. To present a new metric for objectively assessing the ISD. The method utilizes the performance of energy concentration of Walsh transformation and takes into account the characteristics that a good ISD measurement method should be contented. Experimental results show that the proposed method is effective to assess the ISD, which correlates well with subjective assessment.