Question: What is the difference between the bold k and the other k? and Why we calculate histogram before and after embedding in the image processing?

What is the difference between the bold k and the other

What is the difference between the bold k and the other k?

and

Why we calculate histogram before and after embedding in the image processing?

Original image Histogram Set k= Find k pair of maximum and minimum points Hidden data Yes Pure payload enough? Set minimum points as zero points Shift HistogramEmbedding No Overhead information k-k+ Yes k

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