“…Much of the research focused on reversible data hiding is in pixel domain. They are based on lossless compression [ 2 , 3 , 4 , 5 , 6 ], difference expansion [ 7 , 8 , 9 , 10 , 11 , 12 , 13 ], or histogram shifting [ 7 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 ]. A recent advances [ 19 , 20 , 39 , 40 ] use two dimensional histogram shifting to achieve higher embedding capacity and lower distortion.…”