Correction to: Multimedia Tools and Applications (2018)

https://doi.org/10.1007/s11042-018-6813-8

The expression J’ in pages 4, 6, 9, 12 and 13 of the original publication were incorrectly written as J where the symbol prime (‘) was missing. Also the expression Pi,j found in page 5 of the original publication was incorrectly written as Pi,j.

The original article has been corrected.