Privacy Protection of Digital Images Using Watermarking and QR Code-based Visual Cryptography

Table 1

Literature review.

S. No	Author/year	Objective	Methodology	Limitation
(1)	Hsu et al./2007	To focus on circular visual cryptography in order to perform multiple secrets hiding	Multiple secrets and cryptography	There is lack of technical work
(2)	Feng et al./2008	To implement visual secret sharing in order to perform multiple secrets	Multiple secrets	Need to improve the scalability
(3)	Wang/2011	To implement random grid visual cryptography using identifiable shares	Visual cryptography	Limited scope
(4)	Hsu et al./2012	To focus on visual cryptography	Visual cryptography	Need to improve the efficiency of system
(5)	Lee and Chiu/2013	Considering image size invariant visual cryptography in area of general access structures subject to display quality constraints	Visual cryptography	No work is done in direction of security
(6)	Askari et al./2014	To implement novel visual cryptography schemes. Here work is done without pixel expansion for halftone image	Visual cryptography	Research is not worked on accuracy
(7)	Petrauskiene et al./2014	To propose dynamic visual cryptography in order to perform an optical assessment	Visual cryptography	Scope of this research is very less
(8)	Shankar and Eswaran/2016	To implement a secret image-sharing scheme in the area of visual cryptography	Image-sharing and visual cryptography	Need to enhance accuracy and performance
(9)	Punithavathi and Geetha/2016	Implementing cancellable biometric template security by making use of segment-dependent visual cryptography	Visual cryptography and security	Lack of accuracy
(10)	Chaturvedi and Bhat/2015	To improve the segment-based visual cryptography	Segment and visual cryptography	There is lack of performance
(11)	Chao and Fan/2017	Execution of random grid-based progressive visual secret-sharing scheme by making use of adaptive priority	Segment and visual cryptography	Lack of technical work
(12)	Chao and Fan/2017	To produce random grid-based visual secret sharing by making use of multilevel encoding	Multilevel encoding	Performance of this research is very low