A QR Code Secret Hiding Scheme against Contrast Analysis Attack for the Internet of Things

Table 3

The revealed results of various situations.

Variance	0.1	0.3	0.5	0.7
Gaussian noise
QR content	Readable	Readable	Readable	Readable
Secret	Decodable	Decodable	Decodable	Decodable
Noise ratio	10%	30%	50%	70%
Salt&Pepper noise
QR content	Readable	Readable	Readable	Readable
Secret	Decodable	Decodable	Decodable	Decodable
Compression ratio	15%	30%	40%	50%
Jpg compression
QR content	Readable	Readable	Readable	Readable
Secret	Decodable	Decodable	Decodable	Decodable
broken’s blocks	1	2	4	8
Image damage
QR content	Readable	Readable	Readable	Readable
Rotation angle
Rotation
QR content	Readable	Readable	Readable	Readable
Secret	Decodable	Decodable	Decodable	Decodable