Obtuse Angle Prediction and Factor Evaluation for Image Reversible Data Hiding

Table 12

Comparisons in view of PSNR (dB) for [34, 37–39], OAP-I, and OAP-II with the payload of 20000 bits.

Image	Luo et al.	Hong	Li et al.	RAP	OAP-I	OAP-II
Lena	53.83	54.90	56.22	56.70	56.73	56.82
Airplane	55.44	58.59	58.14	59.92	59.97	59.94
Barbara	52.66	54.94	54.73	55.61	56.62	56.57
Boat	51.19	52.29	53.31	54.20	54.42	54.12
Peppers	52.21	52.15	54.72	55.03	55.32	55.23
Average	53.07	54.57	55.42	56.29	56.61	56.54