Table 6 NPCR analysis.

From: A lightweight multi round confusion-diffusion cryptosystem for securing images using a modified 5D chaotic system

Dicom images

NPCR (%)

NPCR critical values

N*0.05 = 99.5693%

N*0.01 = 99.5527%

N*0.001 = 99.5341%

Sample 1

99.6017

Pass

Pass

Pass

Sample 2

99.6017

Pass

Pass

Pass

Sample 3

99.6109

Pass

Pass

Pass

Sample 4

99.5972

Pass

Pass

Pass

Sample 5

99.5773

Pass

Pass

Pass

Sample 6

99.6506

Pass

Pass

Pass

Sample 7

99.6307

Pass

Pass

Pass

Sample 8

99.6017

Pass

Pass

Pass

Sample 9

99.5697

Pass

Pass

Pass

Sample 10

99.6292

Pass

Pass

Pass