Robust Image Hashing Based on Cool and Warm Hue and Space Angle

Table 4

Threshold selection.

Threshold	Collision rate	Error detection rate
127	0	1.38 × 10^−2
140	4.00 × 10^−6	2.06 × 10^−3
150	1.00 × 10^−5	2.62 × 10^−4
160	4.60 × 10^−5	1.43 × 10^−5
168	1.76 × 10^−4	0