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

Figure 9

Robustness experiment. (a) JPEG compression. (b) Brightness adjustment. (c) Contrast adjustment. (d) Salt & Pepper. (e) Image resizing. (f) 3 × 3 Gaussian low-pass filter. (g) Rotation. (h) Watermark embedding. (i) Gamma correction. (j) Speckle.

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