geometry attack 几何攻击
It's difficult to detect blindly the image rotation Angle in blind watermarking under geometry attack.
抗几何攻击的盲检测数字水印的难点是图像旋转角度的盲检测。
Using the unsteady method, optimal Angle of attack and specific Power are calculated respectively according to the real geometry and kinematics.
利用上述方法计算了实际几何和运动参数下昆虫的最佳攻角和比功率。
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