projection perimeter
... projection optimeter 投影学比较仪 projection perimeter 投影圆周 projection photometry 投影光度测量法 ...
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圆周投影 circular projecting
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实验结果表明，圆周积分投影和圆周梯度积分投影曲线具有良好的旋转和尺度不变性。
The experimental result shows that the curves corresponding to circular integral projecting and circular grads integral projecting own excellent steadiness when target rotates and flexes.
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