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Motion blur and defocus blur are the common blur types which degrade image.
运动模糊和散焦模糊是常见的两种图像模糊类型。
The two parameters have good application in practical defocus analysis due to their independence of reference image.
图像熵和高阶累积量不需要参考图像，因此可以在实际的离焦分析中广泛应用。
A good test is to defocus just a bit and see if the image is nice and round or egg-shaped.
一个好的测试方法是虚焦一点点，看图像是不是圆形或者是蛋型的。
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