为什么要说F是一个梯度场？
Now it should be a gradient field.
那么它应该就是一个梯度场。
也就是梯度场。
So, indeed, this is not a gradient field.
因此这不是一个梯度场。
It is a gradient field. We need three conditions.
这是一个有势场，我们需要三个条件。
We have said if we have a gradient field then we have this.
如果有一个梯度场，那就能得到这个。
If you have a gradient field then it should have this property.
如果给定一个梯度场，那么它就应该满足这个性质。
So, in particular, only if you have a conservative field, a gradient field.
特别地，仅当是保守场，即有势场时才可以使用。
An enhanced image is finally reconstructed from the target gradient field by least square fitting.
最后采用最小二乘拟合从目标梯度场重建出增强后的图像。
An enhanced image is finally reconstructed from the target gradient field by least square fitting.
最后采用最小二乘拟合从目标梯度场重建出增强后的图像。
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