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Estimate displacement field that aligns two 2-D or 3-D images

```
[D,moving_reg]
= imregdemons(moving,fixed)
```

`[___] = imregdemons(moving,fixed,N)`

```
[gpuarrayD,gpuarrayMoving_reg]
= imregdemons(gpuarrayMoving,gpuarrayFixed,N)
```

`[___] = imregdemons(___,Name,Value,...)`

`[`

estimates
the displacement field `D`

,`moving_reg`

]
= imregdemons(`moving`

,`fixed`

)`D`

that aligns the image
to be registered, `moving`

, with the reference
image, `fixed`

. `moving`

and `fixed`

are
2-D or 3-D intensity images.

The displacement vectors at each pixel location map locations
from the `fixed`

image grid to a corresponding
location in the `moving`

image. `moving_reg`

is
a warped version of the `moving`

image that is
warped according to the displacement field `D`

and
resampled using linear interpolation.

`[`

performs
the estimation on a GPU. `gpuarrayD`

,`gpuarrayMoving_reg`

]
= imregdemons(`gpuarrayMoving`

,`gpuarrayFixed`

,`N`

)

`[___] = imregdemons(___,`

registers
the moving image using name-value pairs to control aspects of weight
computation.`Name,Value`

,...)

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