Experiments with Deghosting Images using Hugin


Starting images.
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Starting with three images taken at Ickworth House, a National Trust Property in England. These photos have a group people wondering across infront of the house. The photographs have been aligned and straightened using Hugin.
LDR_exposure_layers_0000.tif
LDR_exposure_layers_0001.tif
LDR_exposure_layers_0002.tif
These files have been resized and converted to JPG for the website, but all processing was done use the internedaite outputs from Hugin.

Click images for full size, click pop-up to remove.

The Problem.

Shown below is the result of combining these images with Enfuse.

A 'ghostly' army of figures can be seen marching toward the house.

Using deghosting_mask.exe

Following up from earlier work support for deghosting combined images has been added into the Hugin source. Presently, this needs to be called from the commandline. In my case a windows 'bat' file.

deghosting_mask LDR_exposure_layers_0000.tif LDR_exposure_layers_0001.tif  LDR_exposure_layers_0002.tif

Using the default parameters results in three blank masks..

In the following examples I have increased the threshold parameter

Threshold 250

deghosting_mask -i 5 -t 250 -c 1 LDR_exposure_layers_0000.tif LDR_exposure_layers_0001.tif  LDR_exposure_layers_0002.tif
layers_0000_mask.tif
layers_0001_mask.tif
layers_0002_mask.tif
output.tif

Click images for full size, click pop-up to remove.

Threshold 254

deghosting_mask -i 5 -t 254 -c 1 LDR_exposure_layers_0000.tif LDR_exposure_layers_0001.tif  LDR_exposure_layers_0002.tif
layers_0000_mask.tif
layers_0001_mask.tif
layers_0002_mask.tif
output.tif

The mask now clearly do show the people as black shadows, and in the output the people are almost removed.

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Threshold 256

deghosting_mask -i 5 -t 256 -c 1 LDR_exposure_layers_0000.tif LDR_exposure_layers_0001.tif  LDR_exposure_layers_0002.tif
layers_0000_mask.tif
layers_0001_mask.tif
layers_0002_mask.tif
output.tif

Click images for full size, click pop-up to remove.

The army of ghost has been removed.

But a lot of high frequency noise has been introduced.