Merge the range maps and build the model

From Meshlab

Here we describe the various parameters involved in the creation of range maps from the raw data coming out from the web reconstruciton service.

It is possible to modify several parameters in order to produce 3D range maps that are cleaner and affected by lower noise.

Parameters description:

• Subsample
  Indicates the level of subsampling of the range maps used.
  Example: for a range map of 600x400 a level of 2 indicates that you use a 300x200 pixels in total for each range map.
  This parameter is used to reduce the final number of vertices of the model. The reduction is done in a weighted manner.
• Minimum Count
  Indicates the minimum number of occurrences required for a value of depth to be considered for the reconstruction.
  Example: if Minimum Count is set to 6 a value of depth that has no correspondences in at least 6 range maps is not used to build the model.
• Minimum Angle
  faces that haves their normal forming an angle with view direction larger than the indicated value (in degree) are deleted.
• Feature Aware Smoothing
  ...todo... [Paolo]
• Remove Pieces less than
  After the meshing all the dangling pieces composed by a number of faces smaller than the indicated values are deleted. In this way you can automatically delete all the small floating pieces that usually are just noise.
• Close Pieces less than
  ...todo... [Paolo]
• Depth Filter
  The depth filter is used to reduce the noise of the estimated range maps. Sometimes could happen that the computed range maps are noisy, especially near high depth gradient. With this parameters the user can control a filter bank (dilation and erosion filter) to reduce this undesired effect that results in geometric artifacts on the model's surface. The dilation filter is applied before the erosion one. The defaults parameters are good in most cases. The erosion reduce the reconstructed surface area, hence to reconstruct more detail reduce the steps or size of this filter. If the range maps still remains noisy after the filtering increase the erosion steps or size. Increase dilation steps or size in case of holes in the reconstructed surfaces.
• Fast Merge
  This option active a fast merge process but produce a less accurate model. If high accuracy is not required or many range maps have to be processed this option should be active.
• Resolution
  ...todo... [Paolo]