find_local_deformable_modelT_find_local_deformable_modelFindLocalDeformableModelFindLocalDeformableModel (Operator)

Name

find_local_deformable_modelT_find_local_deformable_modelFindLocalDeformableModelFindLocalDeformableModel — Find the best matches of a local deformable model in an image.

Signature

Description

The operator find_local_deformable_modelfind_local_deformable_modelFindLocalDeformableModelFindLocalDeformableModelFindLocalDeformableModel finds the best NumMatchesNumMatchesNumMatchesNumMatchesnumMatches instances of the locally deformable model ModelIDModelIDModelIDModelIDmodelID in the input ImageImageImageImageimage. The model must have been created previously by calling create_local_deformable_modelcreate_local_deformable_modelCreateLocalDeformableModelCreateLocalDeformableModelCreateLocalDeformableModel or read_deformable_modelread_deformable_modelReadDeformableModelReadDeformableModelReadDeformableModel.

The model is searched within those points of the domain of the image in which the model lies completely within the image. This means that the model will not be found if it extends beyond the borders of the image, even if it would achieve a score greater than MinScoreMinScoreMinScoreMinScoreminScore. Note that, if for a certain pyramid level the model touches the image border, it might not be found even if it lies completely within the original image. As a rule of thumb, the model might not be found if its distance to an image border falls below . This behavior can be changed with set_system('border_shape_models','true'), which will cause models that extend beyond the image border to be found if they achieve a score greater than MinScoreMinScoreMinScoreMinScoreminScore. Here, points lying outside the image are regarded as being occluded, i.e., they lower the score. It should be noted that the runtime of the search will increase in this mode. Note further, that in rare cases, which occur typically only for artificial images, the model might not be found also if for certain pyramid levels them model touches the border of the reduced domain. Then, it may help to enlarge the reduced domain by using, e.g., dilation_circledilation_circleDilationCircleDilationCircleDilationCircle.

The operator find_local_deformable_modelfind_local_deformable_modelFindLocalDeformableModelFindLocalDeformableModelFindLocalDeformableModel returns the RowRowRowRowrow and ColumnColumnColumnColumncolumn coordinates of the found instances. Additionally, a rectified part of the image, the respective vector field, and the contours of the found deformed model instance can be returned in ImageRectifiedImageRectifiedImageRectifiedImageRectifiedimageRectified, VectorFieldVectorFieldVectorFieldVectorFieldvectorField, and DeformedContoursDeformedContoursDeformedContoursDeformedContoursdeformedContours. By default, these iconic objects are not returned. In case that they are needed the parameter ResultTypeResultTypeResultTypeResultTyperesultType should be set to 'image_rectified', 'vector_field' and 'deformed_contours'. The size of ImageRectifiedImageRectifiedImageRectifiedImageRectifiedimageRectified and VectorFieldVectorFieldVectorFieldVectorFieldvectorField is the smallest axis-aligned rectangle of the domain of the image that was used to create the local deformable model with create_local_deformable_modelcreate_local_deformable_modelCreateLocalDeformableModelCreateLocalDeformableModelCreateLocalDeformableModel. The size of the rectified image and the vector field can be expanded in all directions by setting GenParamNameGenParamNameGenParamNameGenParamNamegenParamName to 'expand_border' and the respective GenParamValueGenParamValueGenParamValueGenParamValuegenParamValue to the number of pixels. Optionally, a specific direction can be selected with 'expand_border_top', 'expand_border_bottom', 'expand_border_left', and 'expand_border_right'. Please note that the returned VectorFieldVectorFieldVectorFieldVectorFieldvectorField is in absolute coordinates and can be used for convert_map_typeconvert_map_typeConvertMapTypeConvertMapTypeConvertMapType.

The smoothness of the estimated deformation can be selected with GenParamNameGenParamNameGenParamNameGenParamNamegenParamName set to 'deformation_smoothness'. The value for 'deformation_smoothness' can be imagined as the size of a smoothing filter to the estimated deformation field. A too small value expects a strong deformation a too big value expects a rigid object. The minimal value for 'deformation_smoothness' is 3, a typical value is 11, and the value can be increased further for only small global deformations.

Finally, the score of each found instance is returned in ScoreScoreScoreScorescore. The score is a number between 0 and 1, which is an approximate measure of how much of the model is visible in the image.

For further explanation on the parameters used for the search of a local deformable model we refer to the description of find_planar_uncalib_deformable_modelfind_planar_uncalib_deformable_modelFindPlanarUncalibDeformableModelFindPlanarUncalibDeformableModelFindPlanarUncalibDeformableModel.

Execution Information

• Multithreading type: reentrant (runs in parallel with non-exclusive operators).
• Multithreading scope: global (may be called from any thread).
• Automatically parallelized on internal data level.

Parameters

Result

If the parameters are valid, the operator find_local_deformable_modelfind_local_deformable_modelFindLocalDeformableModelFindLocalDeformableModelFindLocalDeformableModel returns the value 2 (H_MSG_TRUE). If necessary an exception is raised.

Possible Predecessors

create_local_deformable_modelcreate_local_deformable_modelCreateLocalDeformableModelCreateLocalDeformableModelCreateLocalDeformableModel, create_local_deformable_model_xldcreate_local_deformable_model_xldCreateLocalDeformableModelXldCreateLocalDeformableModelXldCreateLocalDeformableModelXld, read_deformable_modelread_deformable_modelReadDeformableModelReadDeformableModelReadDeformableModel

Module

Matching