set_planar_uncalib_deformable_model_metricT_set_planar_uncalib_deformable_model_metricSetPlanarUncalibDeformableModelMetricSetPlanarUncalibDeformableModelMetric (Operator)

Name

set_planar_uncalib_deformable_model_metricT_set_planar_uncalib_deformable_model_metricSetPlanarUncalibDeformableModelMetricSetPlanarUncalibDeformableModelMetric — Set the metric of a planar uncalibrated deformable model that was created from XLD contours.

Signature

Description

set_planar_uncalib_deformable_model_metricset_planar_uncalib_deformable_model_metricSetPlanarUncalibDeformableModelMetricSetPlanarUncalibDeformableModelMetricSetPlanarUncalibDeformableModelMetric changes the value of the parameter MetricMetricMetricMetricmetric that was selected during the creation of the deformable model ModelIDModelIDModelIDModelIDmodelID from XLD contours. Because no information about the polarity of the model contours is available for XLD contours, the polarity is determined based on a representative ImageImageImageImageimage. For this, the model contours are mapped to the respective position where the object appears in the ImageImageImageImageimage using HomMat2DHomMat2DHomMat2DHomMat2DhomMat2D, which can be obtained by a previous call to find_planar_uncalib_deformable_modelfind_planar_uncalib_deformable_modelFindPlanarUncalibDeformableModelFindPlanarUncalibDeformableModelFindPlanarUncalibDeformableModel.

The parameter MetricMetricMetricMetricmetric then determines the conditions under which the model is recognized later in the search image. If MetricMetricMetricMetricmetric = 'use_polarity'"use_polarity""use_polarity""use_polarity""use_polarity", the object in the image and the model must have the same contrast. If, e.g., the model is a bright object on a dark background, the object is found only if it is also brighter than the background. If MetricMetricMetricMetricmetric = 'ignore_global_polarity'"ignore_global_polarity""ignore_global_polarity""ignore_global_polarity""ignore_global_polarity", the object is found in the image also if the contrast reverses globally. In the above example, the object hence is also found if it is darker than the background. The runtime of find_planar_uncalib_deformable_modelfind_planar_uncalib_deformable_modelFindPlanarUncalibDeformableModelFindPlanarUncalibDeformableModelFindPlanarUncalibDeformableModel will increase slightly in this case.

It must be ensured that the object contours in the ImageImageImageImageimage have the same (or inverse) polarity as the object contours in the image in which the object must be searched later. Especially, the object must not be occluded in the ImageImageImageImageimage and the background must be either brighter than the object or darker. Otherwise, the determined polarity of the model contour will not represent the polarity of the object contour during the search. Note that only the polarity of the contours is determined, not their contrast. Note also that the polarity is determined from a single-channel image, only. If a multi-channel image is passed in ImageImageImageImageimage, only the first channel will be used (and no error message will be returned).

A typical proceeding is to read the XLD contours from file. Since these XLD contours do not provide polarity information, the model must be created from the XLD contours by setting the parameter MetricMetricMetricMetricmetric to 'ignore_local_polarity'"ignore_local_polarity""ignore_local_polarity""ignore_local_polarity""ignore_local_polarity". Then, in a first search image the model is recognized. The transformation that maps the model contours to the position of the object in the search image (HomMat2DHomMat2DHomMat2DHomMat2DhomMat2D) can be determined from the matching result. To verify the match interactively, the model contours can be mapped to this position. If the matching result is correct, the value of the parameter MetricMetricMetricMetricmetric can be changed, e.g., to 'use_polarity'"use_polarity""use_polarity""use_polarity""use_polarity". This leads to a faster and more robust recognition in the following images.

Attention

set_planar_uncalib_deformable_model_metricset_planar_uncalib_deformable_model_metricSetPlanarUncalibDeformableModelMetricSetPlanarUncalibDeformableModelMetricSetPlanarUncalibDeformableModelMetric can only be used with deformable models that were created from XLD contours.

Execution Information

• Multithreading type: reentrant (runs in parallel with non-exclusive operators).
• Multithreading scope: global (may be called from any thread).
• Processed without parallelization.

This operator modifies the state of the following input parameter:

• ModelIDModelIDModelIDModelIDmodelID

During execution of this operator, access to the value of this parameter must be synchronized if it is used across multiple threads.

Parameters

Result

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

Possible Predecessors

create_planar_uncalib_deformable_model_xldcreate_planar_uncalib_deformable_model_xldCreatePlanarUncalibDeformableModelXldCreatePlanarUncalibDeformableModelXldCreatePlanarUncalibDeformableModelXld, find_planar_uncalib_deformable_modelfind_planar_uncalib_deformable_modelFindPlanarUncalibDeformableModelFindPlanarUncalibDeformableModelFindPlanarUncalibDeformableModel

Possible Successors

find_planar_uncalib_deformable_modelfind_planar_uncalib_deformable_modelFindPlanarUncalibDeformableModelFindPlanarUncalibDeformableModelFindPlanarUncalibDeformableModel

See also

create_planar_uncalib_deformable_model_xldcreate_planar_uncalib_deformable_model_xldCreatePlanarUncalibDeformableModelXldCreatePlanarUncalibDeformableModelXldCreatePlanarUncalibDeformableModelXld

Module

Matching