create_trained_component_modelT_create_trained_component_modelCreateTrainedComponentModelCreateTrainedComponentModel (Operator)

Name

create_trained_component_modelT_create_trained_component_modelCreateTrainedComponentModelCreateTrainedComponentModel — Prepare a component model for matching based on trained components.

Signature

Description

create_trained_component_modelcreate_trained_component_modelCreateTrainedComponentModelCreateTrainedComponentModelCreateTrainedComponentModel prepares the training result, which is passed in ComponentTrainingIDComponentTrainingIDComponentTrainingIDComponentTrainingIDcomponentTrainingID, as a component model for matching. The output parameter ComponentModelIDComponentModelIDComponentModelIDComponentModelIDcomponentModelID is a handle for this model, which is used in subsequent calls to find_component_modelfind_component_modelFindComponentModelFindComponentModelFindComponentModel. In contrast to create_component_modelcreate_component_modelCreateComponentModelCreateComponentModelCreateComponentModel, the model components must have been previously trained using train_model_componentstrain_model_componentsTrainModelComponentsTrainModelComponentsTrainModelComponents before calling create_trained_component_modelcreate_trained_component_modelCreateTrainedComponentModelCreateTrainedComponentModelCreateTrainedComponentModel.

The parameters AngleStartAngleStartAngleStartAngleStartangleStart and AngleExtentAngleExtentAngleExtentAngleExtentangleExtent determine the range of possible rotations of the component model in an image.

Internally, a separate shape model is built for each model component (see create_shape_modelcreate_shape_modelCreateShapeModelCreateShapeModelCreateShapeModel). Therefore, the parameters MinContrastCompMinContrastCompMinContrastCompMinContrastCompminContrastComp, MinScoreCompMinScoreCompMinScoreCompMinScoreCompminScoreComp, NumLevelsCompNumLevelsCompNumLevelsCompNumLevelsCompnumLevelsComp, AngleStepCompAngleStepCompAngleStepCompAngleStepCompangleStepComp, OptimizationCompOptimizationCompOptimizationCompOptimizationCompoptimizationComp, MetricCompMetricCompMetricCompMetricCompmetricComp, and PregenerationCompPregenerationCompPregenerationCompPregenerationComppregenerationComp correspond to the parameters of create_shape_modelcreate_shape_modelCreateShapeModelCreateShapeModelCreateShapeModel, with the following differences: First, the parameter OptimizationOptimizationOptimizationOptimizationoptimization of create_shape_modelcreate_shape_modelCreateShapeModelCreateShapeModelCreateShapeModel provides the possibility to reduce the number of model points as well as the possibility to completely pregenerate the shape model. In contrast, the operator create_trained_component_modelcreate_trained_component_modelCreateTrainedComponentModelCreateTrainedComponentModelCreateTrainedComponentModel uses a separate parameter PregenerationCompPregenerationCompPregenerationCompPregenerationComppregenerationComp in order to decide whether the shape models should be completely pregenerated or not. A second difference concerning the parameter MinScoreCompMinScoreCompMinScoreCompMinScoreCompminScoreComp should be noted. When using the shape-based matching, this parameter needs not be passed when preparing the shape model using create_shape_modelcreate_shape_modelCreateShapeModelCreateShapeModelCreateShapeModel but only during the search using find_shape_modelfind_shape_modelFindShapeModelFindShapeModelFindShapeModel. In contrast, when preparing the component model it is favorable to analyze rotational symmetries of the model components and similarities between the model components. However, this analysis only leads to meaningful results if the value for MinScoreCompMinScoreCompMinScoreCompMinScoreCompminScoreComp that is used during the search (see find_component_modelfind_component_modelFindComponentModelFindComponentModelFindComponentModel) is already approximately known. After the search with find_component_modelfind_component_modelFindComponentModelFindComponentModelFindComponentModel the pose parameters of the components in a search image are returned. Note that the pose parameters refer to the reference points of the components. The reference point of a component is the center of gravity of its associated region that is returned in ModelComponentsModelComponentsModelComponentsModelComponentsmodelComponents of train_model_componentstrain_model_componentsTrainModelComponentsTrainModelComponentsTrainModelComponents.

The parameters MinContrastCompMinContrastCompMinContrastCompMinContrastCompminContrastComp, NumLevelsCompNumLevelsCompNumLevelsCompNumLevelsCompnumLevelsComp, AngleStepCompAngleStepCompAngleStepCompAngleStepCompangleStepComp, and OptimizationCompOptimizationCompOptimizationCompOptimizationCompoptimizationComp can be automatically determined by passing 'auto'"auto""auto""auto""auto" for the respective parameters.

All component-specific input parameters (parameter names terminate with the suffix Comp) must either contain one element, in which case the parameter is used for all model components, or must contain the same number of elements as the number of model components contained in ComponentTrainingIDComponentTrainingIDComponentTrainingIDComponentTrainingIDcomponentTrainingID, in which case each parameter element refers to the corresponding component in ComponentTrainingIDComponentTrainingIDComponentTrainingIDComponentTrainingIDcomponentTrainingID.

In addition to the individual shape models, the component model also contains information about the way the single model components must be searched relative to each other using find_component_modelfind_component_modelFindComponentModelFindComponentModelFindComponentModel in order to minimize the computation time of the search. For this, the components are represented in a tree structure. First, the component that stands at the root of this search tree (root component) is searched. Then, the remaining components are searched relative to the pose of their predecessor in the search tree.

The root component can be passed as an input parameter of find_component_modelfind_component_modelFindComponentModelFindComponentModelFindComponentModel during the search. To what extent a model component is suited to act as root component depends on several factors. In principle, a model component that can be found in the image with a high probability should be chosen. Therefore, a component that is sometimes occluded to a high degree or that is missing in some cases is not well suited to act as root component. Additionally, the computation time that is associated with the root component during the search can serve as a criterion. A ranking of the model components that is based on the latter criterion is returned in RootRankingRootRankingRootRankingRootRankingrootRanking. In this parameter the indices of the model components are sorted in descending order according to their associated computation time, i.e., RootRankingRootRankingRootRankingRootRankingrootRanking[0] contains the index of the model component that, chosen as root component, allows the fastest search. Note that the ranking returned in RootRankingRootRankingRootRankingRootRankingrootRanking represents only a coarse estimation. Furthermore, the calculation of the root ranking assumes that the image size as well as the value of the system parameter 'border_shape_models'"border_shape_models""border_shape_models""border_shape_models""border_shape_models" are identical when calling create_trained_component_modelcreate_trained_component_modelCreateTrainedComponentModelCreateTrainedComponentModelCreateTrainedComponentModel and find_component_modelfind_component_modelFindComponentModelFindComponentModelFindComponentModel.

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 returns a handle. Note that the state of an instance of this handle type may be changed by specific operators even though the handle is used as an input parameter by those operators.

Parameters

Example (HDevelop)

* Get the model image.
read_image (ModelImage, 'model_image.tif')
* Define the regions for the initial components.
gen_rectangle2 (InitialComponentRegions, 212, 233, 0.62, 167, 29)
gen_rectangle2 (Rectangle2, 298, 363, 1.17, 162, 34)
gen_rectangle2 (Rectangle3, 63, 444, -0.26, 50, 27)
gen_rectangle2 (Rectangle4, 120, 473, 0, 33, 20)
concat_obj (InitialComponentRegions, Rectangle2, InitialComponentRegions)
concat_obj (InitialComponentRegions, Rectangle3, InitialComponentRegions)
concat_obj (InitialComponentRegions, Rectangle4, InitialComponentRegions)
* Get the training images.
gen_empty_obj (TrainingImages)
for i := 1 to 4 by 1
    read_image (TrainingImage, 'training_image-'+i+'.tif')
    concat_obj (TrainingImages, TrainingImage, TrainingImages)
endfor
* Extract the model components and train the relations.
train_model_components (ModelImage, InitialComponentRegions, \
                        TrainingImages, ModelComponents, 22, 60, 30, 0.65, \
                        0, 0, rad(60), 'speed', 'rigidity', 0.2, 0.4, \
                        ComponentTrainingID)
* Create the component model based on the training result.
create_trained_component_model (ComponentTrainingID, -rad(30), rad(60), 10, \
                                0.5, 'auto', 'auto', 'none', \
                                'use_polarity', 'false', ComponentModelID, \
                                RootRanking)
* Find the component model in a run-time image.
read_image (SearchImage, 'search_image.tif')
find_component_model (SearchImage, ComponentModelID, RootRanking, -rad(30), \
                      rad(60), 0.5, 0, 0.5, 'stop_search', 'prune_branch', \
                      'none', 0.55, 'least_squares', 0, 0.9, ModelStart, \
                      ModelEnd, Score, RowComp, ColumnComp, AngleComp, \
                      ScoreComp, ModelComp)

Result

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

Possible Predecessors

train_model_componentstrain_model_componentsTrainModelComponentsTrainModelComponentsTrainModelComponents, read_training_componentsread_training_componentsReadTrainingComponentsReadTrainingComponentsReadTrainingComponents

Possible Successors

find_component_modelfind_component_modelFindComponentModelFindComponentModelFindComponentModel

Alternatives

create_component_modelcreate_component_modelCreateComponentModelCreateComponentModelCreateComponentModel

See also

create_shape_modelcreate_shape_modelCreateShapeModelCreateShapeModelCreateShapeModel, find_shape_modelfind_shape_modelFindShapeModelFindShapeModelFindShapeModel

Module

Matching