set_shape_model_clutterT_set_shape_model_clutterSetShapeModelClutterSetShapeModelClutterset_shape_model_clutter (Operator)

Name

set_shape_model_clutterT_set_shape_model_clutterSetShapeModelClutterSetShapeModelClutterset_shape_model_clutter — Set the clutter parameters of a shape model.

Signature

Description

set_shape_model_clutterset_shape_model_clutterSetShapeModelClutterSetShapeModelClutterSetShapeModelClutterset_shape_model_clutter sets the clutter parameters of the shape model ModelIDModelIDModelIDModelIDmodelIDmodel_id. In particular, a region is defined relative to the model contours, in which no (or too faint) clutter edges should occur in the search image. This is helpful, e.g., if it is a special characteristic of the model that, in specific parts near to the model, structures are missing.

For example, within the HDevelop example program find_shape_model_clutter.hdev, the model corresponds to a ball in a ball grid array (BGA). As the ball grid array represents a repeating pattern, many matches are returned when matching is applied without considering the neighborhood of the model. By defining a clutter region, the search can be restricted to specific instances of the model.

For matches found in a search image, edges within the clutter region increase the resulting clutter scores. These are returned by find_shape_modelfind_shape_modelFindShapeModelFindShapeModelFindShapeModelfind_shape_model, find_scaled_shape_modelfind_scaled_shape_modelFindScaledShapeModelFindScaledShapeModelFindScaledShapeModelfind_scaled_shape_model, find_aniso_shape_modelfind_aniso_shape_modelFindAnisoShapeModelFindAnisoShapeModelFindAnisoShapeModelfind_aniso_shape_model, find_shape_modelsfind_shape_modelsFindShapeModelsFindShapeModelsFindShapeModelsfind_shape_models, find_scaled_shape_modelsfind_scaled_shape_modelsFindScaledShapeModelsFindScaledShapeModelsFindScaledShapeModelsfind_scaled_shape_models, and find_aniso_shape_modelsfind_aniso_shape_modelsFindAnisoShapeModelsFindAnisoShapeModelsFindAnisoShapeModelsfind_aniso_shape_models in the parameter ScoreScoreScoreScorescorescore, following the common values measuring how much of the model is visible in the image. Note that the input parameter MinScoreMinScoreMinScoreMinScoreminScoremin_score of those operators additionally expects information specifying the maximum clutter score up to which matches should be returned. For more information regarding the setting of MinScoreMinScoreMinScoreMinScoreminScoremin_score, please refer to the respective operator reference.

To define the clutter region relative to the model contours, you need the region ClutterRegionClutterRegionClutterRegionClutterRegionclutterRegionclutter_region and the transformation matrix HomMat2DHomMat2DHomMat2DHomMat2DhomMat2Dhom_mat_2d that maps the model contours to the respective position where the object appears in an image. Typically, you obtain them by searching for a model instance in an image, e.g., with the operator find_shape_modelfind_shape_modelFindShapeModelFindShapeModelFindShapeModelfind_shape_model. Then, the transformation matrix can be determined with the procedure get_hom_mat2d_from_matching_result using the respective output parameters of the search. The region ClutterRegionClutterRegionClutterRegionClutterRegionclutterRegionclutter_region is specified within the same image. Note that ClutterRegionClutterRegionClutterRegionClutterRegionclutterRegionclutter_region should contain the regions around the superfluous edges that are typical for all expected manifestations of the matches. We recommend that the clutter region is chosen larger than necessary when large scale ranges are searched. Furthermore, choosing the clutter region not too near to the expected model contours can increase the robustness.

The parameter ClutterContrastClutterContrastClutterContrastClutterContrastclutterContrastclutter_contrast determines the contrast the edges in the clutter region must have in order to be counted as clutter. In many applications, the parameter ContrastContrastContrastContrastcontrastcontrast, which has been used to create the shape model, is also a reasonable choice for ClutterContrastClutterContrastClutterContrastClutterContrastclutterContrastclutter_contrast. ClutterContrastClutterContrastClutterContrastClutterContrastclutterContrastclutter_contrast may not be smaller than the parameter MinContrastMinContrastMinContrastMinContrastminContrastmin_contrast of the shape model, otherwise an error is raised at runtime. The polarity of the found clutter edges is ignored, i.e., bright objects on a dark background will yield the same clutter score as dark objects on a bright background, independent of the parameter MetricMetricMetricMetricmetricmetric of the shape model. Please note that of all shape-based matching results, clutter scores are affected the most when a variation of illumination occurs.

With GenParamNameGenParamNameGenParamNameGenParamNamegenParamNamegen_param_name set to 'clutter_border_mode'"clutter_border_mode""clutter_border_mode""clutter_border_mode""clutter_border_mode""clutter_border_mode", the behavior of the clutter score can be influenced in cases where the clutter region of a found match is not entirely contained in the image domain. The corresponding values for 'clutter_border_mode'"clutter_border_mode""clutter_border_mode""clutter_border_mode""clutter_border_mode""clutter_border_mode" (GenParamValueGenParamValueGenParamValueGenParamValuegenParamValuegen_param_value) can be 'clutter_border_average'"clutter_border_average""clutter_border_average""clutter_border_average""clutter_border_average""clutter_border_average" or 'clutter_border_empty'"clutter_border_empty""clutter_border_empty""clutter_border_empty""clutter_border_empty""clutter_border_empty".

• 'clutter_border_average'"clutter_border_average""clutter_border_average""clutter_border_average""clutter_border_average""clutter_border_average":

  When GenParamValueGenParamValueGenParamValueGenParamValuegenParamValuegen_param_value is set to 'clutter_border_average'"clutter_border_average""clutter_border_average""clutter_border_average""clutter_border_average""clutter_border_average" (default), the hidden part of the clutter region is assumed to be filled on average as is its visible part. If the clutter region is not visible at all, the clutter score of the found match is set to 0.0.

• 'clutter_border_empty'"clutter_border_empty""clutter_border_empty""clutter_border_empty""clutter_border_empty""clutter_border_empty":

  When GenParamValueGenParamValueGenParamValueGenParamValuegenParamValuegen_param_value is set to 'clutter_border_empty'"clutter_border_empty""clutter_border_empty""clutter_border_empty""clutter_border_empty""clutter_border_empty", the clutter region is assumed to be empty where it is not visible.

Note that GenParamValueGenParamValueGenParamValueGenParamValuegenParamValuegen_param_value set to 'clutter_border_average'"clutter_border_average""clutter_border_average""clutter_border_average""clutter_border_average""clutter_border_average" results in higher clutter scores even if the match is not located at the border of the image domain.

The use of clutter parameters can be disabled and enabled by calling set_shape_model_paramset_shape_model_paramSetShapeModelParamSetShapeModelParamSetShapeModelParamset_shape_model_param. For newly created shape models, the use of clutter parameters is disabled. After calling set_shape_model_clutterset_shape_model_clutterSetShapeModelClutterSetShapeModelClutterSetShapeModelClutterset_shape_model_clutter, the use of clutter parameters is enabled. Depending on the activation status for the use of clutter parameters, the find operators, e.g., find_shape_modelfind_shape_modelFindShapeModelFindShapeModelFindShapeModelfind_shape_model, expect a different number of entries in the input parameter MinScoreMinScoreMinScoreMinScoreminScoremin_score. The set clutter parameters and the value of 'use_clutter'"use_clutter""use_clutter""use_clutter""use_clutter""use_clutter" can be queried using the operator get_shape_model_clutterget_shape_model_clutterGetShapeModelClutterGetShapeModelClutterGetShapeModelClutterget_shape_model_clutter.

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:

• ModelIDModelIDModelIDModelIDmodelIDmodel_id

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

Parameters

Example (HDevelop)

*
* Create a shape model.
read_image (ImageModel, '/bga_gap/bga_gap_01.png')
gen_circle (ROI, 753.869, 551.624, 28.4027)
reduce_domain (ImageModel, ROI, ImageReduced)
create_aniso_shape_model (ImageReduced, 'auto', rad(0), rad(0), 'auto', \
                          0.95, 1.05, 'auto', 0.95, 1.05, 'auto', 'auto', \
                          'use_polarity', 'auto', 'auto', ModelID)
*
* Specify the clutter parameters.
find_aniso_shape_model (ImageModel, ModelID, rad(0), rad(0), 0.95, 1.05, \
                        0.95, 1.05, 0.83, 0, 0.0, 'least_squares', 0, 0.0, \
                        Row, Column, Angle, ScaleR, ScaleC, Score)
get_hom_mat2d_from_matching_result (Row[0], Column[0], Angle[0], ScaleR[0], \
                                    ScaleC[0], HomMat2D)
*
gen_circle (ROI_0, 700.655, 548.666, 21.6273)
gen_circle (ROI_1_0, 810.655, 550.611, 21.6273)
union2 (ROI_0, ROI_1_0, ClutterRegion)
*
ClutterContrast := 12
*
* Set the clutter parameters into shape model.
set_shape_model_clutter (ClutterRegion, ModelID, HomMat2D, ClutterContrast, \
                         [], [])
*
* Use the shape model to detect objects with a small amount of clutter
read_image (Image,'/bga_gap/bga_gap_02.png')
MaxClutter := 0.09
find_aniso_shape_model (Image, ModelID, rad(0), rad(0), 0.95, 1.05, 0.95, \
                        1.05, [0.83, MaxClutter], 0, 0.0, 'least_squares', \
                        [4, 3],  0.0,  Row, Column, Angle, ScaleR, ScaleC, \
                        Score)
*
* Visualize the matches
dev_display_shape_matching_results (ModelID, ['green', 'red'], Row, Column, \
                                    Angle, ScaleR, ScaleC, 0)
Clutter := Score[|Score|/2:|Score|-1]
Score := Score[0:|Score|/2-1]
dev_inspect_ctrl ([Score, Clutter])

Result

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

Possible Predecessors

create_shape_modelcreate_shape_modelCreateShapeModelCreateShapeModelCreateShapeModelcreate_shape_model, create_scaled_shape_modelcreate_scaled_shape_modelCreateScaledShapeModelCreateScaledShapeModelCreateScaledShapeModelcreate_scaled_shape_model, create_aniso_shape_modelcreate_aniso_shape_modelCreateAnisoShapeModelCreateAnisoShapeModelCreateAnisoShapeModelcreate_aniso_shape_model, create_shape_model_xldcreate_shape_model_xldCreateShapeModelXldCreateShapeModelXldCreateShapeModelXldcreate_shape_model_xld, create_scaled_shape_model_xldcreate_scaled_shape_model_xldCreateScaledShapeModelXldCreateScaledShapeModelXldCreateScaledShapeModelXldcreate_scaled_shape_model_xld, create_aniso_shape_model_xldcreate_aniso_shape_model_xldCreateAnisoShapeModelXldCreateAnisoShapeModelXldCreateAnisoShapeModelXldcreate_aniso_shape_model_xld

Possible Successors

find_shape_modelfind_shape_modelFindShapeModelFindShapeModelFindShapeModelfind_shape_model, find_scaled_shape_modelfind_scaled_shape_modelFindScaledShapeModelFindScaledShapeModelFindScaledShapeModelfind_scaled_shape_model, find_aniso_shape_modelfind_aniso_shape_modelFindAnisoShapeModelFindAnisoShapeModelFindAnisoShapeModelfind_aniso_shape_model, find_shape_modelsfind_shape_modelsFindShapeModelsFindShapeModelsFindShapeModelsfind_shape_models, find_scaled_shape_modelsfind_scaled_shape_modelsFindScaledShapeModelsFindScaledShapeModelsFindScaledShapeModelsfind_scaled_shape_models, find_aniso_shape_modelsfind_aniso_shape_modelsFindAnisoShapeModelsFindAnisoShapeModelsFindAnisoShapeModelsfind_aniso_shape_models, get_shape_model_clutterget_shape_model_clutterGetShapeModelClutterGetShapeModelClutterGetShapeModelClutterget_shape_model_clutter

Alternatives

set_generic_shape_model_paramset_generic_shape_model_paramSetGenericShapeModelParamSetGenericShapeModelParamSetGenericShapeModelParamset_generic_shape_model_param, set_generic_shape_model_objectset_generic_shape_model_objectSetGenericShapeModelObjectSetGenericShapeModelObjectSetGenericShapeModelObjectset_generic_shape_model_object

See also

set_shape_model_paramset_shape_model_paramSetShapeModelParamSetShapeModelParamSetShapeModelParamset_shape_model_param

Module

Matching