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TextureMatcher - 53
The TextureMatcher finds the nearest matching texture among a set of reference images. The distance measure is based on frequency information in two directions. 

A texture is given a name. To each texture multiple reference images is associated to improve matching performance.

The tool is suitable for the following applications:

  • Surface Classification
  • Object Identification

Typical task for texture matching is matching images like:

Texture Matching is used and very powerful when it is impossible to extract physical features from the image.

References

Reference - Reference system selection

ROI - the tool's region of interest

  • Center-x - center x of the ROI
  • Center-y - center y of the ROI
  • dX, dY - Width and height of the search area

Point & Click Clipboard Support

The rectangular ROI is defined by four points.


 One point will change the center point.

More on Image Operations.

Textures 

  • Show best reference - You can choose to show the best reference to a texture image. It is updated while running the inspection in the Selected reference image pane.
  • - Adds texture with a given name
  • - Removes a texture including all reference images
  • - Adds a reference to the selected texture - see also "Adding references using Point & click"
  • - Removes the selected reference
  • Current Image - Image is updated when an inspection is performed - the image region is transferred from the captured image
  • Selected Reference - displays the image of the best or selected reference
  • Status bar
    • Best - name of color
    • Dist - Distance of best match
    • Sep - logarithmic separation between best texture and second best texture

Reference Mouse Menu

The following items are available in the reference list mouse menu:

  • Add Reference

  • Delete Reference

  • Rename Reference

  • Delete All References

Adding references using Point & Click

 

By adding a point to the clipboard selecting the a named texture pressing   will add a reference image to the tool - a rectangle defined by four points  is also supported.


Classification

Image decimation

  • Active - activates image decimation

  • Horizontal - horizontal decimation factor

  • Vertical - vertical decimation factor

Note - Image decimation speeds up the TextureMatcher - it is by default off

Normalizing - used to make the texture matcher less sensitive to intensity variations

  • Method

    • 1-Offset - default

    • 2-Offset and mean-gain

    • 3-Offset and std-gain

Features distance - specifies how to calculate the distance - difference is the best method

  • Method

    • 1-Difference

    • 2-Symmetrical difference - default

    • 3-Similarity without weights

    • 4-Similarity

  • Active coefficients

    • By default all coeffisient except LL is included - to deviate from default one verify the performance on a large image set

Constraints - to specify an absolute criteria to accept a texture

  • Maximum distance - the maximum distance from the best reference image

  • Minimum separation - the minimum logarithmic separation between the best and the second best texture


Features

Textures sorted by feature distance - The textures are here sorted after feature distance, thus you can see the best match. Reference not meeting the constraints are display with a yellow checkmark.


Visualisation

Center

Center position of ROI

ROI Region of interest


Results

Match

True if a color is matched - meeting the constraints requirement
Texture Name of matched texture
Reference Name of matching reference
Distance Distance between image and best reference
Separation The logarithmic separation between matched texture and the second best texture
Coefficients Values for the active coefficients
Weights Values for the weights
Texture[] Matching sequence
Distance[] Distance for each texture to current image


ExecuteCmd support - more information

Command

Parameters

Return values

Comments

Set Object=ROI;Value=<polygon>
Object=ROI;Value=cx,cy,dx,dy		 ok,res
ok,res		 Sets the tool's ROI. See Copy/paste ROIs for details.
Get Object=ROI ok,<polygon> Current ROI as rectangular, closed polygon
Set

Object=Reference;Texture=<texture>;
[ Name=<name>;][Code=<code>;]
Value=<polygon>

 ok,None Creates or replaces named texture reference. The polygon defines the reference's position in the image. Name and Code are optional
Get Object=Texturenames ok,<names> All texture names as a Python tuple
Get Object=Referencenames;Texture=<texture> ok,<names> All reference names defined for the named texture
Delete Object=Texture;Name=<name> ok,None Removes named texture and all its references
Delete Object=Reference;Texture=<texture>;
Name=<name>		 ok,None Deletes specified texture reference
DeleteAll Object=Texture;Texture=<texture>; ok,None Deletes specified texture references
DeleteAll - ok,None Deletes all textures and references


Example script - TextureMatcher Classification

# read the results from the texturemacther

type = GetValue('TextureMatcher.Texture')
print type
match = GetValue('TextureMatcher.Match')
print match

#classifies a set of LogicTool based on the result
SetValue('Smooth.Value',type=='Smooth')
SetValue('Tree.Value',type=='Tree')
SetValue('Structure.Value',type=='Structure')
SetValue('Pattern.Value',type=='Pattern')
SetValue('Backside.Value',type=='Backside')
 

 Scorpion Vision Software Version: 9.1.0.504 - Date: 20120104
Scorpion Vision Software® is a registered trademark of Tordivel AS.
Copyright © 2000 - 2012 Tordivel AS.