Constraints.Constraints (1)
A
set of constraints can be specified, limiting the blobs that are found by
the tool (result validation). The constraints
apply to each blob, and all must be satisfied for a blob to be considered
qualified.
Constraints temporarily disabled -
Check when configuring to quickly see which blobs are filtered out
Contour area -
Area including any holes
Blob area -
Area excluding any holes
Number of holes -
Minimum and maximum number of holes to accept the blob
Note: Blobs with fewer holes than the minimum limit or more
holes than the maximum limit
will
be removed from the results
Size of hole -
A minimum hole area implies that the blob must have a
hole; a maximum area does not.
Note: small holes can be ignored by setting the Hole
filter
Intensity - used to remove blobs with an average intensity
outside the minimum and maximum values
Note: if Calculate blob intensity/std on the
Advanced page is turned off, this will not work
Std intensity - used to remove blobs with an intensity
variations outside the minimum and maximum values
Note: if Calculate blob intensity/std on the
Advanced page is turned off, this will not work
Circularity - Minimum and maximum circularity limits to
accept a blob
Note: A smooth factor of 2 or 3 will normally lead to a better
circularity estimate
Proximity - minimum distance between blobs. You can select to
retain the largest or the smallest of the two
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Constraints.Constraints (2)
Constraints temporarily disabled -
Check when configuring to quickly see which blobs are filtered out
Axis ratio - Minimum and maximum limit values for
axis ratio
Axis ratio is length / width of bounding box.
Angle - Minimum and maximum limit values for angle
Length of bounding box - Minimum and maximum
length limits for bounding box
Width of bounding box - Minimum and maximum width
limits for bounding box
Area of bounding box - Minimum and maximum area limits for bounding box
Length of aligned rectangle - Minimum and maximum
length limits for aligned rectangle
Width of
aligned rectangle - Minimum and maximum
width limits for
aligned rectangle
Area of
aligned rectangle - Minimum and maximum
area limits for
aligned rectangle
Note: An aligned rectangle
is a minimum bounding box that is aligned with the x and
y axes.
Constraints temporarily disabled -
Check when configuring to quickly see which blobs are filtered out
Classification constraints active - check to filter objects by the
Classification limits (below)
Only objects in active classes - if checked, objects classified as
belonging to a deactivated class are removed. If unchecked, objects in
deactivated classes are retained, and not filtered by the classification
limits.
Feature classes/references - define feature classes and add
references
- Define a new feature class
- Delete feature class and all
references
- Add a reference. The Add reference
dialog box opens:
The defined classes are listed in the Class dropdown. Select a class
to add references to. By clicking one of the numbered fields under
Select, the numbered object is highlighted in the main image.
- Click OK to add a single reference and close the add references
box
- Click Add to add a reference and keep the dialog open
- Click Cancel or Close to close the dialog
Show all - overrides classification constraints set,
displaying all objects.
Show classified - show only recognised (classified) objects
Show unclassified - show only unrecognised (unclassified)
objects.
- Remove a selected reference
Class list popup menu
- Add class - same as
- Rename class - set new class name
- Delete class - same as
- Delete all classes - empty all lists
- Copy all classes - copy all classes with references to the
clipboard. Useful for moving definitions between tool instances
- Paste (replace all classes) - replaces all class definitions with
contents on the clipboard
Note that these operations cannot be undone.
Reference list popup menu
- Add reference - same as
- Rename reference - set new reference name
- Edit reference - bring up a dialog for manual editing of the
reference's details
- Delete reference - same as
- Delete all references - empty the reference list for the selected
class
Note that these operations cannot be undone.
Classification limits - Used to filter objects when Classification constraints active is checked.
Max distance - max accepted distance limit to reference
Min separation (dB) - min accepted separation between best and
second-best match
Weights - a number of object properties can be selected to be used
in the classification. Each property has an associated function and a
weight.
Check each property that is to be included
Automatic weight calculation -
- Checked: always keep the weights updated when references
are added or deleted. Select the calculation function from the
drop-down box [1/(max-min), 1/Std, 1/(3*Std) or 1).
- Unchecked: weights can be set individually (below). Click
the
button to calculate all
weights with the function selected in the drop-down box - useful as
a starting point.
To set a relative weight manually you must uncheck Automatic weight calculation;
weights can then be entered in the edit fields.
Functions and static values -
Pressing the
button
for a feature brings up this dialog:
Function - a normalising function can be applied to the
property value prior to weighing. Reasonable defaults are set for new
tools.
- None
- Square root - x^(1/2)
- Cube root - x^(1/3)
- Square - x^2
- Cube - x^3
Static - A static value can be used in the
classification, overriding the individual references' feature values.
Check the Static checkbox and enter the static value. The
button is changed to
as a reminder.
Include in description -
Classification
results can be displayed next to the class name in the image. Useful for
deciding the classification limit values
- Index - object number
- Name - class name, if any
- Distance - classification distance
- Separation - classification separation (dB)
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