Retrieve mean object size for classes

dhavas · May 2016

HI all,

I found this code to retrieve the number of objects within two classes - I need the number and the mean obj size and locate to global vars (for module).

However, the code works fine, but I cannot define a condition in which I can retrieve for each class separately:

This script basically works

Public Sub PrintClassStats()

        Dim im As McImage=ThisApplication.ActiveImage
        If im Is Nothing Then Exit Sub 'no image
        Dim md As McMMData=im.MeasurementsData
        If md.Count=0 Then Exit Sub'no data
        Dim classes As MMClasses=McMeasurements.ThisAddin.Options.Classes
        Dim nClasses As Integer=classes.Items.Count


        
        For Each cl As MMClassDescr In classes.Items.Values
            'get count of objects of this class
            Dim nObj As Integer=0
            For Each sf As McMMSubFeature In md.SubFeatures
                If sf.Value(eMeasures.AnyClass)=cl.Value Then nObj+=1
            Next

           Debug.Print "Class name = " & cl.DisplayName & ", Number of Objects = " & nObj.ToString

        Next
    End Sub

Here my try, whereas second condition (else) is never met:

 Public Sub PrintClassStats()


        Dim im As McImage=ThisApplication.ActiveImage
        If im Is Nothing Then Exit Sub 'no image
        Dim md As McMMData=im.MeasurementsData
        If md.Count=0 Then Exit Sub'no data
        Dim classes As MMClasses=McMeasurements.ThisAddin.Options.Classes
        Dim nClasses As Integer=classes.Items.Count
'those should be globals
Dim area1, area2, countCl1, countCl2

For Each cl As MMClassDescr In classes.Items.Values 'get count of objects of this class Dim nObj As Integer=0 For Each sf As McMMSubFeature In md.SubFeatures If sf.Value(eMeasures.AnyClass)=cl.Value Then nObj+=1 Next If cl.Value = 1 Then ' also tried 0, cl.description = "Class 1" etc. countCl1 = nObj Else ' no matter what I DO HERE - CONDITION IS NEVER MET countCl2 = nObj End If Debug.Print "Class name = " & cl.DisplayName & ", Number of Objects = " & nObj.ToString Debug.Print "count1 = " & countCl1.ToString Debug.Print "count2 = " & countCl2.ToString Next End Sub

Last but not least no idea how to retrieve the info for mean object size.
I tried this one:

area1 = sf.Value(eMeasures.RgnArea)


I'm sure you can check very quickly, while I can't find a way how to do right. 

Thx
Daniel

YuriG · May 2016

Hi Daniel,

Your macro had some issues with array definitions and the loop entry. Here is the modified version that works:

Public Sub PrintClassStats()

        Dim im As McImage=ThisApplication.ActiveImage
        If im Is Nothing Then Exit Sub 'no image
        Dim md As McMMData=im.MeasurementsData
        If md.Count=0 Then Exit Sub'no data
        Dim classes As MMClasses=McMeasurements.ThisAddin.Options.Classes
        Dim nClasses As Integer=classes.Items.Count
        Dim count As Integer()
        Dim area As Double()

        ReDim count(nClasses)
        ReDim area(nClasses)
        Debug.Clear

        'Debug.Print "Number of classes = " & nClasses.ToString
        For Each cl As MMClassDescr In classes.Items.Values
            'get count of objects of this class
            For Each sf As McMMSubFeature In md.SubFeatures
                If sf.Value(eMeasures.AnyClass)=cl.Value Then
                    'sum Objects
                    count(cl.value-1) += 1
                    'sum Area
                    area(cl.value-1) += sf.Value(eMeasures.RgnArea)
                End If
            Next
            'get Average Area
            If count(cl.value-1)>0 Then
                area(cl.value-1)=area(cl.value-1)/count(cl.value-1)
            End If
            'check Stats
            Debug.Print "Class name = " & cl.DisplayName & ", Number of Objects = " & count(cl.value-1).ToString & ", Area(mean) = " & area(cl.value-1).ToString

        Next
    End Sub

Yuri

YuriG · May 2016

Hi Daniel,

Class states can be directly reported in the measurement table by grouping "By Class" or in the Data Collector in the "Measurements Class Stats" table.

If you want to retrieve it in the code, here is the modified macro:

    Public Sub PrintClassStats()
        Dim im As McImage=ThisApplication.ActiveImage
        If im Is Nothing Then Exit Sub 'no image
        Dim md As McMMData=im.MeasurementsData
        If md.Count=0 Then Exit Sub'no data
        Dim classes As MMClasses=McMeasurements.ThisAddin.Options.Classes
        Dim nClasses As Integer=classes.Items.Count

        For Each cl As MMClassDescr In classes.Items.Values
            'get count of objects of this class
            Dim nObj As Integer=0
            Dim area As Double=0
            For Each sf As McMMSubFeature In md.SubFeatures
                If sf.Value(eMeasures.AnyClass)=cl.Value Then
                    nObj+=1
                    area+=sf.Value(eMeasures.RgnArea)
                End If
            Next
            Debug.Print(String.Format("Class name = {0}, Number of Objects = {1}, Average Area = {2}", cl.DisplayName,nObj,IIf(nObj=0,0,area/nObj)))
        Next
    End Sub

Regards,

Yuri

dhavas · May 2016

Hi all,

I already resolved the issue, at least for the count:

This code works for number of objects, but not yet for mean size.

Public Sub PrintClassStats()

        Dim im As McImage=ThisApplication.ActiveImage
        If im Is Nothing Then Exit Sub 'no image
        Dim md As McMMData=im.MeasurementsData
        If md.Count=0 Then Exit Sub'no data
        Dim classes As MMClasses=McMeasurements.ThisAddin.Options.Classes
        Dim nClasses As Integer=classes.Items.Count
Dim area1, area2,count, area

ReDim count(nClasses) As Double
ReDim area(nClasses) As Double
Debug.Clear

        'Debug.Print "Number of classes = " & nClasses.ToString
        For Each cl As MMClassDescr In classes.Items.Values
            'get count of objects of this class
            Dim nObj As Integer=0
            For Each sf As McMMSubFeature In md.SubFeatures
                If sf.Value(eMeasures.AnyClass)=cl.Value Then nObj+=1
                Debug.Print sf.Value(eMeasures.RgnArea)
            Next

            count(cl.value-1) = nObj

            area(cl.value-1) = sf.Value(eMeasures.RgnArea)

           Debug.Print "Class name = " & cl.DisplayName & ", Number of Objects = " & nObj.ToString

Debug.Print count(0)
Debug.Print count(1)

Debug.Print area(0)
Debug.Print area(1)



        Next
    End Sub

dhavas · May 2016

Hi all,

Sorry to have bothered, but think I have resolved it now totally :-0. Here the code that seems to work:

Public Sub PrintClassStats()

        Dim im As McImage=ThisApplication.ActiveImage
        If im Is Nothing Then Exit Sub 'no image
        Dim md As McMMData=im.MeasurementsData
        If md.Count=0 Then Exit Sub'no data
        Dim classes As MMClasses=McMeasurements.ThisAddin.Options.Classes
        Dim nClasses As Integer=classes.Items.Count

Dim count, area
Dim AreaSum As Double = 0

'later set to globals Dim areaCl1, areaCl2, OD1, OD2, CountCl1, CountCl2 ReDim count(nClasses) As Double ReDim area(nClasses) As Double Debug.Clear 'Debug.Print "Number of classes = " & nClasses.ToString For Each cl As MMClassDescr In classes.Items.Values 'get count of objects of this class Dim nObj As Integer=0 For Each sf As McMMSubFeature In md.SubFeatures If sf.Value(eMeasures.AnyClass)=cl.Value Then nObj+=1 If sf.Value(eMeasures.AnyClass)=cl.Value Then AreaSum = AreaSum + sf.value(eMeasures.RgnArea) Next count(cl.value-1) = nObj area(cl.value-1) = AreaSum Debug.Print "Class name = " & cl.DisplayName & ", Number of Objects = " & nObj.ToString Debug.Print count(0) Debug.Print count(1) Debug.Print area(0) Debug.Print area(1) Next CountCl1 = count(0) CountCl2 = count(1) areaCl1 = area(0) areaCl1 = area(1) - area(0) OD1 = CountCl1/areaCl1 OD2 = CountCl2/areaCl2 End Sub

dhavas · May 2016

thx

Retrieve mean object size for classes

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