ImagePro>Re: Ferret (min) vs. Size (width) Why do these give me different results?

["Kevin Ryan" <kevin[at]mediacy.com>]

Minor note: the default number of ferets is 32, with a maximum of 90. This
is set or retrieved using BLBCMD_SETNUMANGLES, as in the following example.

-- Kevin Ryan
kevin@mediacy.com

' First, declare the BlbControl Hail function.
Declare Function BlbControl Lib "HALBLB32.DLL" (ByVal hbl As Integer, ByVal
Command As Integer, ByVal sparam As Integer, ByVal lparam As Long, pparam As
Any) As Long

' These constants are also defined in Hail.Bas, part of the SDK.
' If you include Hail.bas, these constants and the BlbControl definition
will be duplicated.
Const BLBCMD_GETNUMANGLES = 26
Const BLBCMD_SETNUMANGLES = 27

' Set or get the number of ferrets
Function BlbFerret(ferret As Integer, bSet As Integer) As Integer

	Dim hbl As Integer
	Dim lRet As Long
	Dim testResult As Integer

	ret = IpBlbGet(GETHBLOB,0,0,hbl)

	If bSet = 0 Then
		' Obtain the range
		lRet = BlbControl(hbl, BLBCMD_GETNUMANGLES, 0, 0, ferret)
	Else
		' Set the number of ferrets, valid values are 1-90
		lRet = BlbControl(hbl, BLBCMD_SETNUMANGLES, ferret, 0, IPNULL)
	End If

	If lRet <> 0 Then
		BlbFerret = lRet
	Else
		BlbFerret = ferret
	End If
End Function

Sub testFerret()
	Dim ferCount As Integer

	ferCount = 0
	Debug.Print BlbFerret(ferCount, 0)

	ferCount = 75
	Debug.Print BlbFerret(ferCount, 1)

End Sub


> -----Original Message-----
> From: Image-Pro Plus Users Email List
> [mailto:imagepro-users@lists.mediacy.com]On Behalf Of Kevin Ryan
> Sent: Thursday, December 20, 2001 4:41 PM
> To: Image-Pro Plus Users Email List
> Subject: ImagePro>Re: Ferret (min) vs. Size (width) Why do these give me
> different results?
>
>
> Size (width) is the feret along the axis of the equivalent ellipse, while
> Feret (min) is the minimum feret at any angle.
>
> These will, in general, not be identical unless the object is symmetric
> around the major and minor axes. Generally the Feret (min) will
> be smaller -
> however, since the Size (width) causes an additional feret to be
> calculated
> at the minor axis angle (over and above the up to 90 calculated
> in the Feret
> (min) calculation), it may find one _slightly_ smaller.
>
> -- Kevin Ryan
> kevin@mediacy.com
>
> > -----Original Message-----
> > From: Image-Pro Plus Users Email List
> > [mailto:imagepro-users@lists.mediacy.com]On Behalf Of Simons, Nancy
> > Sent: Thursday, December 20, 2001 4:16 PM
> > To: Image-Pro Plus Users Email List
> > Subject: ImagePro>Ferret (min) vs. Size (width) Why do these give me
> > different results?
> >
> >
> > Can someone explain to me why Ferret (min) vs. Size (width)
> don't give the
> > same results?
> > Nancy Simons
> > Molecular Interventions
> > Boston Scientific Corp.
> > One Boston Scientific Place 4A
> > Natick, MA 01760-1537


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