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Global functions for GenConv2dSep

General structure of the implementation:

• HxFuncGenConv2dSep_variation does the image by calling:
• HxFuncGenConv2dSep_Line_variation does a line of the image by calling:
• HxFuncGenConv2dSep_Pix_variation does the neighbourhood of one pixel

Schematically:

vType == 0:
HxFuncGenConv2dSep_Sim  -->  _Line_XdirInc
                         \>  _Line_YdirNaiInc

vType == 1:
HxFuncGenConv2dSep_Sim  -->  _Line_Xdir     -->  _Pix_Xdir
                         \>  _Line_YdirSim  -->  _Pix_Ydir

vType == 2:
HxFuncGenConv2dSep_Sim  -->  _Line_XdirInc
                         \>  _Line_YdirSimInc

vType == 3:
HxFuncGenConv2dSep_Hor  -->  _Line_Xdir     -->  _Pix_Xdir
                         \>  _Line_YdirHor  -->  _Pix_Ydir

vType == 4:
HxFuncGenConv2dSep_Hor  -->  _Line_XdirInc
                         \>  _Line_YdirHorInc

vType == 5:
HxFuncGenConv2dSep_Ver  -->  _Line_XdirVerInc
                         \>  _Line_YdirVerInc

vType == 6:
HxFuncGenConv2dSep_VerCyc  -->  _Line_XdirVerInc
                            \>  _Line_XYdirVerCycInc

vType == 7:
HxFuncGenConv2dSep_Min  -->  _Line_XYdirMinInc

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