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Global functions for GenConv2dK1d

General structure of the implementation:

• HxFuncGenConv2dK1d_variation does the image by calling:
• HxFuncGenConv2dK1d_Line_variation does a line of the image by calling:
• HxFuncGenConv2dK1d_Pix_variation does the neighbourhood of one pixel

Schematically:

HxFuncGenConv2dK1d_XdirSim  -->  _Line_XdirSim
HxFuncGenConv2dK1d_YdirSim  -->  _Line_YdirSim

HxFuncGenConv2dK1d_XdirInp  -->  _Im_XdirInp  -->  _Line_XdirInp
HxFuncGenConv2dK1d_YdirInp  -->  _Im_YdirInp  -->  _Line_YdirInp

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