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Global functions for RecGenConv2dK1d

General structure of the implementation:

• HxFuncRecGenConv2dK1d_variation does the image by calling:
• HxFuncRecGenConv2dK1d_Line_variation does a line of the image by calling:
• HxFuncRecGenConv2dK1d_Pix_variation does the neighbourhood of one pixel

Schematically:

HxFuncRecGenConv2dK1d_XdirSim  -->  _Line_XdirSim
HxFuncRecGenConv2dK1d_YdirSim  -->  _Line_YdirSim

HxFuncRecGenConv2dK1d_YdirBuf  -->  _Line_YdirBuf
                                \>  _Line_YdirBufAnti

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