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Global functions for KernelNgbOp2d

General structure of the implementation:

• HxFuncKernelNgbOp2dDispatch does the image by calling:
• HxFuncKernelNgbOp2d_Row(variation) does a row of the image by calling:
• HxFuncKernelNgbOp2d_Pix_variation does the neighbourhood of one pixel

Schematically:

HxFuncKernelNgbOp2dDispatch  -->  _Row(P1,Loop)  -->  _Pix_P1Loop
                             |                    /
                             +->  _Row(P2,Loop)  -->  _Pix_P2Loop
                             |
                             +->  _Row(PN,Loop)  -->  _Pix_P1Loop

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