get_sampling_window_offset

1 Description
2 Syntax
3 Parameters
4 Return
5 Examples
6 Remark
7 See Also
8 header to Include
9 Reference

Description

Get offset array for sampling window, via center point

Syntax

int get_sampling_window_offset( int * pOffset, int * pXOffSet, int * pYOffSet, int nCols, int nWinSizeX, int nWinSizeY, int nSampling = FILTERSHAPE_SQUARE )

Parameters

pOffset: [modify] array offset, the input size is nWinsizeX*nWinSizeY, output size is the size of real offset data.; NOTE: the col size is the col size of matrix need be filtered instead of window.
pXOffSet: [output] array offset of x axle
pYOffSet: [output] array offset of y axle
nCols: [input] matrix col size need to be filtered
nWinSizeX: [input] window x axle size, must be odd(1, 3, 5,...)
nWinSizeY: [input] window y axle size, must be odd(1, 3, 5,...)
nSampling: [input] can be FILTERSHAPE_SQUARE, FILTERSHAPE_CIRCULAR, FILTERSHAPE_STRAIGHT_CROSS('+'), FILTERSHAPE_DIAGONAL_CROSS('X'); when shape is FILTERSHAPE_CIRCULAR or FILTERSHAPE_DIAGONAL_CROSS nWinSizeX must equal nWinSizeY

Return

size of offset array, return -1 when there is a error.

Examples

EX1

void get_sampling_window_offset_ex1()
{
    int nWinSizeX = 3;
    int nWinSizeY = 3;
    int nSampling = FILTERSHAPE_STRAIGHT_CROSS;
    int nCol = 10; 
    //0 1 0
    //1 1 1
    //0 1 0
    vector<int> vnOffset;
    vector<int> vnXOffSet;
    vector<int> vnYOffSet;
    vnOffset.SetSize(nCol);
    vnXOffSet.SetSize(nWinSizeX);
    vnYOffSet.SetSize(nWinSizeY);
    int nOffset = get_sampling_window_offset(vnOffset, vnXOffSet, vnYOffSet, nCol, nWinSizeX, nWinSizeY, nSampling);
    //return 5(size of real data in pOffset)
    //int vnOffset        =       { -10  0 10 -1  1 }  // ncol = 10
    //int vnXOffSet =     {  0  -1  0 -1  0 }
    //int vnYOffSet =     { -1   0  0  0  1 }
}