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Im using the latentsvm detector api for object detection, but I need to show part filter boxes for the object, I found there is a not official api function source code (showPartFilterBoxes) in the objdetect src folder,but how to use it? I could not find any instruction from web, thanks advance!

this is the function:

/*
// Drawing part filter boxes
//
// API
// int showPartFilterBoxes(const IplImage *image,
                           const filterObject *filter,
                           CvPoint *points, int *levels, int kPoints,
                           CvScalar color, int thickness,
                           int line_type, int shift);
// INPUT
// image             - initial image
// filters           - a set of part filters
// n                 - number of part filters
// partsDisplacement - a set of points
// levels            - levels of feature pyramid
// kPoints           - number of foot filter positions
// color             - line color for each box
// thickness         - line thickness
// line_type         - line type
// shift             - shift
// OUTPUT
// window contained initial image and filter boxes
// RESULT
// Error status
*/
int showPartFilterBoxes(IplImage *image,
                        const CvLSVMFilterObject **filters,
                        int n, CvPoint **partsDisplacement,
                        int *levels, int kPoints,
                        CvScalar color, int thickness,
                        int line_type, int shift)
{
    int i, j;
    float step;
    CvPoint oppositePoint;

    step = powf( 2.0f, 1.0f / ((float)LAMBDA));

    for (i = 0; i < kPoints; i++)
    {
        for (j = 0; j < n; j++)
        {
            // Drawing rectangles for part filters
            getOppositePoint(partsDisplacement[i][j],
                             filters[j + 1]->sizeX, filters[j + 1]->sizeY,
                             step, levels[i] - 2 * LAMBDA, &oppositePoint);
            cvRectangle(image, partsDisplacement[i][j], oppositePoint,
                        color, thickness, line_type, shift);
        }
    }
#ifdef HAVE_OPENCV_HIGHGUI
    cvShowImage("Initial image", image);
#endif
    return LATENT_SVM_OK;
}