Function RoiRect

jni/stasm/faceroi.cpp:21–56

// ASM search, but also ensuring that the rect is in the image boundaries.

static Rect RoiRect(
    const DetectorParameter& detpar,    // in
    int           nimgcols,  // in
    int           nimgrows,  // in
    bool          flip,      // in: mirror the ROI
    double        botfrac,   // in: distance from center to bottom marg
    double        leftfrac,  // in: dist from center to left marg
    double        topfrac,   // in
    double        rightfrac) // in
{
    int ixmin, ixmax;
    if (flip)
    {
        ixmin = MAX(0,        cvRound(detpar.x - rightfrac * detpar.width));
        ixmax = MIN(nimgcols, cvRound(detpar.x + leftfrac  * detpar.width));
    }
    else
    {
        ixmin = MAX(0,        cvRound(detpar.x - leftfrac  * detpar.width));
        ixmax = MIN(nimgcols, cvRound(detpar.x + rightfrac * detpar.width));
    }
    const int iymin = MAX(0,        cvRound(detpar.y - botfrac   * detpar.height));
    const int iymax = MIN(nimgrows, cvRound(detpar.y + topfrac   * detpar.height));

    Rect roi;

    roi.x = ixmin;
    roi.y = iymin;
    roi.width  = ixmax - ixmin;
    roi.height = iymax - iymin;

    CV_Assert(roi.width > 0);
    CV_Assert(roi.height > 0);

    return roi;
}

static bool IsRoiEntireImg(
    const Rect& roi,        // in