Function MouthInnerRect

jni/stasm/eyedet.cpp:493–540

// it's better to not find a mouth than to find an incorrect mouth.

static Rect MouthInnerRect(
    const Rect&     facerect,    // in
    EYAW            eyaw,        // in
    int             ileft_best,  // in: index of best left eye, -1 if none
    int             iright_best, // in: index of best right eye, -1 if none
    const vec_Rect& leyes,       // in: left eyes found by eye detector
    const vec_Rect& reyes)       // in: right eyes found by eye detector
{
    Rect rect = facerect;
    double width = (eyaw == EYAW00? .12: .20) * facerect.width;
    double height = .30 * facerect.height;

    int ixshift, iyshift;
    MouthRectShift(ixshift, iyshift,
                   eyaw, facerect.width, facerect.height,
                   ileft_best, iright_best, leyes, reyes);

    rect.x += cvRound(.50 * (facerect.width - width)) + ixshift;

    rect.width  =  cvRound(width);

    switch (eyaw)
    {
    case EYAW00: // frontal model
        rect.y += cvRound(.7 * facerect.height);
        break;
    case EYAW_45: // left facing three-quarter model
        rect.y += cvRound(.65 * facerect.height);
        break;
    case EYAW_22: // left facing three-quarter model
        rect.y += cvRound(.65 * facerect.height);
        break;
    case EYAW22: // right facing three-quarter model
        rect.y += cvRound(.65 * facerect.height);
        break;
    case EYAW45: // right facing three-quarter model
        rect.y += cvRound(.65 * facerect.height);
        break;
    default:
        Err("MouthInnerRect: Invalid eyaw %d", eyaw);
        break;
    }
    rect.y += iyshift;
    rect.height = cvRound(height);
    rect.width  = MAX(0, rect.width);
    rect.height = MAX(0, rect.height);
    return rect;
}

// The OpenCV mouth detector biases the position of the mouth downward (wrt the
// center of the mouth determined by manual landmarking).  Correct that here.