Function pixIntersectionOfMorphOps

deps/leptonica/src/morphapp.c:554–596

! * \brief pixIntersectionOfMorphOps() * * \param[in] pixs binary * \param[in] sela * \param[in] type L_MORPH_DILATE, etc. * \return pixd intersection of the specified morphological operation * on pixs for each Sel in the Sela, or NULL on error */

 *                    on pixs for each Sel in the Sela, or NULL on error
 */
PIX *
pixIntersectionOfMorphOps(PIX     *pixs,
                          SELA    *sela,
                          l_int32  type)
{
l_int32  n, i;
PIX     *pixt, *pixd;
SEL     *sel;

    PROCNAME("pixIntersectionOfMorphOps");

    if (!pixs || pixGetDepth(pixs) != 1)
        return (PIX *)ERROR_PTR("pixs undefined or not 1 bpp", procName, NULL);
    if (!sela)
        return (PIX *)ERROR_PTR("sela not defined", procName, NULL);
    n = selaGetCount(sela);
    if (n == 0)
        return (PIX *)ERROR_PTR("no sels in sela", procName, NULL);
    if (type != L_MORPH_DILATE && type != L_MORPH_ERODE &&
        type != L_MORPH_OPEN && type != L_MORPH_CLOSE &&
        type != L_MORPH_HMT)
        return (PIX *)ERROR_PTR("invalid type", procName, NULL);

    pixd = pixCreateTemplate(pixs);
    pixSetAll(pixd);
    for (i = 0; i < n; i++) {
        sel = selaGetSel(sela, i);
        if (type == L_MORPH_DILATE)
            pixt = pixDilate(NULL, pixs, sel);
        else if (type == L_MORPH_ERODE)
            pixt = pixErode(NULL, pixs, sel);
        else if (type == L_MORPH_OPEN)
            pixt = pixOpen(NULL, pixs, sel);
        else if (type == L_MORPH_CLOSE)
            pixt = pixClose(NULL, pixs, sel);
        else  /* type == L_MORPH_HMT */
            pixt = pixHMT(NULL, pixs, sel);
        pixAnd(pixd, pixd, pixt);
        pixDestroy(&pixt);
    }

    return pixd;
}