Function kernelNormalize

deps/leptonica/src/kernel.c:409–440

----------------------------------------------------------------------* * Normalize/Invert * *----------------------------------------------------------------------*/ ! * \brief kernelNormalize() * * \param[in] kels source kel, to be normalized * \param[in] normsum desired sum of elements in keld * \return keld normalized version

 * </pre>
 */
L_KERNEL *
kernelNormalize(L_KERNEL  *kels,
                l_float32  normsum)
{
l_int32    i, j, sx, sy, cx, cy;
l_float32  sum, factor;
L_KERNEL  *keld;

    PROCNAME("kernelNormalize");

    if (!kels)
        return (L_KERNEL *)ERROR_PTR("kels not defined", procName, NULL);

    kernelGetSum(kels, &sum);
    if (L_ABS(sum) < 0.00001) {
        L_WARNING("null sum; not normalizing; returning a copy\n", procName);
        return kernelCopy(kels);
    }

    kernelGetParameters(kels, &sy, &sx, &cy, &cx);
    if ((keld = kernelCreate(sy, sx)) == NULL)
        return (L_KERNEL *)ERROR_PTR("keld not made", procName, NULL);
    keld->cy = cy;
    keld->cx = cx;

    factor = normsum / sum;
    for (i = 0; i < sy; i++)
        for (j = 0; j < sx; j++)
            keld->data[i][j] = factor * kels->data[i][j];

    return keld;
}


/*!