Граничные режимы в scipy.ndimage.laplace

Я немного копался в исходном коде scipy. То, что я нашел, заставляет меня думать, что добавить свой пользовательский режим будет нелегко.

Режим, на который вы ссылаетесь, управляется глубоко в базовом C-коде. Вам нужно будет изменить значение C enum, обновить исходный файл, создать новый пакет.

Смотрите здесь Цитирование:

/* Extend a line in memory to implement boundary conditions: */
int NI_ExtendLine(double *buffer, npy_intp line_length,
                  npy_intp size_before, npy_intp size_after,
                  NI_ExtendMode extend_mode, double extend_value)
{
    double *first = buffer + size_before;
    double *last = first + line_length;
    double *src, *dst, val;

    switch (extend_mode) {
        /* aaaaaaaa|abcd|dddddddd */
        case NI_EXTEND_NEAREST:
            src = first;
            dst = buffer;
            val = *src;
            while (size_before--) {
                *dst++ = val;
            }
            src = last - 1;
            dst = last;
            val = *src;
            while (size_after--) {
                *dst++ = val;
            }
            break;
        /* abcdabcd|abcd|abcdabcd */
        case NI_EXTEND_WRAP:
            src = last - 1;
            dst = first - 1;
            while (size_before--) {
                *dst-- = *src--;
            }
            src = first;
            dst = last;
            while (size_after--) {
                *dst++ = *src++;
            }
            break;
        /* abcddcba|abcd|dcbaabcd */
        case NI_EXTEND_REFLECT:
            src = first;
            dst = first - 1;
            while (size_before && src < last) {
                *dst-- = *src++;
                --size_before;
            }
            src = last - 1;
            while (size_before--) {
                *dst-- = *src--;
            }
            src = last - 1;
            dst = last;
            while (size_after && src >= first) {
                *dst++ = *src--;
                --size_after;
            }
            src = first;
            while (size_after--) {
                *dst++ = *src++;
            }
            break;
        /* cbabcdcb|abcd|cbabcdcb */
        case NI_EXTEND_MIRROR:
            src = first + 1;
            dst = first - 1;
            while (size_before && src < last) {
                *dst-- = *src++;
                --size_before;
            }
            src = last - 2;
            while (size_before--) {
                *dst-- = *src--;
            }
            src = last - 2;
            dst = last;
            while (size_after && src >= first) {
                *dst++ = *src--;
                --size_after;
            }
            src = first + 1;
            while (size_after--) {
                *dst++ = *src++;
            }
            break;
        /* kkkkkkkk|abcd]kkkkkkkk */
        case NI_EXTEND_CONSTANT:
            val = extend_value;
            dst = buffer;
            while (size_before--) {
                *dst++ = val;
            }
            dst = last;
            while (size_after--) {
                *dst++ = val;
            }
            break;
        default:
            PyErr_Format(PyExc_RuntimeError,
                         "mode %d not supported", extend_mode);
            return 0;
    }
    return 1;
}