如何获得矩阵中由1个以上其他黑色像素连接的黑色像素的数量(计数或总和)？

def count_connected_black_pixels(matrix):
    rows = len(matrix)
    cols = len(matrix[0])
    visited = [[False] * cols for _ in range(rows)]
    count = 0

    def dfs(row, col):
        if row < 0 or row >= rows or col < 0 or col >= cols:
            return
        if visited[row][col] or matrix[row][col] != 1:
            return
        visited[row][col] = True
        nonlocal count
        count += 1
        dfs(row - 1, col)  # 上
        dfs(row + 1, col)  # 下
        dfs(row, col - 1)  # 左
        dfs(row, col + 1)  # 右

    for i in range(rows):
        for j in range(cols):
            if not visited[i][j] and matrix[i][j] == 1:
                dfs(i, j)

    return count