[
    {
        "h_min": 1,
        "h_max": 10,
        "w_min": 1,
        "w_max": 10,
        "max_black": 5
    },
    {
        "h_min": 3,
        "h_max": 15,
        "w_min": 3,
        "w_max": 15,
        "max_black": 8
    },
    {
        "h_min": 1,
        "h_max": 20,
        "w_min": 1,
        "w_max": 20,
        "max_black": 10
    },
    {
        "h_min": 5,
        "h_max": 15,
        "w_min": 5,
        "w_max": 15,
        "max_black": 7
    }
]