cmask2polygons

Convert Color label mask to Polygons per class

Install

$ pip install cmask2polygons

How to Use

from cmask2polygons import get_polygons_per_class


color_mask_path = '. . .'
color_mask = cv2.cvtColor(cv2.imread(color_mask_path), cv2.COLOR_BGR2RGB)

# Key:str, Val:tuple
cls_color_map = {
    "class_name_1": (125, 125, 125),  # RGB Color
    "class_name_2": (70, 20, 225),
    . . .
}

# Get Polygons from Color Label Mask
polygons_per_class = get_polygons_per_class(
    color_mask=color_mask,
    cls_color_map=cls_color_map,
    min_area=100.0,
    epsilon_param=8e-4,
    pt_type=int,
    add_closept=False,
)

Arguments

• color_mask: RGB Image (numpy.ndarray)
• cls_color_map: Color Value per Class (dict)
• min_area: Minimum area of object (float). Default is 100.0
• epsilon_param: Value for polygon approximating (float). Default is 8e-4
• pt_type: Data type of points. Default is int
• add_closept: Append end point (== start point) for representing closed. Default is False

Return

• Data type: dict
  • Key: Class name (str)
  • Value: list of polygon x (pt_type), y (pt_type) coordinates