# Copyright 2022 AI Singapore
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
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"""Counts the number of detected objects within a boundary."""
from typing import Any, Dict, List, Union
from peekingduck.pipeline.nodes.abstract_node import AbstractNode
from peekingduck.pipeline.nodes.dabble.zoningv1.zone import Zone
[docs]class Node(AbstractNode):
"""Uses the bottom midpoints of all detected bounding boxes and outputs the
number of object counts in each specified zone.
Given the bottom mid-points of all detected objects, this node checks if
the points fall within the area of the specified zones. The zone counting
detections depend on the configuration set in the object detection models,
such as the type of object to detect.
Inputs:
|btm_midpoint_data|
Outputs:
|zones_data|
|zone_count_data|
Configs:
resolution (:obj:`List[int]`): **default = [1280, 720]**. |br|
Resolution of input array to calculate pixel coordinates of zone
points.
zones (:obj:`List[List[List[Union[int, float]]]]`): |br|
**default = [** |br|
|tab| **[[0, 0], [640, 0], [640, 720], [0, 720]],** |br|
|tab| **[[0.5, 0], [1, 0], [1, 1], [0.5, 1]]** |br|
**]** |br|
Used for creation of specific zones with either the absolute pixel
values or % of resolution as a fraction between [0, 1].
"""
def __init__(self, config: Dict[str, Any] = None, **kwargs: Any) -> None:
super().__init__(config, node_path=__name__, **kwargs)
self.zones = [self._create_zone(zone) for zone in self.zones] # type: ignore
def run(self, inputs: Dict[str, Any]) -> Dict[str, Any]:
"""Counts all detected objects that falls within any specified zone,
and return the total object count in each zone.
"""
zone_counts = [0] * len(self.zones)
# for each x, y point, check if it is in any zone and add count
for point in inputs["btm_midpoint"]:
for i, zone in enumerate(self.zones):
if zone.contains(point):
zone_counts[i] += 1
return {
"zones": [zone.polygon_points for zone in self.zones],
"zone_count": zone_counts,
}
def _create_zone(self, zone: List[List[Union[float, int]]]) -> Zone:
"""Creates the appropriate Zone given either the absolute pixel values
or % of resolution as a fraction between [0, 1].
"""
if all(all(0 <= i <= 1 for i in coords) for coords in zone):
# coordinates are in fraction. Use resolution to get correct coords
zone_points = [
self._get_pixel_coords(coords, self.resolution) for coords in zone
]
elif all(
all((isinstance(i, int) and i >= 0) for i in coords) for coords in zone
):
# list is in pixel value.
zone_points = zone # type: ignore
else:
raise ValueError(
f"Zone {zone} needs to be all pixel-wise points or all fractions "
"of the frame between 0 and 1. Please check zone_count configs."
)
created_zone = Zone(zone_points)
return created_zone
def _get_config_types(self) -> Dict[str, Any]:
"""Returns dictionary mapping the node's config keys to respective types."""
return {"resolution": List[int], "zones": List[List[List[Union[int, float]]]]}
@staticmethod
def _get_pixel_coords(
coords: List[Union[float, int]], resolution: List[int]
) -> List[int]:
"""Returns the pixel position of the zone points."""
return [int(coords[0] * resolution[0]), int(coords[1] * resolution[1])]