cesar
43cb1ff01c
A display sink that overlays bounding boxes and text on an image input and shows it in an OpenCV window. Based on opencv-plot from dora-hub, brought up to the dora 1.0 node contract and packaged with uv. Python rather than Rust: the opencv Rust crate generates its bindings from the OpenCV headers on the build machine, so it needs libopencv-dev and libclang-dev per machine and per architecture and does not cross-compile. Every dependency here ships prebuilt wheels for linux-x86_64, linux-aarch64 and macos-arm64. Covers every encoding the upstream node did — bgr8, rgb8, jpeg/jpg/jpe/bmp/ webp/png, yuv420 and avif — plus both bbox formats, the text overlay, PLOT_WIDTH/PLOT_HEIGHT and headless operation under CI=true.
73 lines
2.0 KiB
Python
73 lines
2.0 KiB
Python
"""The display state: the frame, the overlays drawn on it, and the window."""
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from dataclasses import dataclass, field
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import cv2
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import numpy as np
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WINDOW = "Dora Node: opencv-plot"
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GREEN = (0, 255, 0)
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WHITE = (255, 255, 255)
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FONT = cv2.FONT_HERSHEY_SIMPLEX
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FONT_SCALE = 0.5
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@dataclass
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class Bboxes:
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"""One overlay's worth of boxes, always stored as xyxy corners."""
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corners: np.ndarray = field(default_factory=lambda: np.empty((0, 4)))
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conf: np.ndarray = field(default_factory=lambda: np.empty(0))
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labels: np.ndarray = field(default_factory=lambda: np.empty(0, dtype=object))
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@dataclass
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class Plot:
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"""Overlay state, plus the window it is displayed in.
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`headless` suppresses the window; the node still decodes every input.
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"""
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width: int | None = None
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height: int | None = None
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headless: bool = False
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bboxes: Bboxes = field(default_factory=Bboxes)
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text: str = ""
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def show(self, frame: np.ndarray) -> bool:
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"""Draw the overlays on `frame`, resize it, and display it.
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Returns whether the viewer asked to quit by pressing `q`.
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"""
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self._draw(frame)
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if self.width and self.height:
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frame = cv2.resize(frame, (self.width, self.height))
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if self.headless:
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return False
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cv2.imshow(WINDOW, frame)
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return cv2.waitKey(1) & 0xFF == ord("q")
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def _draw(self, frame: np.ndarray) -> None:
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for corners, conf, label in zip(
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self.bboxes.corners,
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self.bboxes.conf,
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self.bboxes.labels,
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strict=False,
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):
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min_x, min_y, max_x, max_y = (int(value) for value in corners)
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cv2.rectangle(frame, (min_x, min_y), (max_x, max_y), GREEN, 2)
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cv2.putText(
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frame,
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f"{label}, {conf:0.2f}",
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(max_x - 120, max_y - 10),
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FONT,
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FONT_SCALE,
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GREEN,
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1,
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)
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cv2.putText(frame, self.text, (20, 20), FONT, FONT_SCALE, WHITE, 1)
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