mini-vision 0.3.1

YOLO segmentation utilities for video streams

mini_vision

Simple Python library for object segmentation in video streams using YOLO models.

The goal of this library is to provide a modular pipeline to:

• consume video streams
• perform object segmentation
• render contours or masks

The library follows data-oriented design and low coupling principles, allowing easy replacement of computer vision models.

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Installation

pip install mini-vision

Usage

Example showing how to use vision-seg to consume a video stream, run YOLO segmentation, and render object contours.

Import the library

from mini_vision import (
    YoloSegmenter,
    SegmentationRenderer,
    WSFrameClient
)

Components:

Component	Description
YoloSegmenter	Runs object segmentation using a YOLO segmentation model
SegmentationRenderer	Draws segmentation contours on the frame
WSFrameClient	Connects to a WebSocket video stream and yields frames

YoloSegmenter

Runs object segmentation using a YOLO segmentation model.

segmenter = YoloSegmenter("yolov8n-seg.pt")
detections = segmenter.segment(frame)

SegmentationRenderer

Responsible for rendering segmentation contours on frames.

renderer = SegmentationRenderer()
frame = renderer.draw(
    frame,
    detections,
    mode="contour",
    detect_object=["car","person","dog"],
    detect_color=["gold","neon_pink","lime"],
    thickness=2
)

JSON Output (optional)

SegmentationRenderer can optionally return structured detection data in JSON format. This allows integration with logging systems, APIs, analytics pipelines, or other downstream processing tools. To enable this feature, pass return_json=True

frame, data = renderer.draw(
    frame,
    detections,
    mode="contour",
    detect_object=["car","person","dog"],
    detect_color=["gold","neon_pink","lime"],
    thickness=2,
    return_json=True
)

Example JSON output:

{
  "detections": [
    {
      "label": "person",
      "confidence": 0.92,
      "bbox": [120, 80, 240, 300]
    },
    {
      "label": "car",
      "confidence": 0.88,
      "bbox": [400, 210, 560, 350]
    }
  ]
}

If return_json is not enabled, the renderer behaves normally and only returns the processed frame.

TOON Output

the renderer can also return detections in TOON format, a lightweight text representation designed for agent pipelines, logging, and token-efficient LLM processing. Enable it using return_toon=True

frame, toon = renderer.draw(
    frame,
    detections,
    return_toon=True
)

Example TOON output:

frame_width=1280 frame_height=720
label=person x=412 y=210 w=120 h=260 cx=472 cy=340 area=31200 score=0.91
label=car x=102 y=320 w=180 h=90 cx=192 cy=365 area=16200 score=0.88

WSFrameClient

Connects to a WebSocket video stream and yields frames.

client = WSFrameClient("ws://127.0.0.1:8000/ws/frames")
async for frame in client.frames():