# Send Pywayne Cv Apriltag Detector to your agent
Hand the extracted package to your coding agent with a concrete install brief instead of figuring it out manually.
## Fast path
- Download the package from Yavira.
- Extract it into a folder your agent can access.
- Paste one of the prompts below and point your agent at the extracted folder.
## Suggested prompts
### New install

```text
I downloaded a skill package from Yavira. Read SKILL.md from the extracted folder and install it by following the included instructions. Tell me what you changed and call out any manual steps you could not complete.
```
### Upgrade existing

```text
I downloaded an updated skill package from Yavira. Read SKILL.md from the extracted folder, compare it with my current installation, and upgrade it while preserving any custom configuration unless the package docs explicitly say otherwise. Summarize what changed and any follow-up checks I should run.
```
## Machine-readable fields
```json
{
  "schemaVersion": "1.0",
  "item": {
    "slug": "apriltag-detector",
    "name": "Pywayne Cv Apriltag Detector",
    "source": "tencent",
    "type": "skill",
    "category": "AI 智能",
    "sourceUrl": "https://clawhub.ai/wangyendt/apriltag-detector",
    "canonicalUrl": "https://clawhub.ai/wangyendt/apriltag-detector",
    "targetPlatform": "OpenClaw"
  },
  "install": {
    "downloadUrl": "/downloads/apriltag-detector",
    "sourceDownloadUrl": "https://wry-manatee-359.convex.site/api/v1/download?slug=apriltag-detector",
    "sourcePlatform": "tencent",
    "targetPlatform": "OpenClaw",
    "packageFormat": "ZIP package",
    "primaryDoc": "SKILL.md",
    "includedAssets": [
      "SKILL.md"
    ],
    "downloadMode": "redirect",
    "sourceHealth": {
      "source": "tencent",
      "status": "healthy",
      "reason": "direct_download_ok",
      "recommendedAction": "download",
      "checkedAt": "2026-04-30T16:55:25.780Z",
      "expiresAt": "2026-05-07T16:55:25.780Z",
      "httpStatus": 200,
      "finalUrl": "https://wry-manatee-359.convex.site/api/v1/download?slug=network",
      "contentType": "application/zip",
      "probeMethod": "head",
      "details": {
        "probeUrl": "https://wry-manatee-359.convex.site/api/v1/download?slug=network",
        "contentDisposition": "attachment; filename=\"network-1.0.0.zip\"",
        "redirectLocation": null,
        "bodySnippet": null
      },
      "scope": "source",
      "summary": "Source download looks usable.",
      "detail": "Yavira can redirect you to the upstream package for this source.",
      "primaryActionLabel": "Download for OpenClaw",
      "primaryActionHref": "/downloads/apriltag-detector"
    },
    "validation": {
      "installChecklist": [
        "Use the Yavira download entry.",
        "Review SKILL.md after the package is downloaded.",
        "Confirm the extracted package contains the expected setup assets."
      ],
      "postInstallChecks": [
        "Confirm the extracted package includes the expected docs or setup files.",
        "Validate the skill or prompts are available in your target agent workspace.",
        "Capture any manual follow-up steps the agent could not complete."
      ]
    }
  },
  "links": {
    "detailUrl": "https://openagent3.xyz/skills/apriltag-detector",
    "downloadUrl": "https://openagent3.xyz/downloads/apriltag-detector",
    "agentUrl": "https://openagent3.xyz/skills/apriltag-detector/agent",
    "manifestUrl": "https://openagent3.xyz/skills/apriltag-detector/agent.json",
    "briefUrl": "https://openagent3.xyz/skills/apriltag-detector/agent.md"
  }
}
```
## Documentation

### Pywayne AprilTag Detector

This module detects AprilTag fiducial markers for camera calibration and pose estimation.

### Quick Start

from pywayne.cv.apriltag_detector import ApriltagCornerDetector

# Create detector
detector = ApriltagCornerDetector()

# Detect from file path
detections = detector.detect('test.png', show_result=True)

# Detect from numpy array
import cv2
image = cv2.imread('test.png')
detections = detector.detect(image)

### detect()

Detect AprilTags in an image:

detections = detector.detect(
    image,           # File path, Path object, or numpy array
    show_result=False  # Show visualization window
)

Returns list of detection results with:

id: Tag ID
hamming_distance: Detection confidence
center: Tag center coordinates (x, y)
corners: 4 corner coordinates

### detect_and_draw()

Detect AprilTags and draw results on original image:

result_image = detector.detect_and_draw(image)
cv2.imshow('Detection Result', result_image)
cv2.waitKey(0)

Visualization includes:

Green polygon outlines
Red corner circles
Red ID labels at tag centers

### Requirements

cv2 (OpenCV) - Image processing
numpy - Array operations
gettool - Downloads apriltag_detection library automatically

### Library Installation

The detector automatically checks for and installs the apriltag_detection library using gettool if not found.

### Detection Result Format

Each detection contains:

FieldDescriptionidTag identifierhamming_distanceHamming distance (lower = more confident)centerTag center as (x, y) tuplecorners4 corner coordinates as [(x1, y1), (x2, y2), (x3, y3), (x4, y4)]

### Notes

Supports both grayscale and BGR images
Automatic grayscale conversion for detection
Visualization sizes scale with image dimensions
Uses AprilTag 36h11 tag family
## Trust
- Source: tencent
- Verification: Indexed source record
- Publisher: wangyendt
- Version: 0.1.0
## Source health
- Status: healthy
- Source download looks usable.
- Yavira can redirect you to the upstream package for this source.
- Health scope: source
- Reason: direct_download_ok
- Checked at: 2026-04-30T16:55:25.780Z
- Expires at: 2026-05-07T16:55:25.780Z
- Recommended action: Download for OpenClaw
## Links
- [Detail page](https://openagent3.xyz/skills/apriltag-detector)
- [Send to Agent page](https://openagent3.xyz/skills/apriltag-detector/agent)
- [JSON manifest](https://openagent3.xyz/skills/apriltag-detector/agent.json)
- [Markdown brief](https://openagent3.xyz/skills/apriltag-detector/agent.md)
- [Download page](https://openagent3.xyz/downloads/apriltag-detector)