pythermalcamera 0.1.0

A Python library for interacting with the Topdon TC001 thermal camera.

pythermalcamera - Topdon TC001 Thermal Camera Library

A Python library for interacting with the Topdon TC001 thermal camera. This library simplifies device discovery, provides a live interactive preview with temperature analysis, and supports capturing full-resolution thermal images with associated JSON metadata.

Features

• Auto-Detection: Automatically finds the correct video device ID for the TC001 by scanning /dev/video*.
• Live Preview: Interactive window showing the thermal heatmap with a center crosshair, HUD, and real-time statistics (Min/Max/Avg).
• Area of Interest (ROI): Interactively select a region in the preview to focus temperature analysis (statistics will only reflect the chosen box).
• High-Quality Captures: Save colorized heatmaps as PNG and full temperature metadata as JSON.
• Marker Overlays: Toggleable hotspot and coldspot markers on both the preview and captured images.
• Background Threading: Optionally run the preview in a non-blocking background thread while performing other tasks in the main script.
• Extensive Metadata: Captures include timestamps, raw temperature stats, ROI coordinates, and all rendering settings (colormap, alpha, blur, etc.).

Prerequisites

• Hardware: Topdon TC001 Thermal Camera.
• Operating System: Linux (developed and tested on Linux with V4L2).
• Dependencies:
  • opencv-python
  • numpy

Installation

Ensure you have the dependencies installed:

pip install opencv-python numpy

Then, include the pythermalcamera package in your project.

Usage

Quick Start (Demo Script)

Run the included demo to see the library in action:

# Auto-detect camera and start interactive preview
python3 demo_library.py

# Run preview in background and take a manual capture after 5 seconds
python3 demo_library.py --preview

# Enable markers on the manual capture
python3 demo_library.py --markers

Basic Library API

from pythermalcamera import ThermalCamera
import cv2

# Initialize with auto-detection and non-blocking preview
with ThermalCamera(include_preview=True) as cam:
    # Do something else while the preview runs...
    import time
    time.sleep(5)
    
    # Take a manual snapshot with specific settings
    result = cam.capture(
        filename_prefix="Snapshot",
        colormap=cv2.COLORMAP_MAGMA,
        include_markers=True
    )
    
    if result:
        print(f"Captured {result['image']}")
        print(f"Max Temp: {result['metadata']['max_temp']}°C")

Interactive Controls (Preview Window)

When the preview window is active, use the following keyboard shortcuts:

Key	Action
q	Quit preview
p	Take snapshot (saves PNG + JSON)
r	Reset/Clear ROI (Area of Interest)
m	Cycle through available colormaps
h	Toggle HUD (On-screen statistics)
k	Toggle markers (hotspot/coldspot) for snapshots
a/z	Increase / Decrease Blur
s/x	Increase / Decrease Marker Threshold
d/c	Increase / Decrease Display Scale
f/v	Increase / Decrease Contrast (Alpha)

Mouse Controls:

• Left-Click & Drag: Select an Region of Interest (ROI) box on the preview.

Metadata Format

Snapshots generate a .json file containing:

• timestamp: Unix timestamp of the capture.
• center_temp, max_temp, min_temp, avg_temp: Temperature readings in Celsius.
• max_pos, min_pos: Pixel coordinates of the hotspot and coldspot.
• roi: Coordinates of the active ROI at the time of capture.
• settings: All rendering parameters used to generate the PNG (colormap, scale, blur, etc.).

Credits and Attribution

This library is inspired by and based on the work of:

• Les Wright's PyThermalCamera: https://github.com/leswright1977/PyThermalCamera
• Researcher LeoDJ: For their significant contributions and enhancements to the thermal camera research. Specifically, huge kudos to LeoDJ for reverse engineering the thermal image format to extract raw temperature data.
  • EEVBlog forum discussion
  • LeoDJ's P2Pro-Viewer GitHub

License

This project is licensed under the MIT License - see the LICENSE file for details (if provided).