ofxSeekThermal

simple addon to use SeekThermal compact thermo cam in openframeworks app

Mega thanks:

• maartenvds's amazing repo

https://github.com/OpenThermal/libseek-thermal

• hoehermann's work on absolute temperature reading

https://github.com/hoehermann/libseek-thermal/tree/temp-info_compact

tested on:

• MacBook Pro (15-inch, mid 2014), MacOSX 10.14.6, oF0.11.0
• MacBook Pro (15-inch, late 2018), macOS 11.0, oF0.11.0
• Mac mini (M1, 2020), macOS 11.0.1, oF0.11.0

How to use:

1. Update opencv.a in ofxOpenCv in your OF directory

The original static library bundled to ofxOpenCv doesn't support some core OpenCV functions by default. I put modified versions in my another repo and you can download .a file for your platform.

(terminal, example for osx)
$ cd dir/to/your/OF/addons/ofxOpenCv/libs/opencv/lib/osx
$ mv opencv.a opencv.a.old
$ wget https://github.com/ryohajika/AnotherCvLibForOfxOpenCv/raw/main/osx/opencv.a

caution: the modified versions supports 64bit only

2. Clone this project along with submodules

This addon uses my fork of libseek-thermal, and you need to clone it along with this repo as a submodule.

(terminal)
$ cd dir/to/your/OF/addons
$ git clone https://github.com/ryohajika/ofxSeekThermal
$ cd ofxSeekThermal
$ git submodule init
$ git submodule update

After these you can run the example project.

Implementation details:

The ofxSeekThermalGrabber is implemented based on ofVideoGrabber and ofAVFoundationGrabber. You can use the same method most of the case to setup, update, and draw pixels. Please check out ofxSeekThermal.h for the methods available.

With a method setCreateFlatField(unsigned int warmup_frame_count, unsigned int smoothing_frame_count, std::string flatfield_image_path) to create a FlatField (refer an example in libseek-thermal) to calibrate camera. Note on this method: it smoothen the frame out put, however, it affects the absolute temperature estimation.

In a header file ofxSeekThermalUtility.h, some utility functions are implemented. You can use ofxSeekThermal::toOf and ofxSeekThermal::toCv to convert color image frames between ofPixels and cv::Mat. Cannot be used to convert raw frame at this point

Better to use cv::imwrite to export raw frame data, but you need to customize some part of source code at this point (it will be implemented as a method belongs to the ofxSeekThermalGrabber class soon!)

You can switch console log ON/OFF by using a method setVerbose(bool true_or_false) if you want to see/shutoff log around thermal camera.

TODO:

• support open/close capability of seek camera while an ofApp is running
• put some info how to use this
• add thread error handler for the stability

created by:

Ryo Hajika (imaginaryShort)