lepton 熱像儀

主要參考來源是這邊:
https://learn.sparkfun.com/tutorials/flir-lepton-hookup-guide

裡面提到很多前置作業, 像是開啟I2C, SPI...

接下來就是抓source code了!

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1. Code for getting started with the FLIR Lepton breakout board
https://github.com/groupgets/LeptonModule

這邊的話, 有用過 raspberrypi_video 與 v4l2lepton 做過測試

A. raspberrypi_video
https://github.com/groupgets/LeptonModule/tree/master/software/raspberrypi_video

sudo raspi-config  # enable the SPI and I2C

sudo apt-get install qt4-dev-tools

qmake && make  # cd to the LeptonModule/sofware/raspberrypi_video folder

./raspberrypi_video

然後就會看到熱影像畫面了

如果這時候只看到一個紅色框框, 據說是相機模組(?)沒有裝好

把黑色的模組拔下來再重插就好

B. v4l2lepton

https://github.com/groupgets/LeptonModule/tree/master/software/v4l2lepton

這邊有參考台灣樹莓派的流程https://github.com/raspberrypi-tw/meetup19

* Build v4l2loopback virtual device node.

# Install Kernel Source and Header

sudo apt-get update

sudo apt-get install bc libncurses5-dev flex bison

sudo wget https://raw.githubusercontent.com/notro/rpi-source/master/rpi-source -O /usr/bin/rpi-source && sudo chmod +x /usr/bin/rpi-source && /usr/bin/rpi-source -q --tag-update

rpi-source

# Install required module

pip3 install imutils

pip3 install opencv-python==3.4.6.27

* Install V4L2 Kernel Module

$ cd ~

$ git clone https://github.com/umlaeute/v4l2loopback

$ cd ~/v4l2loopback

$ sudo make

$ sudo make install

$ sudo depmod -a

$ sudo modprobe v4l2loopback

* Enable FLIR Camera V4L2

cd ~

git clone https://github.com/groupgets/LeptonModule

cd ~/LeptonModule/software/v4l2lepton

sed -i -e 's/video1/video0/g' v4l2lepton.cpp

make

sudo ./v4l2lepton -v /dev/video0 & -d /dev/spidev0.0  # 這邊的編號會根據每個人的環境發生變化

然後終端機會看到下面的訊息: (要看到第二行的done reading才會有畫面)

Waiting for sink

done reading, resets: 

接下來去執行台灣樹莓派的範例 (flir_preview.py)就可以看到熱像儀畫面了

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2. pylepton: Quick and dirty pure python library for interfacing with FLIR lepton

https://github.com/groupgets/pylepton

這邊有流程: https://lepton.flir.com/forums/topic/pylepton-overlay-guide-2-0-for-raspbian-pixel/

sudo apt-get install python-opencv python-numpy

git clone https://github.com/kekiefer/pylepton.git

cd pylepton

sudo python setup.py install

然後執行 pylepton_overlay 就可以看到畫面了

不過這個程式是融合 pi camera 與 熱像儀的畫面, 所以需要設定透明度

官網範例: pylepton_overlay -a 255 就是100% lepton overlay 

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後記(?)

感覺要用python去開發的話, 用v4l2lepton 似乎比較方便

只是這個東西似乎沒辦法取代額溫槍來量體溫, 誤差似乎比較大

而且還沒看到校正的方式 QQ