Flir app on Android has this feature built-in. https://play.google.com/store/apps/details?id=georg.com.thermal_camera_plus&hl=en https://play.google.com/store/

Flir app on Android has this feature built-in. https://play.google.com/store/apps/details?id=georg.com.thermal_camera_plus&hl=en https://play.google.com/store/apps/details?id=georg.com.ther...