# Lepton Get Object Temp Example # # This example shows off how to get an object's temperature using color tracking. # By turning the AGC off and setting a max and min temperature range you can make the lepton into # a great sensor for seeing objects of a particular temperature. That said, the FLIR lepton is a # microblobometer and not a thermophile. So, it needs to re-calibrate itself often (which is called # flat-field-correction - FFC). Additionally, microblobmeter devices require pprocessing support # onboard to deal with the effects of temperature drift which is called radiometry support. # FLIR Lepton Shutter Note: FLIR Leptons with radiometry and a shutter will pause the video often # as they heatup to re-calibrate. This will happen less and less often as the sensor temperature # stablizes. You can force the re-calibration to not happen if you need to via the lepton API. # However, it is not recommended because the image will degrade overtime. # If you are using a LEPTON other than the Lepton 3.5 this script may not work perfectly as other # leptons don't have radiometry support or they don't activate their calibration process often # enough to deal with temperature changes (FLIR 2.5). import sensor import time # Color Tracking Thresholds (Grayscale Min, Grayscale Max) threshold_list = [(200, 255)] # Set the target temp range here min_temp_in_celsius = 20.0 max_temp_in_celsius = 35.0 print("Resetting Lepton...") # These settings are applied on reset sensor.reset() sensor.ioctl(sensor.IOCTL_LEPTON_SET_MEASUREMENT_MODE, True) sensor.ioctl( sensor.IOCTL_LEPTON_SET_MEASUREMENT_RANGE, min_temp_in_celsius, max_temp_in_celsius ) print( "Lepton Res (%dx%d)" % ( sensor.ioctl(sensor.IOCTL_LEPTON_GET_WIDTH), sensor.ioctl(sensor.IOCTL_LEPTON_GET_HEIGHT), ) ) print( "Radiometry Available: " + ("Yes" if sensor.ioctl(sensor.IOCTL_LEPTON_GET_RADIOMETRY) else "No") ) sensor.set_pixformat(sensor.GRAYSCALE) sensor.set_framesize(sensor.QQVGA) sensor.skip_frames(time=5000) clock = time.clock() # Only blobs that with more pixels than "pixel_threshold" and more area than "area_threshold" are # returned by "find_blobs" below. Change "pixels_threshold" and "area_threshold" if you change the # camera resolution. "merge=True" merges all overlapping blobs in the image. def map_g_to_temp(g): return ( (g * (max_temp_in_celsius - min_temp_in_celsius)) / 255.0 ) + min_temp_in_celsius while True: clock.tick() img = sensor.snapshot() for blob in img.find_blobs( threshold_list, pixels_threshold=200, area_threshold=200, merge=True ): stats = img.get_statistics(thresholds=threshold_list, roi=blob.rect()) img.draw_rectangle(blob.rect()) img.draw_cross(blob.cx(), blob.cy()) img.draw_string( blob.x(), blob.y() - 10, "%.2f C" % map_g_to_temp(stats.mean()), mono_space=False, ) print( "FPS %f - Lepton Temp: %f C" % (clock.fps(), sensor.ioctl(sensor.IOCTL_LEPTON_GET_FPA_TEMPERATURE)) )