openmv/scripts/examples/01-Camera/05-FLIR-Lepton/lepton_get_object_temp_lcd.py

91 lines
3.3 KiB
Python

# This work is licensed under the MIT license.
# Copyright (c) 2013-2023 OpenMV LLC. All rights reserved.
# https://github.com/openmv/openmv/blob/master/LICENSE
#
# 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
# stabilizes. 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
import display
# 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.LCD)
sensor.skip_frames(time=5000)
clock = time.clock()
lcd = display.SPIDisplay()
# 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,
)
lcd.write(img)
print(
"FPS %f - Lepton Temp: %f C"
% (clock.fps(), sensor.ioctl(sensor.IOCTL_LEPTON_GET_FPA_TEMPERATURE))
)