openmv/scripts/examples/50-OpenMV-Boards/54-Thermopile-Shield/thermal_overlay.py

73 lines
2.0 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
#
# Thermal Overlay Demo
#
# This example shows off how to overlay a heatmap onto your OpenMV Cam's
# live video output from the main camera.
import sensor
import image
import time
import fir
# or image.BILINEAR or 0 (nearest neighbor)
drawing_hint = image.BICUBIC | image.CENTER | image.SCALE_ASPECT_KEEP
ALT_OVERLAY = False # Set to True to allocate a second ir image.
sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QQVGA)
sensor.skip_frames(time=2000)
# Initialize the thermal sensor
fir.init()
# Allocate another frame buffer for smoother video.
extra_fb = sensor.alloc_extra_fb(sensor.width(), sensor.height(), sensor.RGB565)
# FPS clock
clock = time.clock()
while True:
clock.tick()
# Capture an image
img = sensor.snapshot()
# Capture FIR data
# ta: Ambient temperature
# ir: Object temperatures (IR array)
# to_min: Minimum object temperature
# to_max: Maximum object temperature
try:
ta, ir, to_min, to_max = fir.read_ir()
except OSError:
continue
if not ALT_OVERLAY:
# Scale the image and belnd it with the framebuffer
fir.draw_ir(img, ir, hint=drawing_hint)
else:
# Create a secondary image and then blend into the frame buffer.
extra_fb.clear()
fir.draw_ir(extra_fb, ir, alpha=256, hint=drawing_hint)
img.blend(extra_fb, alpha=128)
# Draw ambient, min and max temperatures.
img.draw_string(8, 0, "Ta: %0.2f C" % ta, color=(255, 0, 0), mono_space=False)
img.draw_string(
8, 8, "To min: %0.2f C" % to_min, color=(255, 0, 0), mono_space=False
)
img.draw_string(
8, 16, "To max: %0.2f C" % to_max, color=(255, 0, 0), mono_space=False
)
# Force high quality streaming...
img.compress(quality=90)
# Print FPS.
print(clock.fps())