scripts/examples: Update PureThermal example script to new API.

This commit is contained in:
Kwabena W. Agyeman 2025-07-20 21:24:23 -07:00
parent 1177105663
commit 1a614202ee

View File

@ -4,14 +4,14 @@
#
# Pure Thermal Example Script
#
# Thanks for buying the Pure Thermal OpenMV! This example script shows off thermal video
# overlay onto the color camera image and driving the attached LCD screen and HDMI output.
# Thanks for buying the Pure Thermal OpenMV! This example script shows
# off thermal video overlay onto the color camera image and driving
# the attached LCD screen and HDMI output.
import sensor
import csi
import image
import time
import display
import fir
import math
import tfp410
@ -19,13 +19,42 @@ import tfp410
# Color Tracking Thresholds (Grayscale Min, Grayscale Max)
threshold_list = [(200, 255)]
sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.WVGA)
# Set the target temp range here
min_temp_in_celsius = 20.0
max_temp_in_celsius = 40.0
csi0 = csi.CSI(cid=csi.OV5640)
csi0.reset()
csi0.pixformat(csi.RGB565)
csi0.framesize(csi.WVGA)
time.sleep_ms(50)
fir.init(fir.FIR_LEPTON)
fir_img = image.Image(fir.width(), fir.height(), sensor.GRAYSCALE)
csi1 = csi.CSI(cid=csi.LEPTON)
csi1.reset(hard=False)
csi1.pixformat(csi.GRAYSCALE)
csi1.framesize(csi.QQVGA)
# Enables exact temperature measurments from the flir lepton.
# The second argument turns high gain mode on for high temp reading.
csi1.ioctl(csi.IOCTL_LEPTON_SET_MODE, True, False)
csi1.ioctl(
csi.IOCTL_LEPTON_SET_RANGE, min_temp_in_celsius, max_temp_in_celsius
)
print(
"Lepton Res (%dx%d)"
% (
csi1.ioctl(csi.IOCTL_LEPTON_GET_WIDTH),
csi1.ioctl(csi.IOCTL_LEPTON_GET_HEIGHT),
)
)
print(
"Radiometry Available: "
+ ("Yes" if csi1.ioctl(csi.IOCTL_LEPTON_GET_RADIOMETRY) else "No")
)
fir_img = image.Image(csi1.width(), csi1.height(), image.GRAYSCALE)
time.sleep_ms(50)
lcd = display.RGBDisplay(framesize=display.FWVGA, refresh=60)
@ -33,7 +62,7 @@ lcd.backlight(True)
hdmi = tfp410.TFP410()
time.sleep_ms(50)
alpha_pal = image.Image(256, 1, sensor.GRAYSCALE)
alpha_pal = image.Image(256, 1, image.GRAYSCALE)
for i in range(256):
alpha_pal[i] = int(math.pow((i / 255), 2) * 255)
@ -42,18 +71,20 @@ to_max = None
def map_g_to_temp(g):
return ((g * (to_max - to_min)) / 255.0) + to_min
return (
(g * (max_temp_in_celsius - min_temp_in_celsius)) / 255.0
) + min_temp_in_celsius
# Kickstart thermal camera capture.
csi1.snapshot(update=False, blocking=True, image=fir_img)
while True:
img = sensor.snapshot()
# ta: Ambient temperature
# ir: Object temperatures (IR array)
# to_min: Minimum object temperature
# to_max: Maximum object temperature
ta, ir, to_min, to_max = fir.read_ir()
img = csi0.snapshot()
# Capture the thermal image without blocking.
csi1.snapshot(update=False, blocking=False, image=fir_img)
fir.draw_ir(fir_img, ir, color_palette=None)
fir_img_size = fir_img.width() * fir_img.height()
# Find IR Blobs
@ -65,8 +96,12 @@ while True:
# Collect stats into a list of tuples
blob_stats = []
for b in blobs:
blob_stats.append((b.rect(), map_g_to_temp(img.get_statistics(thresholds=threshold_list,
roi=b.rect()).mean())))
blob_stats.append(
(b.rect(), map_g_to_temp(fir_img.get_statistics(
thresholds=threshold_list, roi=b.rect()
).mean()))
)
x_scale = img.width() / fir_img.width()
y_scale = img.height() / fir_img.height()
img.draw_image(fir_img, 0, 0, x_scale=x_scale, y_scale=y_scale,
@ -76,19 +111,17 @@ while True:
# Draw stuff on the colored image
for b in blobs:
img.draw_rectangle(int(b.rect()[0] * x_scale), int(b.rect()[1] * y_scale),
int(b.rect()[2] * x_scale), int(b.rect()[3] * y_scale))
img.draw_rectangle(int(b.rect()[0] * x_scale),
int(b.rect()[1] * y_scale),
int(b.rect()[2] * x_scale),
int(b.rect()[3] * y_scale))
img.draw_cross(int(b.cx() * x_scale), int(b.cy() * y_scale))
for blob_stat in blob_stats:
img.draw_string(int((blob_stat[0][0] * x_scale) + 4), int((blob_stat[0][1] * y_scale) + 1),
img.draw_string(int((blob_stat[0][0] * x_scale) + 4),
int((blob_stat[0][1] * y_scale) + 1),
'%.2f C' % blob_stat[1], mono_space=False, scale=2)
# Draw ambient, min and max temperatures.
img.draw_string(4, 0, 'Lepton Temp: %0.2f C' % ta,
color=(255, 255, 255), mono_space=False, scale=2)
img.draw_string(4, 18, 'Min Temp: %0.2f C' % to_min,
color=(255, 255, 255), mono_space=False, scale=2)
img.draw_string(4, 36, 'Max Temp: %0.2f C' % to_max,
color=(255, 255, 255), mono_space=False, scale=2)
lcd.write(img, hint=(image.BILINEAR | image.CENTER | image.SCALE_ASPECT_KEEP))
lcd.write(img, hint=(
image.BILINEAR | image.CENTER | image.SCALE_ASPECT_KEEP
))