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95 lines
3.2 KiB
Python
95 lines
3.2 KiB
Python
# This work is licensed under the MIT license.
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# Copyright (c) 2013-2024 OpenMV LLC. All rights reserved.
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# https://github.com/openmv/openmv/blob/master/LICENSE
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#
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# Pure Thermal Example Script
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#
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# Thanks for buying the Pure Thermal OpenMV! This example script shows off thermal video
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# overlay onto the color camera image and driving the attached LCD screen and HDMI output.
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import sensor
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import image
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import time
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import display
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import fir
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import math
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import tfp410
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# Color Tracking Thresholds (Grayscale Min, Grayscale Max)
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threshold_list = [(200, 255)]
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sensor.reset()
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sensor.set_pixformat(sensor.RGB565)
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sensor.set_framesize(sensor.WVGA)
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time.sleep_ms(50)
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fir.init(fir.FIR_LEPTON)
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fir_img = image.Image(fir.width(), fir.height(), sensor.GRAYSCALE)
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time.sleep_ms(50)
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lcd = display.RGBDisplay(framesize=display.FWVGA, refresh=60)
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lcd.backlight(True)
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hdmi = tfp410.TFP410()
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time.sleep_ms(50)
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alpha_pal = image.Image(256, 1, sensor.GRAYSCALE)
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for i in range(256):
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alpha_pal[i] = int(math.pow((i / 255), 2) * 255)
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to_min = None
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to_max = None
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def map_g_to_temp(g):
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return ((g * (to_max - to_min)) / 255.0) + to_min
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while True:
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img = sensor.snapshot()
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# ta: Ambient temperature
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# ir: Object temperatures (IR array)
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# to_min: Minimum object temperature
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# to_max: Maximum object temperature
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ta, ir, to_min, to_max = fir.read_ir()
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fir.draw_ir(fir_img, ir, color_palette=None)
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fir_img_size = fir_img.width() * fir_img.height()
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# Find IR Blobs
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blobs = fir_img.find_blobs(threshold_list,
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pixels_threshold=(fir_img_size // 100),
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area_threshold=(fir_img_size // 100),
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merge=True)
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# Collect stats into a list of tuples
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blob_stats = []
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for b in blobs:
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blob_stats.append((b.rect(), map_g_to_temp(img.get_statistics(thresholds=threshold_list,
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roi=b.rect()).mean())))
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x_scale = img.width() / fir_img.width()
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y_scale = img.height() / fir_img.height()
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img.draw_image(fir_img, 0, 0, x_scale=x_scale, y_scale=y_scale,
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color_palette=image.PALETTE_IRONBOW,
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alpha_palette=alpha_pal,
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hint=image.BICUBIC)
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# Draw stuff on the colored image
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for b in blobs:
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img.draw_rectangle(int(b.rect()[0] * x_scale), int(b.rect()[1] * y_scale),
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int(b.rect()[2] * x_scale), int(b.rect()[3] * y_scale))
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img.draw_cross(int(b.cx() * x_scale), int(b.cy() * y_scale))
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for blob_stat in blob_stats:
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img.draw_string(int((blob_stat[0][0] * x_scale) + 4), int((blob_stat[0][1] * y_scale) + 1),
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'%.2f C' % blob_stat[1], mono_space=False, scale=2)
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# Draw ambient, min and max temperatures.
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img.draw_string(4, 0, 'Lepton Temp: %0.2f C' % ta,
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color=(255, 255, 255), mono_space=False, scale=2)
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img.draw_string(4, 18, 'Min Temp: %0.2f C' % to_min,
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color=(255, 255, 255), mono_space=False, scale=2)
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img.draw_string(4, 36, 'Max Temp: %0.2f C' % to_max,
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color=(255, 255, 255), mono_space=False, scale=2)
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lcd.write(img, hint=(image.BILINEAR | image.CENTER | image.SCALE_ASPECT_KEEP))
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