4. selftest自检，显示COLOR BARS TEST FALLED 是什么回事？
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    • selftest自检，显示COLOR BARS TEST FALLED 是什么回事？

    • C

      0_1725535024539_屏幕截图 2024-09-02 221628.png

      Self Test Example

      This example shows how your OpenMV Cam tests itself before being allowed out

      of the factory. Every OpenMV Cam should pass this test.

      import sensor
      import pyb

      def test_int_adc():
      adc = pyb.ADCAll(12)
      # Test VBAT
      vbat = adc.read_core_vbat()
      vbat_diff = abs(vbat - 3.3)
      if vbat_diff > 0.1:
      raise Exception("INTERNAL ADC TEST FAILED VBAT=%fv" % vbat)

      # Test VREF
vref = adc.read_core_vref()
vref_diff = abs(vref - 1.2)
if vref_diff > 0.1:
    raise Exception("INTERNAL ADC TEST FAILED VREF=%fv" % vref)
adc = None
print("INTERNAL ADC TEST PASSED...")

      def test_color_bars():
      sensor.reset()
      # Set sensor settings
      sensor.set_brightness(0)
      sensor.set_saturation(3)
      sensor.set_gainceiling(8)
      sensor.set_contrast(2)

      # Set sensor pixel format
sensor.set_framesize(sensor.QVGA)
sensor.set_pixformat(sensor.RGB565)

# Enable colorbar test mode
sensor.set_colorbar(True)

# Skip a few frames to allow the sensor settle down
for i in range(0, 100):
    image = sensor.snapshot()

# color bars thresholds
t = [
    lambda r, g, b: r < 70 and g < 70 and b < 70,  # Black
    lambda r, g, b: r < 70 and g < 70 and b > 200,  # Blue
    lambda r, g, b: r > 200 and g < 70 and b < 70,  # Red
    lambda r, g, b: r > 200 and g < 70 and b > 200,  # Purple
    lambda r, g, b: r < 70 and g > 200 and b < 70,  # Green
    lambda r, g, b: r < 70 and g > 200 and b > 200,  # Aqua
    lambda r, g, b: r > 200 and g > 200 and b < 70,  # Yellow
    lambda r, g, b: r > 200 and g > 200 and b > 200,
]  # White

# color bars are inverted for OV7725
if sensor.get_id() == sensor.OV7725:
    t = t[::-1]

# 320x240 image with 8 color bars each one is approx 40 pixels.
# we start from the center of the frame buffer, and average the
# values of 10 sample pixels from the center of each color bar.
for i in range(0, 8):
    avg = (0, 0, 0)
    idx = 40 * i + 20  # center of colorbars
    for off in range(0, 10):  # avg 10 pixels
        rgb = image.get_pixel(idx + off, 120)
        avg = tuple(map(sum, zip(avg, rgb)))

    if not t[i](avg[0] / 10, avg[1] / 10, avg[2] / 10):
        raise Exception(
            "COLOR BARS TEST FAILED."
            "BAR#(%d): RGB(%d,%d,%d)"
            % (i + 1, avg[0] / 10, avg[1] / 10, avg[2] / 10)
        )

print("COLOR BARS TEST PASSED...")

      if name == "main":
      print("")
      test_int_adc()
      test_color_bars()

      0