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56 lines
1.9 KiB
Python
56 lines
1.9 KiB
Python
# Colorbar Test Example
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#
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# This example is the color bar test run by each OpenMV Cam before being allowed
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# out of the factory. The OMV sensors can output a color bar image which you
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# can threshold to check the the camera bus is connected correctly.
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import sensor, time
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sensor.reset()
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# Set sensor settings
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sensor.set_brightness(0)
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sensor.set_saturation(3)
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sensor.set_gainceiling(8)
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sensor.set_contrast(2)
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# Set sensor pixel format
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sensor.set_framesize(sensor.QVGA)
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sensor.set_pixformat(sensor.RGB565)
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# Enable colorbar test mode
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sensor.set_colorbar(True)
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# Skip a few frames to allow the sensor settle down
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for i in range(0, 30):
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image = sensor.snapshot()
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# Color bars thresholds
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t = [lambda r, g, b: r < 70 and g < 70 and b < 70, # Black
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lambda r, g, b: r < 70 and g < 70 and b > 200, # Blue
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lambda r, g, b: r > 200 and g < 70 and b < 70, # Red
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lambda r, g, b: r > 200 and g < 70 and b > 200, # Purple
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lambda r, g, b: r < 70 and g > 200 and b < 70, # Green
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lambda r, g, b: r < 70 and g > 200 and b > 200, # Aqua
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lambda r, g, b: r > 200 and g > 200 and b < 70, # Yellow
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lambda r, g, b: r > 200 and g > 200 and b > 200] # White
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# color bars are inverted for OV7725
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if (sensor.get_id() == sensor.OV7725):
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t = t[::-1]
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# 320x240 image with 8 color bars each one is approx 40 pixels.
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# we start from the center of the frame buffer, and average the
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# values of 10 sample pixels from the center of each color bar.
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for i in range(0, 8):
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avg = (0, 0, 0)
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idx = 40*i+20 # center of colorbars
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for off in range(0, 10): # avg 10 pixels
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rgb = image.get_pixel(idx+off, 120)
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avg = tuple(map(sum, zip(avg, rgb)))
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if not t[i](avg[0]/10, avg[1]/10, avg[2]/10):
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raise Exception("COLOR BARS TEST FAILED. "
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"BAR#(%d): RGB(%d,%d,%d)"%(i+1, avg[0]/10, avg[1]/10, avg[2]/10))
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print("COLOR BARS TEST PASSED...")
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