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40 lines
1.7 KiB
Python
40 lines
1.7 KiB
Python
# Sensor Manual Whitebal Control
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#
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# This example shows off how to control the camera sensor's
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# white balance gain manually versus letting the AWB control run.
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# White balance is achieve by adjusting R/G/B gain values
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# such that the average color of the image is gray. The
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# automatic white balance (AWB) algorithm does this for
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# you but usually ends up with a different result each
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# time you turn the camera on making it hard to get
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# color tracking settings right. By manually recording
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# the gain values you like and then forcing them to
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# the sensor on startup you can control the colors
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# the camera sees.
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import sensor, image, time
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sensor.reset() # Reset and initialize the sensor.
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sensor.set_pixformat(sensor.RGB565) # Set pixel format to RGB565 (or GRAYSCALE)
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sensor.set_framesize(sensor.QVGA) # Set frame size to QVGA (320x240)
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sensor.skip_frames(time = 2000) # Wait for settings take effect.
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clock = time.clock() # Create a clock object to track the FPS.
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# You can control the white balance gains here. The first value is the
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# R gain in db, and then the G gain in db, followed by the B gain in db.
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#
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# Uncomment the below line with gain values you like (get them from the print out).
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#
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# sensor.set_auto_whitebal(False, rgb_gain_db = (0.0, 0.0, 0.0))
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# Note: Putting (0.0, 0.0, 0.0) for the gain results in something close to zero
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# comming out. Do not expect the exact value going in to be equal to the value
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# comming out.
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while(True):
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clock.tick() # Update the FPS clock.
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img = sensor.snapshot() # Take a picture and return the image.
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print(clock.fps(), \
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sensor.get_rgb_gain_db()) # Prints the AWB current RGB gains.
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