openmv/scripts/examples/03-Camera/04-Global-Shutter/triggered_mode.py
2022-07-02 20:14:23 +02:00

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1.7 KiB
Python

# Global Shutter Triggered Mode Example
#
# This example shows off setting the global shutter camera into triggered mode. In triggered mode
# snapshot() controls EXACTLY when integration of the camera pixels start such that you can sync
# taking pictures to some external movement. Since the camera captures all pixels at the same time
# (as it is a global shutter camera versus a rolling shutter camera) movement in the image will
# only be captured for the integration time and not the integration time multipled by the number
# of rows in the image. Additionally, sensor noise is reduced in triggered mode as the camera will
# not read out rows until after exposing which results in a higher quality image.
#
# That said, your maximum frame rate will be reduced by 2 to 3 as frames are no longer generated
# continously by the camera and because you have to wait for the integration to finish before
# readout of the frame.
import sensor, image, time
sensor.reset() # Reset and initialize the sensor.
sensor.set_pixformat(sensor.GRAYSCALE) # Set pixel format to GRAYSCALE
sensor.set_framesize(sensor.VGA) # Set frame size to VGA (640x480)
sensor.skip_frames(time = 2000) # Wait for settings take effect.
clock = time.clock() # Create a clock object to track the FPS.
sensor.ioctl(sensor.IOCTL_SET_TRIGGERED_MODE, True)
while(True):
clock.tick() # Update the FPS clock.
img = sensor.snapshot() # Take a picture and return the image.
print(clock.fps()) # Note: OpenMV Cam runs about half as fast when connected
# to the IDE. The FPS should increase once disconnected.