imager: add support for white balance

scripts/planktoscope/imager.py

@@ -126,7 +126,7 @@ class ImagerProcess(multiprocessing.Process):
     """This class contains the main definitions for the imager of the PlanktoScope"""
 
     @logger.catch
-    def __init__(self, stop_event, iso=100, shutter_speed=500):
+    def __init__(self, stop_event, iso=200, shutter_speed=20):
         """Initialize the Imager class
 
         Args:
@@ -188,6 +188,12 @@ class ImagerProcess(multiprocessing.Process):
         self.__iso = iso
         self.__shutter_speed = shutter_speed
         self.__exposure_mode = "fixedfps"
+        self.__white_balance = "off"
+        self.__white_balance_gain = (
+            200,
+            140,
+        )  # Those values were tested on a HQ camera to give a whitish background
+
         self.__base_path = "/home/pi/data/img"
         # Let's make sure the base path exists
         if not os.path.exists(self.__base_path):
@@ -231,6 +237,24 @@ class ImagerProcess(multiprocessing.Process):
                 "A timeout has occured when setting the exposure mode, trying again"
             )
             self.__camera.exposure_mode = self.__exposure_mode
+        time.sleep(0.1)
+
+        try:
+            self.__camera.white_balance = self.__white_balance
+        except TimeoutError as e:
+            logger.error(
+                "A timeout has occured when setting the white balance mode, trying again"
+            )
+            self.__camera.white_balance = self.__white_balance
+        time.sleep(0.1)
+
+        try:
+            self.__camera.white_balance_gain = self.__white_balance_gain
+        except TimeoutError as e:
+            logger.error(
+                "A timeout has occured when setting the white balance gain, trying again"
+            )
+            self.__camera.white_balance_gain = self.__white_balance_gain
 
         logger.success("planktoscope.imager is initialised and ready to go!")
 
@@ -324,6 +348,9 @@ class ImagerProcess(multiprocessing.Process):
                 "acq_camera_iso": self.__iso,
                 "acq_camera_shutter_speed": self.__shutter_speed,
             }
+            # TODO add here the field size metadata
+            # For cam HQ 4,15mm x 3,14mm, résolution 1µm/px
+            # For cam 2.1 2.31mm x 1,74mm, résolution 0.7µm/px
             # Concat the local metadata and the metadata from Node-RED
             self.__global_metadata = {**local_metadata, **nodered_metadata}
 

scripts/planktoscope/light.py

@@ -8,7 +8,7 @@
 # Library to send command over I2C for the light module on the fan
 import smbus
 import RPi.GPIO
-import subprocess
+import subprocess  # nosec
 
 # define the bus used to actuate the light module on the fan
 bus = smbus.SMBus(1)
@@ -22,25 +22,26 @@ rgb_off_reg = 0x07
 ################################################################################
 # LEDs functions
 ################################################################################
+
+
+def i2c_update():
+    # Update the I2C Bus in order to really update the LEDs new values
+    subprocess.Popen("i2cdetect -y 1".split(), stdout=subprocess.PIPE)  # nosec
+
+
 def setRGB(R, G, B):
     """Update all LED at the same time"""
     bus.write_byte_data(DEVICE_ADDRESS, 0x00, 0xFF)
     bus.write_byte_data(DEVICE_ADDRESS, 0x01, R & 0xFF)
     bus.write_byte_data(DEVICE_ADDRESS, 0x02, G & 0xFF)
     bus.write_byte_data(DEVICE_ADDRESS, 0x03, B & 0xFF)
-
-    # Update the I2C Bus in order to really update the LEDs new values
-    cmd = "i2cdetect -y 1"
-    subprocess.Popen(cmd.split(), stdout=subprocess.PIPE)
+    i2c_update()
 
 
 def setRGBOff():
     """Turn off the RGB LED"""
     bus.write_byte_data(DEVICE_ADDRESS, 0x07, 0x00)
-
-    # Update the I2C Bus in order to really update the LEDs new values
-    cmd = "i2cdetect -y 1"
-    subprocess.Popen(cmd.split(), stdout=subprocess.PIPE)
+    i2c_update()
 
 
 def setRGBEffect(effect):
@@ -88,6 +89,10 @@ def light(state):
         RPi.GPIO.output(21, RPi.GPIO.LOW)
 
 
+## Wait message: Green
+## Actuate message: White
+## Pumping message: Blue
+
 # This is called if this script is launched directly
 if __name__ == "__main__":
     # TODO This should be a test suite for this library

scripts/planktoscope/raspimjpeg.py

@@ -25,6 +25,7 @@ class raspimjpeg(object):
         self.__binary = "/home/pi/PlanktonScope/scripts/raspimjpeg/bin/raspimjpeg"
         self.__statusfile = "/dev/shm/mjpeg/status_mjpeg.txt"
         self.__pipe = "/home/pi/PlanktonScope/scripts/raspimjpeg/FIFO"
+        self.__sensor_name = ""
 
         # make sure the status file exists and is empty
         if not os.path.exists(self.__statusfile):
@@ -374,6 +375,32 @@ class raspimjpeg(object):
             )
             raise ValueError
 
+    @property
+    def white_balance_gain(self):
+        return self.__white_balance_gain
+
+    @white_balance_gain.setter
+    def white_balance_gain(self, gain):
+        """Change the camera white balance gain
+
+            The gain value should be a int between 0 and 300. By default the camera
+            is set to use 150 both for the red and the blue gain.
+
+        Args:
+            gain (tuple of int): Red gain and blue gain to use
+        """
+        logger.debug(f"Setting the white balance mode to {gain}")
+        if (0 < gain[0] < 300) and (0 < gain[1] < 300):
+            self.__white_balance_gain = gain
+            self.__send_command(
+                f"ag {self.__white_balance_gain[0]} {self.__white_balance_gain[1]}"
+            )
+        else:
+            logger.error(
+                f"The camera white balance gain specified ({gain}) is not valid"
+            )
+            raise ValueError
+
     @property
     def image_quality(self):
         return self.__image_quality

scripts/raspimjpeg/raspimjpeg.conf

@@ -89,7 +89,7 @@ MP4Box_cmd (set -e;MP4Box -fps %i -add %s %s > /dev/null 2>&1;rm "%s";) &
 #
 image_width 3280
 image_height 2464
-image_quality 25
+image_quality 80
 
 #time lapse interval 0.1 sec units
 tl_interval 30