Add exposure compensation options

start_tx.sh

@@ -33,6 +33,11 @@ TX_IMAGE_SCALING=0.5
 # Allowed Values: Auto, Daylight, Cloudy, Incandescent, Tungesten, Fluorescent, Indoor
 WHITEBALANCE=Auto
 
+# Exposure compensation
+# Allowed values: -8.0 to 8.0
+# You may wish to adjust this to bump up the exposure a little.
+EXPOSURE=0.0
+
 # Refer near the end of this file for image flipping and overlay options
 
 # Baud Rate
@@ -122,5 +127,5 @@ python3 tx_picamera2_gps.py \
     --gps $GPSPORT \
     --resize $TX_IMAGE_SCALING \
     --whitebalance $WHITEBALANCE \
-    --vflip --hflip \
+    --exposure $EXPOSURE \
     $MYCALL

tx/WenetPiCamera2.py

@@ -55,6 +55,7 @@ class WenetPiCamera2(object):
                 lens_position = -1,
                 af_window = None,
                 af_offset = 0,
+                exposure_value = 0.0,
                 temp_filename_prefix = 'picam_temp',
                 debug_ptr = None,
                 init_retries = 10
@@ -106,6 +107,7 @@ class WenetPiCamera2(object):
         self.lens_position = lens_position
         self.af_window = af_window
         self.af_offset = af_offset
+        self.exposure_value = exposure_value
         self.af_window_rectangle = None # Calculated during init
         self.autofocus_mode = False
 
@@ -201,7 +203,8 @@ class WenetPiCamera2(object):
 
         self.cam.set_controls(
             {'AwbMode': self.whitebalance,
-            'AeMeteringMode': controls.AeMeteringModeEnum.Matrix
+            'AeMeteringMode': controls.AeMeteringModeEnum.Matrix,
+            'ExposureValue': self.exposure_value
             #'NoiseReductionMode': controls.draft.NoiseReductionModeEnum.Off
             }
             )
@@ -267,7 +270,8 @@ class WenetPiCamera2(object):
         # TODO - Maybe expose some of these settings?
         self.cam.set_controls(
             {'AwbMode': self.whitebalance,
-            'AeMeteringMode': controls.AeMeteringModeEnum.Matrix
+            'AeMeteringMode': controls.AeMeteringModeEnum.Matrix,
+            'ExposureValue': self.exposure_value
             #'NoiseReductionMode': controls.draft.NoiseReductionModeEnum.Off
             }
             )

tx/tx_picamera2_gps.py

@@ -35,6 +35,7 @@ parser.add_argument("--whitebalance", type=str, default='daylight', help="White
 parser.add_argument("--lensposition", type=float, default=-1.0, help="For PiCam v3, set the lens position. Default: -1 = Continuous Autofocus")
 parser.add_argument("--afwindow", type=str, default=None, help="For PiCam v3 Autofocus mode, set the AutoFocus window, x,y,w,h , in fractions of frame size. (Default: None = default)")
 parser.add_argument("--afoffset", type=float, default=0.0, help="For PiCam v3 Autofocus mode, offset the lens by this many dioptres (Default: 0 = No offset)")
+parser.add_argument("--exposure", type=float, default=0.0, help="Exposure compensation. -8.0 to 8.0. Sets the ExposureValue control. (Default: 0.0)")
 parser.add_argument("-v", "--verbose", action='store_true', default=False, help="Show additional debug info.")
 args = parser.parse_args()