(feat SensorModelling) add pixel_order field

osi_sensorview.proto

@@ -313,8 +313,10 @@ message CameraSensorView
 
     // Raw image data.
     //
-    // The raw image data in the memory layout and order specified by the
-    // camera sensor input configuration.
+    // The raw image data in the memory layout specified by the camera    
+    // sensor input configuration. The pixel order is specified in 
+    // CameraSensorViewConfiguration.pixel_order with the 
+    // default value PIXEL_ORDER_DEFAULT (i.e. left-to-right, top-to-bottom).
     //
     optional bytes image_data = 2;
 }

osi_sensorviewconfiguration.proto

@@ -729,6 +729,53 @@ message CameraSensorViewConfiguration
     //
     repeated WavelengthData wavelength_data = 11;
 
+    // Indicates if and how the the pixel data is ordered
+    //
+    // The default value (PIXEL_ORDER_DEFAULT) indicates standard image
+    // pixel order (left-to-right, top-to-bottom). The other values can
+    // be used to indicate/request mirroring (right to left or bottom to top).
+    // 
+    // \note For rotations of the pixel data, use the camera coordinate system.
+    //
+    optional PixelOrder pixel_order = 12;
+
+    // Pixel layout 
+    //
+    // Pixel layout documents the order of pixels in the \c image_data
+    // in CameraSensorView. 
+    //
+    // \note this enum does not contain an entry to do mirroring upside down
+    // and left-to-right at the same time, because this is equivalent to a
+    // 180-degree rotation, which should be indicated in the sensor coordinate
+    // system.
+    //
+    enum PixelOrder
+    {
+        // Pixel data is not mirrored (Default).
+        // Pixels are ordered left-to-right, top-to-bottom.
+        //
+        PIXEL_ORDER_DEFAULT = 0;
+
+        // Known pixel order that is not supported by OSI.
+        // Consider proposing an additional format if using
+        // \c #PIXEL_ORDER_OTHER.
+        //
+        PIXEL_ORDER_OTHER = 1;
+
+        // Pixels are ordered right-to-left, top-to-bottom.
+        // Pixel data is mirrored along the vertical axis.
+        // The image is mirrored left-to-right.
+        //
+        PIXEL_ORDER_RIGHT_LEFT_TOP_BOTTOM = 2;
+
+        // Pixels are ordered left-to-right, bottom-to-top.
+        // Pixel data is mirrored along the horizontal axis.
+        // The image is mirrored top-to-bottom.
+        // 
+        PIXEL_ORDER_LEFT_RIGHT_BOTTOM_TOP = 3;
+    }
+
+
     // Channel format.
     //
     enum ChannelFormat