added auto_monitor=True for the image PV (otherwise callbacks do not work); height and width where switched in shape

sources.py

@@ -55,6 +55,7 @@ class Camera(PVCollection):
             width = base + ":WIDTH",
             height = base + ":HEIGHT"
         )
+        self.pvs.image.auto_monitor = True
 
     def get(self):
         data = self.pvs.image.get()
@@ -64,7 +65,9 @@ class Camera(PVCollection):
     def get_shape(self):
         width = self.pvs.width.get()
         height = self.pvs.height.get()
-        shape = (width, height)
+        width = int(round(width))
+        height = int(round(height))
+        shape = (height, width)
         return shape
 
     def add_callback(self, callback, **kwargs):