Are you trying to plot eight different images in eight different plot views? In your update method you are only setting the image for self.img which is the one image view. One way is to have eight different image views and pass the index of the one you want to update via your signal. If this is your layout, then I think you should use a GraphicsLayoutWidget with a GraphicsLayout and your items inside ( http://www.pyqtgraph.org/documentation/plotting.html).
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