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By default, for test purpose, image arrays are generated by a few methods involving random numbers.
In real case the image access method get_image( self, imageFlag, increment=None), defined in class ImgControl, needs to be overwritten in order to supply user-defined image arrays.
Example for multi-image analysis shows how to overwrite the {get_image(...)}} in user code. The input parameter imageFlag may take three values self.icp.imagePrevious, self.icp.imageCurrent, or self.icp.imageNext, depending on which button in the GUI is clicked, left arrow, Current, or right arrow, respectively. The increment value, also defined in the GUI, may be used as a parameter in transition to the next or previous image.

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