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Toy Example (see text for detailed explanations). (a,d): Training Images. Black rectangle represents a hidden label. Blue and red boxes are observable features. The red box is much bigger than the blue box. Allowing for only translations, after co-registration of training images: (b,e): mean and variance images in the image-matched frame. (c,f): mean and variance images in the label-matched frame. Empty boxes denote zero variance.
