ocrd_utils: allow scaling images #707
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This aids image up- or downsampling in processors. For the beginning, processors must do this strictly locally (i.e. undo its effects before annotating new images), because there we still do not have a way to represent scale factor in PAGE-XML. But even now it would be helpful to make full use of the local coordinate system (
transform) transparently.For a full (but unrealistic) example, see here.