1. A method comprising: capturing strokes written on a screen over a first document image while the document image is being displayed; associating captured stroke data of the captured strokes with underlying image patches of the document image being displayed; determining that a second document image is being displayed on the screen; determining whether one or more image patches of the second document image, or parts thereof, had previously been associated with captured stroke data by comparing image patches of the second document image with image patches stored with captured stroke data to determine if one or more of the image patches, or parts thereof, of the second document image match at least partially an image patch currently being stored with captured stroke data; and displaying one or more previously captured strokes, or portions thereof, on image patches of the second document image based on results of determining that one or more image patches of the second document image, or parts thereof, had previously been associated with captured stroke data.