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Image processing method and apparatus

posted on 2023-06-07, 20:36 authored by Chris ChatwinChris Chatwin, Rupert YoungRupert Young, Frederic Vladimir Claret-Tournier, Karlis Harold Obrams
A pixel-based image (3) is analysed by scanning the image in a predetermined direction (15) from a predetermined point along a first edge (9) of the image towards a second edge (11). The brightness of the first pixel is determined and a value for a background value is established on the basis of the brightness of the first pixel. The brightness of each subsequent pixel is then tested in the predetermined direction (15) and, if any such subsequent pixel is found to have a value which differs substantially from the background value, substituting the tested value for the background value. After a predetermined number of tested pixels have been found to have substantially the same background value, each subsequent pixel is tested in the following manner: a value for a foreground value is established on the basis of the tested pixel if the tested pixel is found to have a value which differs from the background value by more than a predetermined amount; and a threshold value is determined on the basis of the foreground value and the background value after a predetermined number of foreground pixels and a predetermined number of background pixels have been identified.


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