| The application of digital image processing technology in preprocess module of drawings computer management system has been studied thoroughly in this thesis . The matter of disequilibria between brightness and darkness has been resolved by adjusting of gray-scale The kinds of drawing noises and background has been studied in detail based on analyzing all kinds of methods of noises removing , and a principle about noises removing of drawing is presented . After introducing all kinds of threshold methods , the principle about background removing is presented . Realized the pseudo-color transformation of gray-scale drawing . The application of morphological in noises removing , lines classification , and edge detection of drawing has been studied . Finally , on the base of analyzing classical edge detection methods , a fast binary edge detection has been presented.
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