In the research of image processing, this paper clears away noises to lift the image clarity aimed at the noise arisen in engineering drawing by means of mean filtering and medium filtering etc.
图像处理方面，针对工程图纸图像中出现的噪声类型，本文采用均值滤波和中值滤波等方法消除噪声，提高了图像的清晰度。
The recognition of scanned image of engineering drawing is very difficult in pattern recognition.
工程图纸扫描识别一直是模式识别中的难点问题。
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