工程图扫描识别，利用膨胀和腐蚀特点及粒度测定法对图像处理和筛分，包括设备图符分层筛分，设备图符方向识别，缆线识别，最后将识别设备以图形方式综合输出形成电子图-Engineering Drawings identification, use of dilation and erosion characteristics and particle size determination method, image processing and screening, including equipmen