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用opencv提取PDF或Image的图纸信息并写入DWG

用opencv提取PDF或Image的图纸信息并写入DWG
本片博文是个开端,讲述使用opencv从pdf或者图片中提取图纸信息并写入到dwg文件中的做法,由于从pdf中提取信息会先将pdf转换为opencv的Mat图片格式,所以这篇博文重点讲述从pdf中提取图纸信息。
1、从带有图纸的pdf中提取信息,首先需要能解析pdf文件并输出可以用opencv做识别的格式。
上图是一个含有图纸信息的pdf文件,博主选用了poppler开源库来解析pdf文件,poppler库可以解析pdf文件并渲染得到image数据。
cv::Mat pdfToMat(const std::string& pdfPath, int pageIdx = 0int dpi = 300) {	auto doc = poppler::document::load_from_file(pdfPath);	auto page = std::unique_ptr<poppler::page>(		doc->create_page(pageIdx)	);	poppler::page_renderer pr;	pr.set_image_format(poppler::image::format_gray8);	poppler::image img = pr.render_page(page.get(), dpi, dpi);	cv::Mat mat(		img.height(), 		img.width(), 		CV_8UC1, 		(void*)img.data(), 		img.bytes_per_row());return mat.clone();}
这里要注意渲染pdf到图时要设置格式为灰度(poppler::image::format_gray8),按RGB的默认格式渲染有点问题。
2、使用opencv对得到的cv::Mat图,进行边缘检测、轮廓查找、轮廓点集数据多边形拟合等操作得到图纸中的线等信息。
  a>  边缘检测
	cv::Mat edge;	cv::Canny(pdfMat, edge, 250300);
  b> 轮廓查找
	std::vector<std::vector<cv::Point>> contours;	std::vector<cv::Vec4i> hierarchy;	cv::findContours(		edge, 		contours, 		hierarchy, 		cv::RETR_LIST, 		cv::CHAIN_APPROX_SIMPLE);
   c> 轮廓点数据拟合
	std::vector<std::vector<cv::Point>> approxPolys;for (auto& contour : contours)	{		std::vector<cv::Point> approx;		cv::approxPolyDP(contour, approx, 2.0false);		approxPolys.push_back(approx);	}
3、将拟合得到的结果输出到DWG文件中
拟合的结果数据单位是像素,输出到dwg文件中可以设置个物理尺寸,比如这里设置X向的宽度为1000mm,Y向的宽度根据cv::Mat的宽高比计算得到
#define X_RANGE 1000double whScale = ((float)edge.rows / edge.cols);double yRange = X_RANGE * whScale;
然后循环遍历拟合数据,调用libredwg的接口写数据到dwg文件中
创建一个文档用于写数据
 //----------------------------    Dwg_Data* dwg = dwg_new_Document(R_2000, 03); //创建dwg文档    auto mspace = dwg_model_space_object(dwg);    auto hdr = mspace->tio.object->tio.BLOCK_HEADER; //-----------------------------
往文档中写数据的接口
 void DWGWriter::AddLine(cv::Point2f& pt1, cv::Point2f& pt2){    dwg_point_3d p1 = { pt1.x, pt1.y, 0.0 };    dwg_point_3d p2 = { pt2.x, pt2.y, 0.0 };    dwg_add_LINE(hdr, &p1, &p2);}
遍历拟合数据调用写数据接口
	DWGWriter writer;for (auto& approxPoly : approxPolys)	{for (int32_t index = 0; index < approxPoly.size() - 1; ++index)		{auto& curStartPt = approxPoly[index];auto& curEndPt = approxPoly[index + 1];			cv::Point2f startPoint;			cv::Point2f endPoint;			startPoint.x = ((float)curStartPt.x / edge.cols) * X_RANGE;			startPoint.y = (1.0 - (float)curStartPt.y / edge.rows) * yRange;			endPoint.x = ((float)curEndPt.x / edge.cols) * X_RANGE;			endPoint.y = (1.0 - (float)curEndPt.y / edge.rows) * yRange;			writer.AddLine(startPoint, endPoint);		}	}
最后调用dwg_write_file(dwgFile.c_str(), dwg);完成dwg写入。
4、开篇pdf文件提取数据写入到dwg文件后的效果如下
后续说明:
本文是个识别提取图纸信息的开端,内部识别的由很多碎线条以及文字的识别等后续问题需要处理。
基本 文件 流程 错误 SQL 调试
  1. 请求信息 : 2026-04-28 01:06:20 HTTP/1.1 GET : https://www.yeyulingfeng.com/a/563951.html
  2. 运行时间 : 0.331283s [ 吞吐率:3.02req/s ] 内存消耗:5,006.05kb 文件加载:145
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=881ac0cf3a944cfc8b96475ded98e9c0
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  1. CONNECT:[ UseTime:0.013552s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001001s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000456s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000378s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000735s ]
  6. SELECT * FROM `set` [ RunTime:0.000318s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000959s ]
  8. SELECT * FROM `article` WHERE `id` = 563951 LIMIT 1 [ RunTime:0.000667s ]
  9. UPDATE `article` SET `lasttime` = 1777309580 WHERE `id` = 563951 [ RunTime:0.012896s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000549s ]
  11. SELECT * FROM `article` WHERE `id` < 563951 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000838s ]
  12. SELECT * FROM `article` WHERE `id` > 563951 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001541s ]
  13. SELECT * FROM `article` WHERE `id` < 563951 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001220s ]
  14. SELECT * FROM `article` WHERE `id` < 563951 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001693s ]
  15. SELECT * FROM `article` WHERE `id` < 563951 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003859s ]
0.334247s