如何用OpenCV实现的文档矫正？

使用 OpenCV 进行文档矫正 本文只发布于博客园与pchar博客 std::vector<std::vector<cv::Point>> cvhelper::findCorners(const cv::Mat &image) { cv::Mat gaussImage; cv::GaussianBlur(image, gaussImage, cv::Size(5, 5), 0); cv::threshold(gaussImage, gaussImage, 0, 255, cv::THRESH_BINARY | cv::THRESH_OTSU); cv::Canny(gaussImage, gaussImage, 50, 200); cv::morphologyEx(gaussImage, gaussImage, cv::MORPH_CLOSE, cv::Mat::ones(5, 5, CV_32F)); std::vector<std::vector<cv::Point>> contours; std::vector<cv::Vec4i> hierarchy; cv::findContours(gaussImage, contours, hierarchy, cv::RETR_LIST, cv::CHAIN_APPROX_SIMPLE); std::vector<std::vector<cv::Point>> ret; for (auto &contour: contours) { double peri = cv::arcLength(contour, true); std::vector<cv::Point> approx; cv::approxPolyDP(contour, approx, 0.05 * peri, true); if (approx.size() == 4 && cv::isContourConvex(approx) && cv::contourArea(approx) > 1000) { ret.push_back(approx); } } return ret; } void cvhelper::GetDocumentRect(cv::Mat &src, std::vector<cv::Point> &ret_points) { int shrunkImageHeight = 500; cv::Mat shrunkImage; cv::resize(src, shrunkImage, cv::Size(shrunkImageHeight * src.cols / src.rows, shrunkImageHeight)); cv::cvtColor(shrunkImage, shrunkImage, cv::COLOR_BGR2Luv); std::vector<cv::Mat> channels; cv::split(shrunkImage, channels); std::vector<std::vector<cv::Point>> documentCorners; for (const auto &channel: channels) { std::vector<std::vector<cv::Point>> corners = findCorners(channel); if (!corners.empty()) { double maxArea = 0.0; std::vector<cv::Point> maxAreaContourIt;