Qt Picture Correction (2)

Sketch

PDF to Picture Code

PDF to Picture Code <----- Download PDF to Picture Code, click here

//In the PDF to Picture section, I applied a third-party library.Then I encapsulated it myself
//WcharPdfFile: PDF file path;
//imageName: Outgoing Picture Path
//PageNum:PDFThe number of pages
bool CPdf2PngDll::PdfToPng(const wchar_t* wcharPdfFile, const char* imageName, int &pageNum)
{
    CMuPDFConvert pdfConvert;
    return pdfConvert.Pdf2Png(wcharPdfFile, imageName, pageNum);
}

//Note here that imageName: The output path is a dead png format picture, and passing in parameters to the path of all folders is sufficient, such as output asTest.pngPicture imageName = D:\OfficeWare\test; that's it
bool CMuPDFConvert::Pdf2Png(const wchar_t* wcharPdfFile,const char* imageName, int &pageNum)
{
    char tempPath[1024];
    strcpy_s(tempPath, imageName);
    strcat_s(tempPath, "%d.png");
. . . . . . . . . . . Later, check the source I uploaded, which is omitted.The main purpose is to illustrate the parameter problem.
}

Opencv Picture Correction

#include "opencv2/opencv.hpp"

using namespace std;
std::vector<std::vector<cv::Point>> contours;

void CImageRotationDll::ImageRotationStart(const std::string& inputPath, const std::string& outputPath)
{
    auto FNsearchQR = [&](cv::Mat image)
    {
        cv::Mat imageGray, imageROI, imageGuussian, imageSobelX, imageSobelY, imageSobelOut;
        //2. Convert to Grayscale  
        cvtColor(image, imageGray, CV_RGB2GRAY);
        imageROI = imageGray(cv::Range(image.rows - 80, image.rows), cv::Range(image.cols - 450, image.cols));
        //3. Gauss Smoothing Filter  
        GaussianBlur(imageROI, imageGuussian, cv::Size(3, 3), 0);

        //4. Find the gradient difference between horizontal and vertical gray-scale images using Sobel operator  
        cv::Mat imageX16S, imageY16S;
        Sobel(imageGuussian, imageX16S, CV_16S, 1, 0, 3, 1, 0, 4);
        Sobel(imageGuussian, imageY16S, CV_16S, 0, 1, 3, 1, 0, 4);
        convertScaleAbs(imageX16S, imageSobelX, 1, 0);//Convert intermediate results to CV_8U
        convertScaleAbs(imageY16S, imageSobelY, 1, 0);
        imageSobelOut = imageSobelX - imageSobelY;

        //5. Mean filter to eliminate high frequency noise  
        blur(imageSobelOut, imageSobelOut, cv::Size(3, 3));

        //6. Binarization  
        cv::Mat imageSobleOutThreshold;
        threshold(imageSobelOut, imageSobleOutThreshold, 180, 255, CV_THRESH_BINARY);

        //7. Close operation, fill bar code gap  
        cv::Mat  element = cv::getStructuringElement(0, cv::Size(7, 7));
        morphologyEx(imageSobleOutThreshold, imageSobleOutThreshold, cv::MORPH_CLOSE, element);

        //8. Corrosion, removing isolated points  
        erode(imageSobleOutThreshold, imageSobleOutThreshold, element);

        //9. Expansion, filling gaps between barcodes, depending on the size of the core, may require 2-3 expansion operations  
        dilate(imageSobleOutThreshold, imageSobleOutThreshold, element);
        dilate(imageSobleOutThreshold, imageSobleOutThreshold, element);
        dilate(imageSobleOutThreshold, imageSobleOutThreshold, element);

        //10. Find the rectangular boundary of the barcode area with findContours
        vector<cv::Vec4i> hiera;
        findContours(imageSobleOutThreshold, contours, hiera, CV_RETR_EXTERNAL, CV_CHAIN_APPROX_NONE);
    };

    cv::Mat image;
    cv::Mat imagetrans;
    image = cv::imread(inputPath);
    //Search Barcode
    FNsearchQR(image);
    int index = 0;
    //Determine if barcode is detected or if not rotate 90 degrees clockwise
    while (contours.size() != 1)
    {
        index++;
        transpose(image, imagetrans);
        flip(imagetrans, image, 1);
        if (index == 3)
        {
            break;
        }
        FNsearchQR(image);
    }
    //Preservation
    cv::imwrite(outputPath, image);
    cv::waitKey();
}

Picture to PDF

#include <QPrinter>
#include <QPainter>
#include <QPageSize>

//Picture to PDF encapsulated library for my QT
void ImageToPdf::startImageToPdf(const QString& imgPath, const QString& pdfpath)
{
    QPrinter printer_pixmap(QPrinter::HighResolution);
    QPixmap pixmap(imgPath);
    printer_pixmap.setOutputFormat(QPrinter::PdfFormat);  //Set output format to pdf
    printer_pixmap.setOutputFileName(pdfpath);   //Set Output Path
    printer_pixmap.setPageSize(QPageSize(QSize(pixmap.width(), pixmap.height())));  //Set paper size to A4

    QPainter painter_pixmap;
    painter_pixmap.begin(&printer_pixmap);
    QRect rect = painter_pixmap.viewport();
    int mutipleW = rect.width() / pixmap.width();
    int mutipleH = rect.height() / pixmap.height();
    painter_pixmap.scale(mutipleW, mutipleH);

    painter_pixmap.drawPixmap(0, 0, pixmap);  //Drawing
    painter_pixmap.end();
}

summary

Continued

Qt Picture Correction (1)