opencvjs-document-scanner/index.html at main · tony-xlh/opencvjs-document-scanner · GitHub

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<!doctype html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <link rel="icon" type="image/svg+xml" href="/vite.svg" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <script src="/dynamsoft-document-viewer/ddv.js"></script>
    <link rel="stylesheet" href="/dynamsoft-document-viewer/ddv.css">
    <script src="https://cdn.jsdelivr.net/npm/eruda"></script>
    <script>eruda.init();</script>
    <title>OpenCV Document Scanner</title>
    <style>
      #app {
        display: flex;
        flex-direction: column;
        align-items: center;
      }

      .result {
        display: flex;
      }

      .original, .processed {
        flex-basis: 50%;
      }

      #output, #photo {
        max-width: 100%;
      }

      .fullscreen {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
      }

      .captureViewer, .perspectiveViewer {
        display: none;
      }
    </style>
  </head>
  <body>
    <div id="app">
      <h2>OpenCV Document Scanner</h2>
      <div id="status">Loading OpenCV...</div>
      <div>
        <button id="loadFileBtn">
          Load File
        </button>
        <button id="detectBtn">
          Detect
        </button>
        <button id="liveScanBtn">
          Live Scan
        </button>
      </div>
      <div>
        <label>
          Enable Editing:
          <input type="checkbox" id="enableEditing"/>
        </label>
        <input style="display:none;" type="file" id="file" onchange="loadImageFromFile();" accept=".jpg,.jpeg,.png,.bmp" />
      </div>
      <div>
        <label>
          Enable Canny Edge Detection:
          <input type="checkbox" id="enableCanny"/>
        </label>
      </div>
      <div class="result">
        <div class="original">
          <img id="photo"/>
          <img id="photoRaw" style="display:none;"/>
        </div>
        <div class="processed">
          <img id="output"/>
        </div>
      </div>
      <div>
        <div id="captureViewer" class="fullscreen"></div>
        <div id="perspectiveViewer" class="fullscreen"></div>
      </div>
    </div>
    <script type="text/javascript">
      let documentScanner;
      let captureViewer;
      let perspectiveViewer;
      let docManager;
      let doc;
      let detectHander;
      initDDV();

      var Module = {
        // https://emscripten.org/docs/api_reference/module.html#Module.onRuntimeInitialized
        onRuntimeInitialized() {
          documentScanner = new DocumentScanner();
          document.getElementById('status').innerHTML = 'OpenCV.js is ready.';
          detectHandler = new OpenCVDocumentDetectHandler(documentScanner);
          Dynamsoft.DDV.setProcessingHandler("documentBoundariesDetect", detectHandler);
        }
      };

      async function initDDV(){
        Dynamsoft.DDV.Core.license = "DLS2eyJvcmdhbml6YXRpb25JRCI6IjIwMDAwMSJ9"; // Public trial license which is valid for 24 hours
        Dynamsoft.DDV.Core.engineResourcePath = "/dynamsoft-document-viewer/engine";// Lead to a folder containing the distributed WASM files
        await Dynamsoft.DDV.Core.loadWasm();
        await Dynamsoft.DDV.Core.init();
        docManager = Dynamsoft.DDV.documentManager;
        doc = docManager.createDocument({
          name: "doc"
        });
        captureViewer = new Dynamsoft.DDV.CaptureViewer({
          container: document.getElementById("captureViewer"),
          viewerConfig: {
            enableAutoCapture: false,
            enableAutoDetect: true
          }
        });
        const cameras = await captureViewer.getAllCameras();
        for (var i=0;i<cameras.length;i++)
        {
            if(cameras[i].label.indexOf("OBS") != -1){ //for desktop testing
                captureViewer.selectCamera(cameras[i]);
                break;
            }
        }

        captureViewer.on("captured", async (e) => {
            // Stop video stream and hide capture viewer's container
            captureViewer.stop();
            document.getElementById("captureViewer").style.display = "none";
            const pageData =  captureViewer.currentDocument.getPageData(e.pageUid);
            const raw = await pageData.raw();
            // Original image
            let url = URL.createObjectURL(raw.data);
            document.getElementById("photo").src = url;
            await loadImage(document.getElementById("photoRaw"), url);
            if (document.getElementById("enableEditing").checked) {
              let points = documentScanner.detect(document.getElementById("photoRaw"),getScanOptions());
              await loadImageToDoc(document.getElementById("photoRaw").src);
              showPerspectiveViewer(points);
            }else{
              getCroppedImage();
              captureViewer.currentDocument.deleteAllPages();
            }
        });
        perspectiveViewer = new Dynamsoft.DDV.PerspectiveViewer({
          container: document.getElementById("perspectiveViewer"),
          uiConfig: isMobile()? mobilePerspectiveUiConfig : pcPerspectiveUiConfig
        });
        perspectiveViewer.on("done", async () => {
          const quad = perspectiveViewer.getQuadSelection();
          const points = [];
          quad.forEach(p => {
            points.push({x:p[0],y:p[1]})
          });
          getCroppedImage(points);
          document.getElementById("perspectiveViewer").style.display = "none";
          perspectiveViewer.currentDocument.deleteAllPages();
        });
        captureViewer.openDocument(doc.uid);
        perspectiveViewer.openDocument(doc.uid);
      }

      document.getElementById("loadFileBtn").addEventListener("click",function(){
        document.getElementById("file").click();
      })
      document.getElementById("detectBtn").addEventListener("click",async function(){
        let points = documentScanner.detect(document.getElementById("photoRaw"),getScanOptions());
        if (document.getElementById("enableEditing").checked) {
          await loadImageToDoc(document.getElementById("photoRaw").src);
          showPerspectiveViewer(points);
        }else{
          getCroppedImage(points);
        }

      })
      document.getElementById("liveScanBtn").addEventListener("click",function(){
        if (captureViewer) {
          detectHandler.setScanOptions(getScanOptions());
          document.getElementById("captureViewer").style.display = "block";
          captureViewer.play({fill:true});
        }
      })

      function getCroppedImage(points){
        let canvas = documentScanner.crop(document.getElementById("photoRaw"),points);
        document.getElementById("output").src = canvas.toDataURL();
      }

      async function loadImageToDoc(dataURL) {
        const response = await fetch(dataURL);
        const blob = await response.blob();
        await doc.loadSource(blob);
      }

      function showPerspectiveViewer(points){
        document.getElementById("perspectiveViewer").style.display = "block";
        const quad = [];
        points.forEach(point => {
          quad.push([point.x,point.y]);
        });
        console.log(quad);
        perspectiveViewer.setQuadSelection(quad);
      }

      async function loadImage(img,src) {
        return new Promise((resolve, reject) => {
          img.onload = function(){
            resolve();
          }
          img.src = src;
        })
      }

      function loadImageFromFile(){
        let fileInput = document.getElementById("file");
        let files = fileInput.files;
        if (files.length == 0) {
          return;
        }
        let file = files[0];
        fileReader = new FileReader();
        fileReader.onload = function(e){
          document.getElementById("photo").src = e.target.result;
          document.getElementById("photoRaw").src = e.target.result;
        };
        fileReader.onerror = function () {
          console.warn('oops, something went wrong.');
        };
        fileReader.readAsDataURL(file);
      }

      function isMobile(){
        return "ontouchstart" in document.documentElement;
      }

      const mobilePerspectiveUiConfig = {
        type: Dynamsoft.DDV.Elements.Layout,
        flexDirection: "column",
        children: [
            {
                type: Dynamsoft.DDV.Elements.Layout,
                className: "ddv-perspective-viewer-header-mobile",
                children: [
                    {
                        // Bind event for "PerspectiveAll" button
                        // The event will be registered later.
                        type: Dynamsoft.DDV.Elements.PerspectiveAll,
                        events:{
                            click: "done"
                        }
                    },
                ],
            },
            Dynamsoft.DDV.Elements.MainView
        ],
    };

    //Pc PerspectiveViewer
    const pcPerspectiveUiConfig = {
        type: Dynamsoft.DDV.Elements.Layout,
        flexDirection: "column",
        children: [
            {
                type: Dynamsoft.DDV.Elements.Layout,
                className: "ddv-perspective-viewer-header-desktop",
                children: [
                    {
                        // Bind event for "PerspectiveAll" button
                        // The event will be registered later.
                        type: Dynamsoft.DDV.Elements.PerspectiveAll,
                        className: "ddv-perspective-viewer-perspective-desktop",
                        events:{
                            click: "done"
                        }
                    },
                ],
            },
            Dynamsoft.DDV.Elements.MainView,
        ],
    };

    function getScanOptions(){
      let options = {};
      if(document.getElementById("enableCanny").checked){
        options.useCanny = true;
      }else{
        options.useCanny = false;
      }
      return options;
    }
    </script>
    <script type="module" src="/src/main.ts"></script>
    <script async src="/opencv.js" type="text/javascript"></script>
  </body>
</html>