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index.html
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<!DOCTYPE html>
<html>
<head>
<title>Scan and Crop Documents</title>
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum-scale=1.0,user-scalable=0" />
<script type="module">
import { defineCustomElements } from 'https://cdn.jsdelivr.net/npm/image-cropper-component@1.5.0/dist/esm/loader.js';
defineCustomElements();
</script>
<script src="https://cdn.jsdelivr.net/npm/dynamsoft-document-normalizer@1.0.12/dist/ddn.js"></script>
<script src="https://unpkg.com/dwt@18.3.0/dist/dynamsoft.webtwain.min.js"></script>
<style>
.scanner {
display: flex;
}
.options {
flex-basis: 30%;
}
.viewer {
flex-basis: 70%;
overflow: hidden;
}
.navbar {
display: flex;
align-items: center;
height: 50px;
background: black;
width: 100%;
}
body {
margin: 0;
}
.fullwidth {
width: 100%;
}
.title {
margin-left: 8px;
text-decoration: none;
color: white;
font-family: sans-serif;
font-size: larger;
text-transform: uppercase;
}
.options {
background: #F0EDE9;
}
.scanner {
height: calc(100vh - 50px);
}
.section {
padding: 8px;
}
.viewer .section {
height: calc(100% - 16px);
}
.options select {
width: 100%;
height: 30px;
}
.options div {
margin-bottom: 10px;
}
.d-primary-btn {
display: inline-block;
background-color: #fe8e14;
color: #fff;
text-align: center;
cursor: pointer;
transition: ease-in .2s all;
font-family: "sans-serif"
}
.d-primary-btn:hover {
box-shadow:-4px 4px #000;
transform: translate(4px,-4px)
}
.d-secondary-btn {
display: inline-block;
background-color: transparent;
color: #fe8e14;
text-align: center;
cursor: pointer;
font-family: "sans-serif"
}
.d-secondary-btn:hover {
color: #fea543;
}
.actions {
display: flex;
justify-content: flex-start;
align-items: center;
overflow: auto;
height: 40px;
white-space: nowrap;
}
.actions .d-primary-btn {
padding: 5px 10px;
margin-right: 5px;
}
#dwtcontrolContainer {
height: calc(100% - 40px);
}
#cropper {
display: none;
height: calc(100% - 40px);
}
.ml-10 {
margin-left: 10px;
}
@media screen and (max-device-width: 600px){
.scanner {
flex-wrap: wrap;
}
.options {
flex-basis: 100%;
}
.viewer {
flex-basis: 100%;
}
.scanner {
height: auto;
}
#dwtcontrolContainer {
height: 400px;
}
#cropper {
height: 400px;
}
}
</style>
</head>
<body>
<nav class="navbar">
<a class="title" href="#">Scan and Crop</a>
</nav>
<div class="container">
<div class="scanner">
<div class="options">
<div class="section">
<div>
<label>
Scanner:
<select id="select-scanner"></select>
</label>
</div>
<div>
<label>
Resolution:
<select id="select-resolution">
<option value="100">100</option>
<option value="200">200</option>
<option value="300" selected>300</option>
</select>
</label>
</div>
<div>
<label>
Pixel Type:
<select id="select-pixeltype">
<option>Black & White</option>
<option>Gray</option>
<option selected>Color</option>
</select>
</label>
</div>
<div>
<input type="checkbox" id="showUI"/>
<label for="showUI">
Show Scanner UI
</label>
</div>
<div>
<input type="checkbox" id="useADF"/>
<label for="useADF">
Auto Document Feeder
</label>
</div>
<div>
<input type="checkbox" id="useDuplex"/>
<label for="useDuplex">
2-side Scan
</label>
</div>
<div>
<a onclick="scan();" class="d-primary-btn fullwidth" style="padding-top:5px;padding-bottom:5px;">Scan</a>
<a onclick="loadImages();" class="d-secondary-btn fullwidth" style="margin-top:5px;">Import Local Image</a>
</div>
<div style="margin-top:2em;">
Based on <a target="_blank" href="https://www.dynamsoft.com/web-twain/overview">Dynamic Web TWAIN</a>.
</div>
</div>
</div>
<div class="viewer">
<div class="section" >
<div id="dwtcontrolContainer"></div>
<div id="cropper">
<image-cropper style="--active-stroke: 5;--active-color:orange;--inactive-color:orange;"></image-cropper>
</div>
<div class="actions">
<a class="d-primary-btn" onclick="showEditor();">Edit</a>
<a class="d-primary-btn" onclick="showCropper();">Crop</a>
<a class="d-primary-btn" onclick="autoCrop();">Auto Crop All</a>
<a class="d-primary-btn" onclick="save();">Save</a>
<label>
Output Format:
<select id="select-format">
<option>PDF</option>
<option>JPG</option>
<option>PNG</option>
</select>
</label>
<span id="status" class="ml-10"></span>
</div>
</div>
</div>
</div>
</div>
<script type="text/javascript">
let DWObject;
let scanners = [];
Dynamsoft.DWT.AutoLoad = false;
Dynamsoft.DWT.Containers = [];
Dynamsoft.DWT.ResourcesPath = "https://unpkg.com/dwt@18.3.0/dist";
Dynamsoft.DWT.ProductKey = "DLS2eyJoYW5kc2hha2VDb2RlIjoiMjAwMDAxLTE2NDk4Mjk3OTI2MzUiLCJvcmdhbml6YXRpb25JRCI6IjIwMDAwMSIsInNlc3Npb25QYXNzd29yZCI6IndTcGR6Vm05WDJrcEQ5YUoifQ=="; //one-day trial
setupCropper();
init();
function init(){
Dynamsoft.DWT.CreateDWTObjectEx(
{
WebTwainId: 'dwtcontrol'
},
function(obj) {
DWObject = obj;
DWObject.Viewer.bind(document.getElementById('dwtcontrolContainer'));
DWObject.Viewer.height = "100%";
DWObject.Viewer.width = "100%";
DWObject.Viewer.show();
DWObject.Viewer.setViewMode(2,2);
loadScanners();
},
function(err) {
console.log(err);
}
);
}
async function loadScanners(){
scanners = await DWObject.GetDevicesAsync();
console.log(scanners);
let selScanners = document.getElementById("select-scanner");
selScanners.innerHTML = "";
for (let index = 0; index < scanners.length; index++) {
const scanner = scanners[index];
let option = new Option(scanner.displayName,index);
selScanners.appendChild(option);
}
}
async function scan(){
const selectedIndex = document.getElementById("select-scanner").selectedIndex;
const options = {
IfShowUI:document.getElementById("showUI").checked,
PixelType:document.getElementById("select-pixeltype").selectedIndex,
Resolution:document.getElementById("select-resolution").selectedOptions[0].value,
IfFeederEnabled:document.getElementById("useADF").checked,
IfDuplexEnabled:document.getElementById("useDuplex").checked
};
console.log(options)
console.log(scanners[selectedIndex]);
await DWObject.SelectDeviceAsync(scanners[selectedIndex]);
await DWObject.OpenSourceAsync();
await DWObject.AcquireImageAsync(options);
await DWObject.CloseSourceAsync();
}
function loadImages(){
DWObject.IfShowFileDialog = true; //"Open File" dialog will be opened.
DWObject.LoadImageEx(
"", //file name can be empty if "Open File" dialog is called.
Dynamsoft.DWT.EnumDWT_ImageType.IT_ALL,
function () {
console.log("success");
},
function (errorCode, errorString) {
alert(errorString);
}
);
}
function setupCropper(){
const imageCropper = document.querySelector("image-cropper");
const canceled = () => {
document.getElementById("cropper").style.display = "none";
document.getElementById("dwtcontrolContainer").style.display = "";
}
const confirmed = async () => {
document.getElementById("cropper").style.display = "none";
document.getElementById("dwtcontrolContainer").style.display = "";
const selections = await imageCropper.getAllSelections();
if (selections.length>0) {
DWObject.RemoveAllSelectedImages();
}
for (let index = 0; index < selections.length; index++) {
const selection = selections[index];
let croppedImage = await imageCropper.getCroppedImage({selection:selection,perspectiveTransform:true,colorMode:"color"});
await loadImageFromDataURL(croppedImage);
}
}
const selectionClicked = async (e) => {
const index = e.detail;
let selections = await imageCropper.getAllSelections();
let selectedSelection = selections[index];
if ("width" in selectedSelection) {
imageCropper.rect = selectedSelection;
}else{
imageCropper.quad = selectedSelection;
}
selections.splice(index,1);
imageCropper.inactiveSelections = selections;
}
imageCropper.license = "DLS2eyJoYW5kc2hha2VDb2RlIjoiMjAwMDAxLTE2NDk4Mjk3OTI2MzUiLCJvcmdhbml6YXRpb25JRCI6IjIwMDAwMSIsInNlc3Npb25QYXNzd29yZCI6IndTcGR6Vm05WDJrcEQ5YUoifQ==";
imageCropper.addEventListener("canceled",canceled);
imageCropper.addEventListener("confirmed",confirmed);
imageCropper.addEventListener("selectionClicked",selectionClicked)
}
function loadImageFromDataURL(dataURL){
return new Promise((resolve, reject) => {
DWObject.LoadImageFromBase64Binary(
removeDataURLHead(dataURL),
Dynamsoft.DWT.EnumDWT_ImageType.IT_PNG,
function(){
resolve();
},
function(errorCode,errorString){
reject(errorString);
}
)
})
}
function removeDataURLHead(dataURL){
return dataURL.substring(dataURL.indexOf(",")+1,dataURL.length);
}
function showEditor(){
let imageEditor = DWObject.Viewer.createImageEditor();
imageEditor.show();
}
async function showCropper(){
const imageCropper = document.querySelector("image-cropper");
imageCropper.inactiveSelections = [];
document.getElementById("cropper").style.display = "block";
document.getElementById("dwtcontrolContainer").style.display = "none";
const base64 = await convertToBase64EncodedPNG();
const dataURL = "data:image/png;base64," + base64;
const img = document.createElement("img");
img.onload = async function(){
imageCropper.img = img;
const template = "{\"GlobalParameter\": {\"MaxTotalImageDimension\": 0,\"Name\": \"DM_Defaut_GlobalParameter\"},\"ImageParameterArray\": [{\"BaseImageParameterName\": \"\",\"BinarizationModes\": [{\"BlockSizeX\": 7,\"BlockSizeY\": 7,\"EnableFillBinaryVacancy\": 0,\"GrayscaleEnhancementModesIndex\": -1,\"LibraryFileName\": \"\",\"LibraryParameters\": \"\",\"Mode\": \"BM_LOCAL_BLOCK\",\"MorphOperation\": \"Close\",\"MorphOperationKernelSizeX\": 3,\"MorphOperationKernelSizeY\": 3,\"MorphShape\": \"Rectangle\",\"ThresholdCompensation\": 5}],\"ColourChannelUsageType\": \"CCUT_AUTO\",\"ColourConversionModes\": [{\"BlueChannelWeight\": -1,\"GreenChannelWeight\": -1,\"LibraryFileName\": \"\",\"LibraryParameters\": \"\",\"Mode\": \"CICM_GENERAL\",\"RedChannelWeight\": -1}],\"GrayscaleEnhancementModes\": [{\"LibraryFileName\": \"\",\"LibraryParameters\": \"\",\"Mode\": \"GEM_SHARPEN_SMOOTH\",\"SharpenBlockSizeX\": 3,\"SharpenBlockSizeY\": 3,\"SmoothBlockSizeX\": 3,\"SmoothBlockSizeY\": 3}],\"GrayscaleTransformationModes\": [{\"LibraryFileName\": \"\",\"LibraryParameters\": \"\",\"Mode\": \"GTM_ORIGINAL\"}],\"LineExtractionModes\": [{\"LibraryFileName\": \"\",\"LibraryParameters\": \"\",\"Mode\": \"LEM_GENERAL\"}],\"MaxThreadCount\": 4,\"Name\": \"DM_Defaut_ImageParameter\",\"NormalizerParameterName\": \"NormalizerParameter\",\"RegionPredetectionModes\": [{\"LibraryFileName\": \"\",\"LibraryParameters\": \"\",\"Mode\": \"RPM_GENERAL\"}],\"ScaleDownThreshold\": 512,\"TextFilterModes\": [{\"IfEraseTextZone\": 0,\"LibraryFileName\": \"\",\"LibraryParameters\": \"\",\"MinImageDimension\": 65536,\"Mode\": \"TFM_GENERAL_CONTOUR\",\"Sensitivity\": 0}],\"TextureDetectionModes\": [{\"LibraryFileName\": \"\",\"LibraryParameters\": \"\",\"Mode\": \"TDM_GENERAL_WIDTH_CONCENTRATION\",\"Sensitivity\": 5}],\"Timeout\": 10000}],\"NormalizerParameterArray\": [{\"Brightness\": 0,\"ColourMode\": \"ICM_COLOUR\",\"ContentType\": \"CT_DOCUMENT\",\"Contrast\": 0,\"DeskewMode\": {\"ContentDirection\": 0,\"Mode\": \"DM_PERSPECTIVE_CORRECTION\"},\"InteriorAngleRangeArray\": [{\"MaxValue\": 110,\"MinValue\": 70}],\"Name\": \"NormalizerParameter\",\"PageSize\": [-1,-1],\"QuadrilateralDetectionModes\": [{\"Mode\": \"QDM_GENERAL\"}]}]}";
updateStatus("Detecting...");
quads = await imageCropper.detect(img,template);
updateStatus("");
if (quads.length>0) {
imageCropper.quad = quads[0].location;
if (quads.length>1) {
let inactiveSelections = [];
for (let index = 1; index < quads.length; index++) {
const quad = quads[index];
inactiveSelections.push(quad.location);
}
imageCropper.inactiveSelections = inactiveSelections;
}
}else{
imageCropper.quad = {points:[{x:50,y:50},{x:250,y:50},{x:250,y:250},{x:50,y:250}]};
}
}
img.src = dataURL;
}
async function autoCrop(){
const imageCropper = document.querySelector("image-cropper");
const total = DWObject.HowManyImagesInBuffer;
let processed = 0;
let originalImagesToRemoveIndex = [];
for (let i = 0; i < total; i++) {
processed = processed + 1;
updateStatus(processed+"/"+total);
const blob = await convertToBlob(i);
const template = "{\"GlobalParameter\": {\"MaxTotalImageDimension\": 0,\"Name\": \"DM_Defaut_GlobalParameter\"},\"ImageParameterArray\": [{\"BaseImageParameterName\": \"\",\"BinarizationModes\": [{\"BlockSizeX\": 7,\"BlockSizeY\": 7,\"EnableFillBinaryVacancy\": 0,\"GrayscaleEnhancementModesIndex\": -1,\"LibraryFileName\": \"\",\"LibraryParameters\": \"\",\"Mode\": \"BM_LOCAL_BLOCK\",\"MorphOperation\": \"Close\",\"MorphOperationKernelSizeX\": 3,\"MorphOperationKernelSizeY\": 3,\"MorphShape\": \"Rectangle\",\"ThresholdCompensation\": 5}],\"ColourChannelUsageType\": \"CCUT_AUTO\",\"ColourConversionModes\": [{\"BlueChannelWeight\": -1,\"GreenChannelWeight\": -1,\"LibraryFileName\": \"\",\"LibraryParameters\": \"\",\"Mode\": \"CICM_GENERAL\",\"RedChannelWeight\": -1}],\"GrayscaleEnhancementModes\": [{\"LibraryFileName\": \"\",\"LibraryParameters\": \"\",\"Mode\": \"GEM_SHARPEN_SMOOTH\",\"SharpenBlockSizeX\": 3,\"SharpenBlockSizeY\": 3,\"SmoothBlockSizeX\": 3,\"SmoothBlockSizeY\": 3}],\"GrayscaleTransformationModes\": [{\"LibraryFileName\": \"\",\"LibraryParameters\": \"\",\"Mode\": \"GTM_ORIGINAL\"}],\"LineExtractionModes\": [{\"LibraryFileName\": \"\",\"LibraryParameters\": \"\",\"Mode\": \"LEM_GENERAL\"}],\"MaxThreadCount\": 4,\"Name\": \"DM_Defaut_ImageParameter\",\"NormalizerParameterName\": \"NormalizerParameter\",\"RegionPredetectionModes\": [{\"LibraryFileName\": \"\",\"LibraryParameters\": \"\",\"Mode\": \"RPM_GENERAL\"}],\"ScaleDownThreshold\": 512,\"TextFilterModes\": [{\"IfEraseTextZone\": 0,\"LibraryFileName\": \"\",\"LibraryParameters\": \"\",\"MinImageDimension\": 65536,\"Mode\": \"TFM_GENERAL_CONTOUR\",\"Sensitivity\": 0}],\"TextureDetectionModes\": [{\"LibraryFileName\": \"\",\"LibraryParameters\": \"\",\"Mode\": \"TDM_GENERAL_WIDTH_CONCENTRATION\",\"Sensitivity\": 5}],\"Timeout\": 10000}],\"NormalizerParameterArray\": [{\"Brightness\": 0,\"ColourMode\": \"ICM_COLOUR\",\"ContentType\": \"CT_DOCUMENT\",\"Contrast\": 0,\"DeskewMode\": {\"ContentDirection\": 0,\"Mode\": \"DM_PERSPECTIVE_CORRECTION\"},\"InteriorAngleRangeArray\": [{\"MaxValue\": 110,\"MinValue\": 70}],\"Name\": \"NormalizerParameter\",\"PageSize\": [-1,-1],\"QuadrilateralDetectionModes\": [{\"Mode\": \"QDM_GENERAL\"}]}]}";
const quads = await imageCropper.detect(blob,template);
if (quads.length > 0) {
originalImagesToRemoveIndex.push(i);
for (let j = 0; j < quads.length; j++) {
const quad = quads[j];
let croppedImage = await imageCropper.getCroppedImage({source:blob,selection:quad.location,perspectiveTransform:true,colorMode:"color"});
await loadImageFromDataURL(croppedImage);
}
}
}
originalImagesToRemoveIndex.reverse();
for (let index = 0; index < originalImagesToRemoveIndex.length; index++) {
DWObject.RemoveImage(originalImagesToRemoveIndex[index]);
}
updateStatus("Done.");
}
async function convertToBlob(index){
return new Promise((resolve, reject) => {
DWObject.ConvertToBlob(
[index],
Dynamsoft.DWT.EnumDWT_ImageType.IT_PNG,
function (result, indices, type) {
resolve(result);
},
function (errorCode, errorString) {
reject(errorString);
}
);
})
}
async function convertToBase64EncodedPNG(){
return new Promise((resolve, reject) => {
DWObject.ConvertToBase64(
[DWObject.CurrentImageIndexInBuffer],
Dynamsoft.DWT.EnumDWT_ImageType.IT_PNG,
function (result, indices, type) {
resolve(result.getData(0, result.getLength()));
},
function (errorCode, errorString) {
reject(errorString);
}
);
})
}
function save(){
let selectedIndex = document.getElementById("select-format").selectedIndex;
const onSuccess = () => {
alert("Saved");
};
const onError = (errorCode,errorString) => {
alert(errorString);
};
if (selectedIndex === 0) {
DWObject.SaveAllAsPDF("Scanned.pdf",onSuccess,onError);
}else if (selectedIndex === 1) {
DWObject.SaveAsJPEG("Scanned.jpg", DWObject.CurrentImageIndexInBuffer,onSuccess,onError);
}else if (selectedIndex === 2) {
DWObject.SaveAsPNG("Scanned.png", DWObject.CurrentImageIndexInBuffer,onSuccess,onError);
}
}
function updateStatus(status){
document.getElementById("status").innerText = status;
}
</script>
</body>
</html>