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barcode-scanner
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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Barcode Scanner</title>
    <link rel="stylesheet" href="styles.css">
</head>
<body>
    <div class="container">
        <h1>Barcode Scanner</h1>
        <div class="upload-section">
            <label for="imageUpload" class="upload-label">
                <span>Upload Image with Barcode</span>
                <input type="file" id="imageUpload" accept="image/*">
            </label>
        </div>
        
        <div class="preview-section">
            <div class="image-preview">
                <h2>Image Preview</h2>
                <div id="scanner-container">
                    <img id="preview" src="#" alt="Preview" style="display: none;">
                    <canvas id="scanCanvas"></canvas>
                </div>
            </div>
            
            <div class="result-section">
                <h2>Recognition Result</h2>
                <div id="status">Upload an image or use camera to start recognition</div>
                <div id="result"></div>
            </div>
        </div>
        
        <div class="info-section">
            <h3>How It Works</h3>
            <p>This application uses ZXing (Zebra Crossing), a powerful barcode scanning library, to detect and decode barcodes from images or your device camera.</p>
            <p>For best results:</p>
            <ul>
                <li>Use clear, well-lit images or good lighting when using camera</li>
                <li>Ensure the barcode is in focus</li>
                <li>Position the barcode to be as straight as possible</li>
                <li>Hold the camera steady when scanning with device camera</li>
                <li>Supported formats: QR Code, Data Matrix, UPC, EAN, Code 128, Code 39, ITF, and more</li>
            </ul>
        </div>
        
        <div class="troubleshooting-section">
            <h3>Troubleshooting</h3>
            <p>If you're having trouble with barcode recognition:</p>
            <ol>
                <li><strong>Image Quality:</strong> Make sure your image is clear, well-lit, and the barcode is in focus.</li>
                <li><strong>Camera Position:</strong> When using the camera, hold it steady and ensure good lighting.</li>
                <li><strong>Barcode Type:</strong> This scanner supports both 1D barcodes (EAN, UPC, Code128, etc.) and 2D barcodes (QR Code, Data Matrix).</li>
                <li><strong>Orientation:</strong> ZXing can detect barcodes in various orientations, but straight alignment may improve results.</li>
                <li><strong>Contrast:</strong> Ensure there's good contrast between the barcode and background.</li>
                <li><strong>Size:</strong> The barcode should be a reasonable size in the image - not too small or too large.</li>
                <li><strong>Different Image:</strong> If all else fails, try a different image of the barcode.</li>
                <li><strong>Camera Permissions:</strong> Make sure you've granted camera permissions if using the camera feature.</li>
            </ol>
            <p>Red boxes indicate detected barcode areas.</p>
        </div>
    </div>

    <!-- Load ZXing library -->
    <script src="https://unpkg.com/@zxing/library@latest"></script>
    <script src="app.js"></script>
</body>
</html>