Dwengo-Website/convolutie.html at master · dwengovzw/Dwengo-Website · GitHub

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---
permalink: /convolutie/
---

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Convolution Filter App</title>
    <style>
        body {
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            font-family: Arial, sans-serif;
        }
        .container {
            display: flex;
            gap: 20px;
        }
        canvas {
            border: 1px solid black;
        }
        .filters {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .filter {
            padding: 10px;
            border: 1px solid black;
            cursor: pointer;
            text-align: center;
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2px;
            width: 100px;
            justify-content: center;
        }
        .filter div {
            padding: 5px;
            text-align: center;
            border: 1px solid gray;
            background-color: lightgray;
        }
        /* Make .cell elements square */
        .cell {
            aspect-ratio: 1 / 1;
        }
        /* display the elements inside the element_column class in a flex column */
        .element_column {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        /* Center the text inside the col_title class */
        .col_title {
            text-align: center;
            font-size: medium;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="element_column">
            <h1 class="col_title">Invoer afbeelding</h1>
            <canvas id="inputCanvas" width="250" height="196"></canvas>
        </div>

        <div class="element_column">
            <h1 class="col_title">Filter</h1>
            <div class="filters" id="filters"></div>
        </div>
        <div class="element_column">
            <h1 class="col_title">Uitvoer afbeelding</h1>
            <canvas id="outputCanvas" width="250" height="196"></canvas>
        </div>
    </div>
    <script>
        const filters = [
            { name: 'Edge Detection', kernel: [-1, -1, -1, -1, 8, -1, -1, -1, -1] },
            { name: 'Blur', kernel: [1/9, 1/9, 1/9, 1/9, 1/9, 1/9, 1/9, 1/9, 1/9] },
            { name: 'Sharpen', kernel: [0, -1, 0, -1, 5, -1, 0, -1, 0] },
            { name: 'Emboss', kernel: [-2, -1, 0, -1, 1, 1, 0, 1, 2] },
            { name: 'Outline', kernel: [0, 1, 0, 1, -4, 1, 0, 1, 0] }
        ];

        const inputCanvas = document.getElementById('inputCanvas');
        const outputCanvas = document.getElementById('outputCanvas');
        const ctxInput = inputCanvas.getContext('2d');
        const ctxOutput = outputCanvas.getContext('2d');

        const filtersDiv = document.getElementById('filters');

        function fractionFormat(value) {
            if (value === 1/9) return '1/9';
            if (value === -1/9) return '-1/9';
            if (Number.isInteger(value)) return value.toString();
            return value.toFixed(2);
        }

        filters.forEach(filter => {
            const filterDiv = document.createElement('div');
            filterDiv.classList.add('filter');
            filterDiv.onclick = () => applyFilter(filter.kernel);

            filter.kernel.forEach(value => {
                const cell = document.createElement('div');
                cell.classList.add('cell');
                cell.textContent = fractionFormat(value);
                filterDiv.appendChild(cell);
            });

            filtersDiv.appendChild(filterDiv);
        });

        const img = new Image();
        img.src = '/assets/images/convolutie/igent.png'; // Example B/W image
        img.crossOrigin = "anonymous";
        img.onload = () => {
            ctxInput.drawImage(img, 0, 0, inputCanvas.width, inputCanvas.height);
        };

        function applyFilter(kernel) {
            const imageData = ctxInput.getImageData(0, 0, inputCanvas.width, inputCanvas.height);
            const data = imageData.data;
            const width = imageData.width;
            const height = imageData.height;
            const outputData = ctxOutput.createImageData(width, height);
            const outputPixels = outputData.data;

            for (let y = 1; y < height - 1; y++) {
                for (let x = 1; x < width - 1; x++) {
                    let r = 0, g = 0, b = 0;
                    let index = (y * width + x) * 4;

                    for (let ky = -1; ky <= 1; ky++) {
                        for (let kx = -1; kx <= 1; kx++) {
                            let pixelIndex = ((y + ky) * width + (x + kx)) * 4;
                            let weight = kernel[(ky + 1) * 3 + (kx + 1)];
                            r += data[pixelIndex] * weight;
                            g += data[pixelIndex + 1] * weight;
                            b += data[pixelIndex + 2] * weight;
                        }
                    }
                    outputPixels[index] = Math.min(Math.max(r, 0), 255);
                    outputPixels[index + 1] = Math.min(Math.max(g, 0), 255);
                    outputPixels[index + 2] = Math.min(Math.max(b, 0), 255);
                    outputPixels[index + 3] = 255;
                }
            }
            ctxOutput.putImageData(outputData, 0, 0);
        }
    </script>
</body>
</html>