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<!DOCTYPE html>
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<title>Practical 1: Loading & Displaying Images | CSU2543</title>
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<meta name="author" content="Divya Mohan">
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<div class="cover-university">Shoolini University</div>
<div class="cover-dept">Faculty of Engineering & Technology<br>Department of Computer Science & Engineering</div>
<div class="cover-rule"></div>
<div class="cover-subject">Digital Image Processing</div>
<div class="cover-code">Course Code: CSU2543</div>
<div class="cover-practical">Practical 1: Loading & Displaying Images</div>
<table class="cover-table">
<tr><td>Submitted by:</td><td>Divya Mohan</td></tr>
<tr><td>Programme:</td><td>B.Tech CSE (Cybersecurity)</td></tr>
<tr><td>Semester:</td><td>8th</td></tr>
<tr><td>Faculty Guide:</td><td>Ishani Sharma</td></tr>
<tr><td>Reference Text:</td><td>Gonzalez & Woods, <em>Digital Image Processing</em>, 3rd Ed.</td></tr>
</table>
<div class="cover-rule-sm"></div>
<div class="cover-session">Academic Session 2025–2026</div>
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<div class="ph-line">Shoolini University · CSU2543 · Digital Image Processing · Divya Mohan</div>
</div>
<main id="main-content">
<div class="container">
<h2>Practical 1: Loading & Displaying Images</h2>
<p class="no-print" style="margin-bottom:1rem"><a href="https://colab.research.google.com/github/divyamohan1993/dip-practical/blob/main/Practical_1.ipynb" target="_blank" rel="noopener"><img src="https://colab.research.google.com/assets/colab-badge.svg" alt="Open In Colab" style="height:20px;vertical-align:middle"></a> <span style="font-size:0.8rem;color:var(--text-muted)">Run this practical in Google Colab</span></p>
<div class="section-card">
<h3>Objective</h3>
<p>To learn how to load, display, and inspect digital images using client-side image processing in the browser.</p>
<div class="theory-box">
<strong>Theory:</strong> A digital image is a 2D matrix of pixel intensity values. For an 8-bit grayscale image, each pixel holds a value between 0 (black) and 255 (white). Understanding image representation is the foundation of all image processing.
<ul>
<li>Each pixel stores an integer intensity in the range [0, 255].</li>
<li>The image dimensions (width × height) define its spatial resolution.</li>
<li>Statistical measures (min, max, mean, std) summarize the intensity distribution.</li>
</ul>
</div>
</div>
<!-- Shared picker for Parts 1 & 2 -->
<div class="picker-bar" id="mainPicker"></div>
<div class="section-card">
<h3>Part 1: Load and Display a Single Image</h3>
<p>Load the selected image in grayscale and display it with its properties (shape, data type, min/max intensity, mean, and standard deviation).</p>
<button class="btn-run" id="btnDisplay" disabled>Display Image</button>
<div id="displayResult"></div>
</div>
<div class="section-card">
<h3>Part 2: Pixel Intensity Histogram</h3>
<p>Visualize the distribution of pixel intensities. The histogram shows how many pixels have each intensity value (0–255), revealing the contrast and brightness characteristics of the image.</p>
<button class="btn-run" id="btnHist" disabled>Show Histogram</button>
<div id="histResult"></div>
</div>
<div class="section-card">
<h3>Part 3: Display Multiple Images</h3>
<p>Display four sample images side by side in a 2×2 grid to compare different types of digital images.</p>
<button class="btn-run" id="btnMulti" disabled>Show Grid</button>
<div id="multiResult"></div>
</div>
<div class="analysis-box">
<h4>Analysis Questions</h4>
<ol>
<li>What does the shape of the image array represent? How do grayscale and color images differ in their array dimensions?</li>
<li>Why do we specify <code>cmap='gray'</code> when displaying grayscale images in Matplotlib? What happens if we omit it?</li>
<li>Compare the histogram distributions of two different images. What does a narrow histogram versus a wide histogram indicate about the contrast of an image?</li>
</ol>
</div>
</div>
</main>
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<p>CSU2543 Digital Image Processing · Shoolini University · Divya Mohan · Ishani Sharma</p>
</div>
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<div id="toast" class="toast" role="status" aria-live="polite" aria-atomic="true"></div>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-YvpcrYf0tY3lHB60NNkmXc5s9fDVZLESaAA55NDzOxhy9GkcIdslK1eN7N6jIeHz" crossorigin="anonymous"></script>
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<script src="./js/dip.js"></script>
<script src="https://cdn.jsdelivr.net/npm/chart.js@4/dist/chart.umd.min.js"></script>
<script src="./js/plot.js"></script>
<script src="./js/picker.js"></script>
<script>
(async function() {
var picker = await DIP.createPicker('mainPicker', {
defaultImage: 'cameraman',
onReady: function() {
document.querySelectorAll('.btn-run').forEach(function(b) { b.disabled = false; });
}
});
// Part 1: Display Image with properties table
document.getElementById('btnDisplay').addEventListener('click', async function() {
var sel = picker.getSelection();
if (!sel.filename) return DIP.showToast('Select an image first');
var container = document.getElementById('displayResult');
DIP.setLoading(container, true);
try {
var img = await DIP.loadImage(sel.url);
var st = DIP.stats(img.gray);
var panels = DIP.figure(container, sel.filename, 1, [{type: 'image', title: 'Loaded Image'}]);
DIP.draw.gray(panels[0].canvas, img.gray, img.width, img.height);
var table = document.createElement('table');
table.className = 'props-table';
var headerRow = table.insertRow();
var th1 = document.createElement('th'); th1.textContent = 'Property'; headerRow.appendChild(th1);
var th2 = document.createElement('th'); th2.textContent = 'Value'; headerRow.appendChild(th2);
var props = [
['Shape', img.height + ' \u00d7 ' + img.width],
['Data Type', 'uint8'],
['Min Intensity', st.min],
['Max Intensity', st.max],
['Mean Intensity', st.mean],
['Std Deviation', st.std]
];
for (var i = 0; i < props.length; i++) {
var row = table.insertRow();
var c1 = row.insertCell(); c1.textContent = props[i][0];
var c2 = row.insertCell(); c2.textContent = props[i][1];
}
container.appendChild(table);
} catch(e) {
container.textContent = 'Error: ' + e.message;
}
DIP.setLoading(container, false);
});
// Part 2: Histogram (image + chart side by side)
document.getElementById('btnHist').addEventListener('click', async function() {
var sel = picker.getSelection();
if (!sel.filename) return DIP.showToast('Select an image first');
var container = document.getElementById('histResult');
DIP.setLoading(container, true);
try {
var img = await DIP.loadImage(sel.url);
var panels = DIP.figure(container, sel.filename, 2, [
{type: 'image', title: 'Image'},
{type: 'chart', title: 'Histogram'}
]);
DIP.draw.gray(panels[0].canvas, img.gray, img.width, img.height);
DIP.chart.histogram(panels[1].canvas, img.gray, {
title: 'Pixel Intensity Histogram',
xlabel: 'Pixel Intensity',
ylabel: 'Frequency'
});
} catch(e) {
container.textContent = 'Error: ' + e.message;
}
DIP.setLoading(container, false);
});
// Part 3: Multi-image 2x2 grid
document.getElementById('btnMulti').addEventListener('click', async function() {
var container = document.getElementById('multiResult');
DIP.setLoading(container, true);
var names = ['cameraman', 'skull', 'dental_xray', 'galaxy'];
var sel = picker.getSelection();
var basePath = sel.url ? sel.url.replace(/[^/]+$/, '') : './data/';
var loaded = [];
for (var i = 0; i < names.length; i++) {
try {
var img = await DIP.loadImage(basePath + names[i] + '.png');
loaded.push({name: names[i], img: img});
} catch(e) {
// Skip images that fail to load
}
}
if (loaded.length === 0) {
container.textContent = 'No images could be loaded.';
DIP.setLoading(container, false);
return;
}
var panelDefs = [];
for (var i = 0; i < loaded.length; i++) {
panelDefs.push({type: 'image', title: loaded[i].name});
}
var panels = DIP.figure(container, 'Multiple Images', 2, panelDefs);
for (var i = 0; i < loaded.length; i++) {
DIP.draw.gray(panels[i].canvas, loaded[i].img.gray, loaded[i].img.width, loaded[i].img.height);
}
DIP.setLoading(container, false);
});
})();
</script>
</body>
</html>