A line scan camera is a specialized imaging device designed to capture high-resolution images one line at a time. Unlike traditional area scan cameras that capture an entire frame in a single exposure, line scan cameras are ideal for continuous motion applications, such as conveyor belt inspections, printing quality control, and web monitoring. Their ability to produce extremely detailed images makes them indispensable in industries requiring precision and speed.

This article explores the working principles, advantages, applications, and selection criteria for line scan cameras, providing a comprehensive understanding of their role in modern industrial imaging.

How a Line Scan Camera Works

A line scan camera captures images by recording a single line of pixels at a time. As the object being inspected moves relative to the camera (or vice versa), the camera continuously scans line after line, compiling a complete 2D image.

Key Components of a Line Scan Camera

1. Linear Sensor Array – Unlike area sensors, a line scan camera uses a single row of photosensitive pixels, enabling ultra-high resolution in one dimension.
2. Precision Timing Control – Synchronization with object movement is critical to avoid distortion.
3. High-Speed Data Interface – Cameras often use interfaces like Camera Link, CoaXPress, or GigE Vision to transfer large amounts of data quickly.
4. Optics & Lighting – Specialized lenses and illumination ensure consistent image quality across fast-moving objects.

Advantages Over Area Scan Cameras

• Higher Resolution – Can achieve resolutions exceeding 16K pixels in width.
• Continuous Imaging – Ideal for inspecting endless materials like textiles, metals, or printed sheets.
• Reduced Data Load – Processes only one line at a time, optimizing bandwidth.

Industrial Applications of Line Scan Cameras

Due to their unique imaging capabilities, line scan cameras are widely used in industries where high-speed, high-resolution inspection is required.

1. Printing & Packaging Inspection

• Detects defects in labels, barcodes, and printed materials.