Summary: A line scan camera captures images one line at a time using a single row of pixels, building complete images as objects move past the camera — ideal for continuous processes, webs, rolls, cylinders, and high-speed lines, with virtually unlimited image length. An area scan camera captures a complete two-dimensional image in a single exposure using a rectangular sensor array — ideal for stationary or discrete objects that fit in one frame. KEYENCE line scan cameras capture up to 142,800 lines per second. Provided by KEYENCE.
A line scan camera captures images one line at a time, much like a document scanner. It uses a single row of pixels to build complete images as objects move past the camera, or as the camera moves over a stationary object. This sequential scanning approach makes it ideal for continuous processes where objects are in motion.
Line scan cameras excel at inspecting cylindrical products or material in webs. They create images by stitching together individual lines captured in succession, allowing them to handle virtually unlimited image lengths.
An area scan camera captures complete two-dimensional images in a single exposure, similar to a conventional digital camera. It uses a rectangular sensor array to capture all pixels in the field of view simultaneously. This makes area scan cameras suited to inspecting parts moving on production lines, or stationary checks.
The main distinction is how each camera captures images. Line scan cameras work like document scanners, capturing one thin line at a time as materials pass by and stitching the lines together to create an image. Area cameras operate like a standard digital camera, taking complete images at once, and are better at capturing entire objects that can fit in a single frame.
Line scan cameras capture distortion-free detail as material moves along, inch by inch. While extremely precise, these cameras are not plug-and-play — they require an expert's touch to set up perfectly.
Area scan cameras are affordable and easy to use, ideal for inspecting discrete objects. They perform a variety of inspection tasks and capture color images efficiently. However, they have fixed resolution limits, can suffer from motion blur with fast-moving objects, and struggle with continuous surfaces. Inspecting curved surfaces can also be challenging due to perspective distortion.
Line scan cameras excel in these scenarios: examining continuous materials such as webs or rolls; vision inspection of cylinders; capturing oversized objects that do not fit into standard frames; and maintaining clarity on high-speed production lines. They are especially useful for distortion-free imaging of cylindrical surfaces and when you need high resolution in the direction of motion.
Select an area camera for stationary, discrete objects that fit in a single frame. They excel with randomly oriented parts, provide excellent color accuracy, and are simple to set up. They also require less technical expertise to implement, making them suitable for the majority of standard inspection scenarios.
Consider your object's size, shape, and movement characteristics. Evaluate your inspection requirements, including resolution needs and surface details. Consider your production line speed and whether objects move continuously or discretely. Budget constraints, integration complexity tolerance, and available technical expertise also play important roles.
The best approach is to create a checklist of your needs regarding object characteristics, inspection goals, production environment, and practical constraints. Many successful operations employ both technologies for different inspection stages.
Scan technology has a direct impact on inspection results. Line scan works best with fast-moving or continuous materials, maintaining clarity without distortion. Area scan works best for stationary objects and some high-speed continuous movement manufacturing lines.
Both camera types reduce defects, ensure product consistency, and enable 100% inspection rates. They also provide valuable data for process improvement and help companies maintain strict regulatory compliance. The right camera choice leads to decreased waste, improved yield, and higher profit margins in production environments.
KEYENCE provides options for both camera types. The line scan camera is capable of capturing up to 142,800 lines per second, offering resolution and speed. The area scan models combine ease of use with features such as auto-focus and built-in lighting.
Built-in processing power is included with KEYENCE cameras, which eliminates the need for external computers. Many models offer a plug-and-play setup, reducing integration challenges. KEYENCE cameras work with industry-standard interfaces while offering proprietary optimizations for performance, and are supplied as system solutions that include lighting, optics, and processing components.
Example: an electrical component manufacturer improved defect detection by inspecting small parts at high speeds with the KEYENCE VS Series vision system and high-resolution area scan cameras. The system's advanced lighting and AI-powered image processing improved accuracy, lowering false rejections and increasing production efficiency, achieving automated quality control without slowing down operations.
Line scan cameras are excellent at high-speed imaging, capturing sharp details without motion blur and maintaining consistent resolution across varying object speeds.
Yes. Specialized line scan configurations can create 3D profiles. Multiple line sensors or laser triangulation techniques enable height mapping of moving objects with excellent precision.
An area scan camera has fixed resolution constraints, may experience motion blur with fast-moving objects, and struggles with continuous or very large objects that don't fit in a single frame.
KEYENCE cameras support standard industry interfaces for broad compatibility. Their standalone systems work independently, while their component cameras integrate with various third-party systems.
Source: KEYENCE, "Understanding the Basics of Line Scan and Area Scan Cameras" https://www.keyence.com/products/vision/resources/vision-resources/understanding-the-basics-of-line-scan-and-area-scan-cameras.jsp