What are the characteristics of a line scan camera? Why is it used in machine vision inspection?

Line scan cameras are mainly used for image processing in the fields of industry, medicine, research and security. Typical areas of application are the inspection of continuous materials such as metals, plastics, paper, and fibers. The object to be inspected is usually moving at a constant speed, and one or more cameras are continuously scanned line by line to achieve a uniform inspection of its entire surface. The image can be processed line by line, or by area array image consisting of multiple lines. In addition, the line scan camera is ideal for measurement applications, thanks to the high resolution of the sensor, which can accurately measure down to the micron. It has the following features:

1. Line scan sensors used in line scan cameras usually have only one line of sensors (a few color line scans use three lines of sensors)

2. The line scan camera only collects one line of images at a time;

3. The line scan camera only outputs one line of images at a time;

4. Compared to traditional area scan cameras, area scan captures several lines of images at a time and outputs them in frames.

Why Use Line Scan Cameras in Machine Vision Inspection?

1. Line scan cameras have higher resolution; Line scan cameras generally have 1024, 2048, 4096, 8012 pixels per line, while general area scan cameras are only 640, 768, 1280, and area scans larger than 2048 are rare.

2. The acquisition speed of the line scan camera is faster; The acquisition speed of different models of line scan cameras ranges from 5,000 to 60,000 lines per second, and users can choose to form a frame of image for processing once in a few lines or every dozen lines, so that a high frame rate can be achieved.

3. The line scan camera can be continuously acquired and processed without interruption; Line scan cameras can continuously capture objects moving in a straight line (linear guides, paper, fabrics, prints, objects on conveyor belts, etc.).

4. The line scan camera has a simpler and more reasonable structure. In contrast to area scan cameras, line scan cameras do not waste resolution to acquire useless data.

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