The principle of line scan camera, the characteristics of line scan industrial camera?

Line scan industrial cameras, as the name suggests, are in the shape of a "line" imaging sensor. Although it is also a two-dimensional image, it is extremely wide, a width of several thousand pixels, and the height is only a few pixels. This camera is generally used in two situations:

1.The field of view to be measured is a slender ribbon, which is mostly used for detection problems on the drum.

2.Requires a great field of view or extreme precision.

Features of line scan cameras:

1.Line scan cameras typically use line scan sensors with only one line of sensors (a few color line scans use two or three lines of sensors).

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

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

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

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A line-scan camera works by shining a ray of light onto the surface of an object, then collecting information from the reflected light and converting it into an electrical signal. Specifically, a line-scan camera generally shoots only one line at a time (the line width is usually 1 pixel), and in the process of mechanism movement, the line-scan camera continuously shoots the line, so that the lines are "gathered into a surface". The line scan camera has the advantages of high speed, high precision, low cost, programmability and reliability, it can be used for surface detection, object positioning, size measurement, shape measurement, etc., Huahan Weiye line scan technology is applied to the appearance inspection of cylindrical batteries, the appearance defect detection before and after the square shell battery wrapping, etc., to solve the difficult problems of low contrast and inobvious defect effect of traditional 2D imaging, greatly improve the detection accuracy, and make the defect classification more accurate and refined.

1.Selection of light source and lens F-mount lens Linear LED light source or halogen.

Light source 2Uniformity of movement of the kinematic mechanism Rotary encoders are required for precise measurements.

3.Image acquisition during debugging Matching of motion speed and camera acquisition speed Normal Too fast Too slow 4Application case confidential no distribution permitted In the past, line scan systems were widely used in the paper, printing, steel and glass manufacturing industries Nowadays, line scan systems are also used for high precision.

Dimensional measurement and defect detection item 4Case 1: confidential no distribution permitted Mechanical movement through the drum.

Convert round objects into flat images for character recognition, color detection, and defect detection 1The lettering content is error-free 2Whether the arrangement of various colored stripes is accurate 3

Various color stripes color shade 4Case 2: Defect Detection Confidential No Distribution Permitted Defect detection through the pre-processing and algorithm of Sherlock software Cracks are difficult to separate from the background Corrosion White Smoothing Roughness Threshold Analysis Dimensional Filtering 4

Case 3: Scratch Detection confidential no distribution permitted Detect defects through the pre-processing and algorithms of the Sherlock software Surface texture of glass Use a better light source But the defect is still not clear Smoothing and calculating roughness.

corrosion and threshold analysis 4Application case 4: Precision measurement confidential no distribution permitted Precise dimensional measurement and defect detection of flat objects through mechanical motion confidential n

The principle of the line scan camera is to combine the optical system and the CCD, use the optical system to project the image on the object to the CCD, and then use the CCD line scan to receive the image data by line to obtain the position information on the object. The line scan camera can quickly acquire image data, and can also realize three-axis positioning.

While monochrome images are sufficient for many of today's inspection applications, such as looking for defects, scratches, or cracks, the use of color images is quietly increasing for those where "monochrome images do not provide enough differentiation to identify objects of interest." In the past, color imaging was not widely used in machine vision inspection because the technology cost of color imaging was too high and the camera speed was too slow. But after more than two decades of development, the technology behind color line scan cameras has reached a point where it can be used more widely.

Due to the short time, in many cases, high-speed inspections place very high demands on illumination. These applications require extremely responsive cameras, which may not be able to be performed by single-line color trilinear cameras.

To meet the needs of this application, the machine vision industry has developed CMOS cameras with TDI (Time Delay Integration) technology, which also require high-speed data transmission to keep up with high-speed data processing. The Piranha XL camera includes the recently developed high-speed data transfer protocol CameraLink HS to increase the data transfer speed. Some applications may require color imaging, but not necessarily true color imaging.

For example, in applications in industries such as pharmaceutical, security, electronics, and food, the main consideration for using different colors for imaging is to distinguish between different features of an object. In these cases, a low-cost dual-line color camera is a cost-effective solution. Quad-line cameras can pair color vision with other technologies to feature objects that are not visible to the human eye or monochrome cameras.

For applications where objects contain components of the invisible spectrum, such as solar panels, banknotes, and glass detection, these cameras will be powerful.

Color line scan cameras can also be used as multi-channel monochrome line scan cameras. It's a clever way to use a color camera. For example, let's say you have three defect items that need to identify scratches, dust, and mura that are visible under red, green, and blue light, respectively.

Therefore, red, green, and blue light need to be irradiated on the object at the same time, and the images of the red, green, and blue channels need to be processed separately. Some color line scan cameras can independently control the time of each channel, and users are able to use them to capture monochrome images with high dynamic range. This is a case of a color camera as a monochrome camera that requires a high level of color purity.

The color filters of current trilinear cameras are dye- or pigment-based, and there is spectral crosstalk between color channels. Red, green, and blue light are more or less mixed together. To address this challenge, a new dichroic filter with minimal crosstalk is being developed.

Once the technology is put into use, it will be very beneficial for color cameras to be used as monochrome applications.

The line scan industrial camera is a kind of industrial camera, and its main features include the following aspects:

1.High-speed acquisition capability: The line scan industrial camera can achieve high-speed continuous acquisition through a single-line CCD or CMOS sensor for image acquisition, which is suitable for the capture and detection of high-speed moving objects.

2.High resolution: The sensors of line-scan industrial cameras capture only one slice of an object at a time, which is then stitched together through multiple scans to form a complete image. As a result, line-scan industrial cameras are characterized by high resolution and can capture even the smallest details.

3.Adaptable to wide-format scenes: Wire-scan industrial cameras can be used to shoot wide-format scenes, such as long strip-like silver objects on the production line, continuous flow of materials, etc. Through continuous scanning stitching, the line scan industrial camera can capture an image of the entire scene.

4.Adapt to high-speed motion: Since the line scan industrial camera collects images line by line, for high-speed moving objects, the line scan industrial camera can avoid motion blur and ensure the clarity and accuracy of the image.

5.Adapt to special environments: Wire scan industrial cameras can adapt to work in special environments, such as high temperature, low temperature, humidity, dust, etc. Some line scan industrial cameras also have the characteristics of waterproof, dustproof, and shockproof, which can work stably for a long time in harsh industrial environments.

6.Cost-effective: Compared with area scan industrial cameras, line scan industrial cameras have lower manufacturing costs and higher image quality, so they have higher cost performance in some applicable ranges.

It should be noted that the line scan industrial camera is suitable for application scenarios with high requirements for time and space, while for the shooting of static scenes, the area scan industrial camera may be more suitable.

The features of the line scan industrial camera are:1.The line scan sensors used in line scan cameras usually only have a single line of lead sensors (a few color line scans use two or three lines of sensors).

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

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

4.In contrast to conventional area scan cameras, area scan captures several lines of images at a time and outputs them in framed brightness.

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information.

The advantages and disadvantages of wide-format close-line scan cameras and traditional line scan cameras are compared with Zen Zhaogao.

The advantages of using a line-scan lens on a DSLR are as follows:

1. High resolution: The line scan lens usually has a high resolution, which can capture more details and image information of the cong car. This makes it useful in applications that require high-quality images, such as commercial photography, product photography, and more.

2. High-speed shooting: Line scan lenses usually have a fast scanning speed and can obtain a large amount of image data in a relatively short time. This makes it useful in scenes that require high-speed continuous shooting or quick capture of movement, such as sports photography, wildlife photography, etc.