There are three properties of a camera that represent a relevant selection criterion.

These are the sensor / chip of the camera, the camera type (characteristics of a camera) and the image transmission or the interface technology.



The sensor

Two main types of sensors are used in cameras for image processing: CCD and SMOS sensors.

CCD sensors fall into three categories: Interline Transfer, Frame Transfer and Full Frame.

CMOS sensors offer a multitude of more architectures with a wide variety of performance data.

The size of a sensor is usually given in inches.

Whereby "1" is not equal to "1" - the diagonal of the different sensor types is often measured. There are sensors with a 4:3 ratio, or also a (newer) 16:9 ratio. The ratio 3:2 is rare, but still occurs.

Example: 2/3" with a 4:3 ratio = 15.8 mm (diagonal) // 12.7 x 9.5 mm (WxH) 

A list of the sensors we use can be found here


camera Types

Two types are used in image processing: Area cameras and line scan cameras.

Line scan cameras are based on the line-by-line structure of an image. In inspection tasks, for example, either the line sensor moves linearly over an object, or the object is moved linearly under the sensor.

The area scan camera captures the object with an image (photography). Area scan cameras are available in different resolutions, frame rates and interfaces. There is a choice between a monochrome or a color sensor. Infrared and UV-sensitive sensors are also available.

Depending on the task of image processing, the factors pixel size, noise behaviour or trigger modes are of interest.

Camera Interfaces

When selecting the appropriate interface, the size of the bandwidth must be taken into account. Several standards have established themselves for connecting to the computer. There are:

GigE        (up to 100 m cable length and 100 MB/s data rate)

USB 3      (up to 5 m cable length and 350 MB/s data rate)

CameraLink / CameraLink HS USB 3.0 or USB 3.1 (both technically the same) is the latest interface in the image processing sector. The bandwidth between CameraLink and GigE as well as the plug-and-play functionality are a decisive advantage. USB 3.0 meets all industrial requirements. In addition, this interface is matched to the latest CMOS sensors and can fully exploit all the advantages of the new technology.  

Opto has developed a hybrid cable to operate the imaging modules with a connector. The hybrid cable is available as USB 3.0 or GigE version. The lighting and its control are integrated as well as the control cables for the "Intelligent" Imaging Module and the complete power supply. An appropriate shielding of the individual strings ensures that no interference occurs.

More information will follow shortly! 

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