Camera systems are used in order to guarantee industrial quality requirements of products and product marking. Furthermore they can be used for measuring reasons in the quality control. Cameras in industrial use are very robust and have a high picture quality.
At the beginnings of camera systems, mostly verification systems with a serial interface have been implemented. Today systems are in use where the data transfer from camera to the processing computer is done by digital interfaces like USB, FireWire and Ethernet. Camera systems differ into two types: Matrix cameras and linescan cameras.
Matrix cameras save the read picture information in form of pixels in lines and columns. They always save the complete picture information which on the other hand leads to a reduction of the frame rate. To enhance the reading speed there is the possibility to summarize several pixel, however this reduces the picture resolution.
Besides the matrix cameras in the industry linescan cameras are commonly used. This type of camera only has one light sensitive line (linesensor), whereas a two dimensional sensor has several linesensors to save the pixels on the processor.
The advantage of a linescan camera is the high speed processing of data as well as the larger data storage. Compared to a matrix camera, one line only needs minimum chip storage space. Furthermore a bigger area can be scanned and lines can be faster read than space.
In the industry, camera systems are used for quality actions and sorting methods. In the process the verification systems are mounted above the product to be read, only the product moves. By the aid of a sensor the camera gets the starting signal to flash. Depending on the light of the surrounding and on the contrast between product and readable information, one should work with filters and diverse lamps.