Glossaire technique
Vision Software
The basis of all imaging software is the ability to acquire, transfer, manipulate and interpret the pixel data output by a camera. What happens to these images can vary from the relatively simple task of saving them to disk, through to using them in a complex pattern recognition application.
2D calibration
Although not essential for all applications, calibrating a vision system is important if you are looking to extract data and make decisions based on measurements using real world units, such as for robot guidance.
3D tools
3D inspection is one of the latest buzzwords in the vision industry. The term 3D summarises a number of totally different acquisition and evaluation techniques that are used to gain object information that could not be easily analysed using 2D camera technology.
Barcodes and matrix codes
There are many types of barcodes used in industry to track and identify products. Traditional 1D barcodes use a number of lines with varying widths and spaces, which define a numeric string. 1D barcode reading software analyses these patterns and returns a string.
Blob Analysis
The purpose of a blob tool (sometimes called a connectivity tool) is to measure the parameters of discrete objects within an image.
Carte de profondeur
Une carte de profondeur – appelée aussi image 2,5D ou « z map » – est une image de coordonnées en z basée sur les pixels. Elle est en général créée à l’aide d’une caméra 3D. Les niveaux de gris dans la carte de profondeur représentent les valeurs de hauteur.
Colour space conversion
Cameras used in machine vision usually deliver colour image data in one of two formats YUV or RGB.
Detection of general movement
The determination of localised movement in video is of major importance in applications such as traffic flow and people movement in security and surveillance, however the technique also finds use in science and industry with applications such as bulk movement estimation on conveyors and process monitoring.
Filtering
Image filtering is a technique that is used to correct or enhance an image, for example to remove noise, sharpen contrast, or to highlight contours within an image.
FPGA (Field Programmable Gate Array)
A FPGA is a reconfigurable silicon chip that pre-processes image data in the camera or on the frame grabber and in this way relieves the load on the host.