Glossaire technique
Laser illumination
Laser diodes are based on the same principle as LEDs, but due to additional optical resonators they produce narrowband coherent light.
LED - SMD/COB
LED illumination are also available based on SMD (Surface Mounted Device), or COB (Chip on Booard) technology.
LED illumination - timing and strobing
The life span of LED illumination can be extended if they are only powered on when necessary
Lens Types
Fixed focus lenses, Zoom lenses, Lenses for multi-chip cameras, Standard resolution lenses, High resolution lenses, Large format lenses, Liquid lenses
Standard lenses that focus to infinity are very good when inspecting large components, but when objects are comparable in size to that of the imaging sensor, macro lenses are the best choice. Macro lenses are not specified in terms of their focal length, but are named according to the magnification. These lenses generally have a fixed working distance and a fixed iris and are optimised for magnification with distortion being kept to a minimum.
Logiciels : 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.
Logiciels : Image processing
Le traitement d'images numérique (en anglais digital image processing) est le terme général pour la vision et contient diverses branches comme la publication assistée par ordinateur, le traitement des documents, jeux vidéo et divers autres emplois.
Logiciels : Look-up tables (LUT)
Another widely used technique in image processing is 'Look-Up Tables'. LUTs allow image data to be passed through an array that maps an input pixel value to an output value.
Logiciels : OCR /ROC
Tools that perform Optical Character Recognition (OCR) have much in common with pattern matching and share many of the same underlying techniques such as pattern finding and contour detection.
Logiciels : OCV (Optical Character Verification)
OCV (Optical Character Verification) is used to check the quality of signs regarding brightness and legibility or the general existence of an imprint with respect to its position.
Logiciels : Pattern matching
Most vision tool kits offer some type of pattern matching tool to locate and classify objects and patterns. This is one area where there has been a great deal of development in recent years.
Logiciels : Pixel statistics
Pixel statistics are often used in very simple applications to detect part or feature presence/absence. This is achieved by examining the grey value statistics (histogram) of an image region.
- 1
- 2