EMVA1288 Standard
Image quality plays a decisive role when selecting an appropriate camera for a particular application or for the comparison of two camera models. However, the manufacturers’ data sheets can often be difficult to understand and compare, or potentially required information may be missing.
Quelle est la meilleure façon de comparer les caméras CMOS modernes ?
Dans notre livre blanc, nous comparons les capteurs CMOS modernes. Ce faisant, nous examinons les performances des caméras industrielles avec le même capteur CMOS :
Quelles sont les différences pour le fabricant de la caméra lors de l’intégration de nouveaux capteurs CMOS ?
Qu’est-ce qui distingue une bonne intégration de capteur CMOS ?
Quel rôle jouent les données EMVA dans la qualité de l’image ?
Comment vérifier les fonctions du micrologiciel et la stabilité de la transmission des données ?
Comment les différences de prix se produisent-elles malgré le même capteur ?
This is where the EMVA1288 standard from the European Machine Vision Association (EMVA) comes in. It uniformly specifies various parameters for image quality along with the corresponding measuring and representation methods. Since this standard was established, Basler AG has been a member of the associated committee and actively contributes to its further development.
The standard offers you various benefits. You no longer have to perform elaborate measurements on your own, for example, to assess the image quality of a camera or image sensor. Additionally, it is easy to compare various cameras even across different manufacturers.
EMVA1288 Standard – Release 3.1
To keep up with the dynamic development of digital image sensors, the standard is revised regularly. Release 3.1 is the result of the standard committee’s continuous optimization process and reflects the current state of technology. To make sure that you as a customer can benefit from all the advantages of this release, Basler will conduct all future EMVA measurements and test reports with it.
We would like to briefly introduce the most important contents:
1) Standardized EMVA Reports:
Compared to previous releases, this one no longer just defines the measuring methods but also specifies how the results are represented. Release 3.1 contains a template data sheet with a standardized summary page. On this summary page, you can find the most relevant data at a glance, namely:
[1] Le point de fonctionnement utilisé pour les mesures.
[2a] le diagramme de transfert de photons pour vérifier que la caméra fonctionne de manière linéaire et que les mesures EMVA1288 peuvent lui être appliquées.
[2b] le diagramme signal/bruit (SNR) dans lequel il est possible de visualiser le seuil de sensibilité absolue, la capacité de saturation, le ratio maximal signal/bruitet la plage dynamique.
[3] Une liste des paramètres de EMVA1288 familiers.
En tant qu’aspect central de la version 3.1, le rapport est désormais conçu pour représenter les résultats de mesure d’une seule caméra afin de permettre une représentation claire et bien organisée des données.
Basler continuera à capturer EMVA1288 données pendant la production afin de maintenir ses normes de qualité élevées. Pour les rapports d’essai, des mesures détaillées seront effectuées dans un laboratoire d’essai séparé.
2) Development of the quantum efficiency in dependency on the wavelength:
The quantum efficiency (QE) of a particular wavelength is often one of the most important criteria for the selection of a camera. Depending on whether you use your application with green light, red light or even in the infrared range, this will result in different QE values for the image sensors.
In the EMVA1288 standard only the measurement with a predefined wavelength is obligatory. Due to the technically demanding test set-up, a measurement of the QE development is optional.
However, Basler is convinced that these measurements offer you added value and will make the corresponding QE values available to you. This way we can ensure high reliability during your selection of the appropriate camera models.
3) New test setup:
A new test setup was created at Basler for measurements according to Release 3.1. It was calibrated with the help of a certified reference photodiode. As in any calibration, the usual tolerances from 3 to 5% apply. There is also a shift of the measuring point for the primary measurement from 545 nm to 541 nm. Therefore a direct comparison between the measurement results from Release 3.1 and those of the previous reports is not possible.
EMVA Reports
The EMVA reports give you a detailed list of the EMVA data for the desired camera.
Download the EMVA reports here now