Thursday, September 10, 2009

EMVA1288 Standard

The European Machine Vision Association Standard 1288 is designed for unification of description digital photocameras and photosensors' characteristics. This is an open standard that provides a framework for estimation of camera's characteristics. The EMVA1288 standard is build modularly and contains all necessary recommendations and comprehensive mathematical formulation of how to measure and estimate photosensor's characteristics.

Every module of EMVA1288 Standard consists of mathematical model, the experimental setup, calculation steps and recommendations of how to publish the results of measuring. Currently (version 2.01A) there are two modules for the EMVA1288 standard: Module 1 "Characterizing the Image Quality and Sensitivity" and Module 2 "Linearity and Linearity Error".

In the Module 1 "Characterizing the Image Quality and Sensitivity of Machine Vision Cameras and Sensors", the procedure of how to characterize the temporal and spatial noise of a camera and it's sensitivity to light is described.

In the Module 2 "Linearity and Linearity Error" is described the method of estimation of area and linescan sensors/cameras for which the output signal is expected to be directly proportional to the impinging photon flux (exposure). Although this module is optional, it may be useful for estimation of the real dynamic range of the photo sensor.

The EMVA1288 Standard was re-typesetted in LaTeX format as the more appropriate format for scientific use. The latest LaTeX version of the EMVA1288 Standard can be downloaded from these mirrors:
As for concluding remark, I can additionally say that EMVA1288 Standard is useful not only for machine-vision cameras but for consumer-grade cameras, too. RAW data from the consumer-grade cameras, after appropriate conversion by such software as dcraw, can be used for characterisation of consumer-grade camera as a measuring device.

No comments:

Post a Comment

Related Posts Plugin for WordPress, Blogger...