Understanding color machine vision

April 17, 2006
From simple sorting to complex analysis of print, color vision systems can provide production verification if the proper controls are built into the system.

From simple sorting to complex analysis of print, color vision systems can provide production verification if the proper controls are built into the system.

Many color-verification systems match the color contained within images to a predefined color. Determining the extent of color control needed in the system depends upon the application and how the tools are applied. If a part simply needs to be verified as red and the system need not analyze the exact color composition, strict controls may not be needed. However, if a machine-vision system needs to ascertain that the red exactly matches a defined pantone color, the system may benefit from white-balancing and color calibration. Special attention should also be given to control even minor color shifts that are the result of aging lights, temperature, and ambient lighting conditions.

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