Stemmer Offers Printqual Image Processing Tool

Stemmer Imaging has unveiled the Printqual Image Processing Tool for print quality inspection, as part of the Common Vision Blox hardware-independent imaging toolkit. Printqual allows a monochrome or colour test image to be compared quantitatively against a specified reference image for applications in every sector of print inspection.

It is an ActiveX control that can be used to inspect a wide range of print substrates such as paper, cardboard and labels, as well as overprints. Even highly complex work pieces, such as lead frames and printed circuit boards can be inspected for errors. Work with Printqual is divided into a learning or training phase, and the subsequent automatic inspection of the items. Acceptance thresholds can easily be determined by one or more acceptable test images.

The thresholds can be adjusted for the images to be accepted. The test image is position and distortion-corrected, and a comparison is made in terms of small, medium and large-scale structures within the image. All images producing a quality score below the determined acceptance thresholds will be rejected by Printqual. Unlike conventional correlation methods, Printqual makes it possible to distinguish between a large number of small errors and a single large error. The algorithm is so sensitive that errors of only a few pixels in size can be identified.

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