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For years pattern matching has been a machine vision staple in applications that detect, count, align, or inspect objects. National Instruments pattern matching is based on highly optimized cross-correlation algorithms that use stable pixel regions and edge information within an image to accurately locate matching templates down to one-tenth of a pixel and one-tenth of a degree. However, you may have difficulty using cross-correlation-based pattern matching to match templates that are overlapping or scaled to different sizes.

With the new Vision 7.1 Development Module, you can use a new matching tool called geometric matching to solve these more complicated vision application challenges. Geometric matching is a powerful algorithm for finding and sorting overlapping objects that are only partially visible, for matching components that contain distinct geometric information, and for guiding robots when objects in the field of view change scale as a camera moves closer to and further from them.

Pattern matching and geometric matching are both two-step processes. The first step is to learn a template and the second step is to search for a match to the template within an image. In correlation-based pattern matching, the learning step extracts large areas with similar pixel values and sharp edges to create a simplified model that speeds up the search. Geometric matching also builds a model of the template in the learning step, but rather than look for stable pixel regions and edges, it looks for 2D shapes such as circles and rectangles, linear primitives such as parallel lines, and other distinct geometric features such as corners and curves. The second step in both algorithms uses the abstracted templates from the learning step to search for a match in the image.

These two algorithms cover a wide range of matching applications and scenarios. Correlation-based pattern matching is effective in general matching applications for which features are defined by their grayscale values or textures. Examples are prevalent when inspecting consumer packaging and labels for cosmetic defects. You cannot easily define these labels, which often contain complex patterns or many shades of gray, by geometric shapes. Geometric matching works best when you are defining objects by geometric components such as stamped metal parts moving down an assembly line. With geometric matching, you can identify, locate, and sort these metal parts even if they are overlapping, dirty, or reflecting glare. Learn more about NI vision algorithms and request an evaluation copy of the NI Vision 7.1 Development Module.

01.03.2005
NI Vision Debuts New Geometry-Based Matching Tool

Nl Honors 15 Alliance Program Members

NEWS RELEASE – March 1, 2005 – National Instruments today recognized 15 out of the more than 500 companies in the National Instruments Alliance Partner program as Select Alliance Partners for 2005. Alliance Partners use their application expertise and in-depth knowledge of National Instruments products to build customer-defined solutions in a wide range of industries and applications including aerospace/defense, automotive and manufacturing test. NI reserves the Select Alliance Partner category for distinguished members of the Alliance Partner program who have established a high level of business, commitment to an ongoing relationship with NI and professional business practices.

2005 Americas Select Alliance Partners:

· Advanced Measurements, Inc. (Canada)
· B&B Technologies, Inc.
· Bloomy Controls, Inc.
· Cal-Bay Systems, Inc.
· DAQTron, Inc.
· VI Engineering, Inc.
· Viewpoint Systems

2005 Europe/Asia Select Alliance Partners:
· Alfautomazione (Italy)
· AmFax (United Kingdom)
· Goepel (Germany)
· Konrad Technology (Germany)
· MeasX (Germany)
· MicroLEX (Denmark)
· Peritec (Japan)
· Qualimatest (Switzerland)

“National Instruments is pleased with the continued growth of our existing Select Alliance Partners as well as our new additions, particularly internationally,” said Pete Zogas, NI senior vice president of sales and marketing. “With the Select Alliance Partner distinction, our goal is to identify best-of-class partners around the world and in various industries that we can recommend to our customers to develop their most challenging applications.”

All Select Alliance Partners work closely with National Instruments worldwide sales, marketing, R&D and technical support organizations to choose and integrate the best products to ensure customer satisfaction. Select Alliance Partners also demonstrate ethical business practices, a commitment to customer success and financial stability.

For more information about the Alliance Partner program and Select Alliance Partners, readers can visit www.ni.com/alliance .

01.03.2005
National Instruments Names Select Alliance Partners for 2005

NEWS RELEASE - Feb. 8, 2005– National Instruments today announced several new image acquisition boards for machine vision and scientific imaging, including the new NI PCI-1426 low-cost image acquisition board for base-configuration Camera Link cameras. The PCI-1426 is the newest NI image acquisition board in a suite of digital and high-performance Camera Link image acquisition devices.

The PCI-1426 board features onboard image binarization, 16 MB of onboard memory and an optically isolated 15-pin D-Sub connector for camera triggering and system synchronization. Delivering an affordable solution for base-configuration Camera Link cameras, the new PCI-1426 completes the suite of NI Camera Link image acquisition boards. The suite includes the NI PCI-1428 image acquisition board for medium-configuration Camera Link cameras and the NI PCIe-1429, the industry’s first PCI Express frame grabber, for full-configuration Camera Link cameras. The PCI-1426, PCI-1428 and NI PCIe-1429 boards are ideal for both high-speed, industrial inspection applications and high-resolution scientific imaging applications.

Additionally, NI released two new analog image acquisition boards, the high-performance NI PCI-1410 and the low-cost NI PCI-1405. The monochrome, four-channel PCI-1410 offers support for nonstandard analog cameras and eliminates the need for extra synchronization signals to acquire nonstandard images. The PCI-1405 is a low-cost, color image acquisition board that is ideal for applications such as security monitoring.

08.02.2005
National Instruments Expands Suite of Camera Link Image Acquisition Boards

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