February, 2013
www.us-tech.com Image-Based Barcode Readers Continued from previous page
the same position in the image every time. On the other hand, the on-chip vision system’s high frame rate and its ability to discard images without codes as well as pinpoint the codes in the remaining images eliminate this need for a trigger. Some conventional high-speed
imaging applications use an advanced triggering technique called “burst mode” to overcome positional uncer- tainty. For example, some image- based readers can capture up to 22 images at a frame rate of up to 60 frames per second. Of the 22 images,
You Only Think You Don’t Need X-Ray Imaging
Continued from page 62
removing the over molded materiel to reveal the suspect area. X-ray inspec- tion saved tens of thousands of dollars in overtime costs per year. Miscellaneous applications in -
clude biological research, geological research and agricultural research. Typical users for this application area would be research facilities that require detailed images without damaging the sample. Items that would be x-rayed are soil samples, bugs, fish, seeds for growth viability, grain for bug infestation and root
perhaps only two or three that contain the barcode are buffered in the reader. Decode timeouts, set appropriately to decode those two or three images, would apply to all 22 images. Parts moving toward the reader would have to be spaced so that the reader finish- es processing the buffered images before acquiring the next set of 22. Although this approach ad -
dresses positional uncertainty, the necessary part separation introduces an additional process complication. By contrast, the on-chip vision
system’s much higher frame rate allows capturing images without buffering them or requiring part sep- aration. Also, the higher frame rate captures many more images contain-
ing the barcode, permitting more opportunities to read each code. In other words, less sensitivity
to position uncertainty offers a more robust read result. Even with a damaged code or in less-than-ideal lighting conditions, at least one of the captured images will likely per- mit a relatively easy analysis. In addition, processing timeouts for images with codes can be set toward the average rather than the maxi- mum, again improving total system throughput. For straightforward applica-
tions that require only reading well- printed 1-D barcodes at high speeds at fixed positions, laser scanners will likely continue to provide a reliable,
cost-effective solution. But when the more advanced
capabilities of image-based scanning are needed, along with high through- put, on-chip vision systems offer the best — if not the only — viable solu- tion. This next generation technology reduces downtime and changeover time, and will result in fewer parts rejected, less manual rework, and cost savings. Contact: Cognex, One Vision
Drive, Natick, MA 01760-2059: % 877-264-6391 fax: 508-650-3344 E-mail:
pr@cognex.com Web:
www.cognex.com r
See at Electronics West/MD&M Booth #4453.
Page 65
X-Scope 1800 x-ray system from Scienscope.
systems of saplings. X-Ray systems designed prima-
rily for inspecting electronics do have limitations in the overall x-ray tube power and the lack of field of view due to the high magnifications required to inspect surface mount components, but those limitations are easy to overcome making a real- time micro focus x-ray system into a powerful inspection tool — one that can be used in all areas of the manu- facturing environment from incom- ing inspection all the way through to after-sale customer support. Contact: Scienscope, 5751
Schaefer Ave., Chino, CA 91710 % 800-216-1800 or 909-590-7273 E-mail:
info@scienscope.com Web:
www.scienscope.com r
See at IPC/APEX Booth #2847 and Electronics West/MD&M Booth #2878.
See us at IPC/APEX Booth 3201 12:37 PM
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