Comments on: Study: RFID Scan Accuracy Drops As Number Of Items Increases http://storefrontbacktalk.com/securityfraud/study-rfid-scan-accuracy-drops-as-number-of-items-increases/ Techniques, Tools and Tirades about Retail Technology and E-Commerce Sun, 20 May 2012 01:49:40 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: Roberto http://storefrontbacktalk.com/securityfraud/study-rfid-scan-accuracy-drops-as-number-of-items-increases/comment-page-1/#comment-39385 Roberto Fri, 15 Aug 2008 14:36:04 +0000 http://www.storefrontbacktalk.com/securityfraud/study-rfid-scan-accuracy-drops-as-number-of-items-increases/#comment-39385 In my experience with Item Level RFID tests, I have found that today's RFID HandHelds do are not ready for doing cycle counts of item level tagged product. Also, RFID HandHelds are much more sensitive to the quality of the RFID tag. In my experience with Item Level RFID tests, I have found that today’s RFID HandHelds do are not ready for doing cycle counts of item level tagged product. Also, RFID HandHelds are much more sensitive to the quality of the RFID tag.

]]> By: Chris Kapsambelis http://storefrontbacktalk.com/securityfraud/study-rfid-scan-accuracy-drops-as-number-of-items-increases/comment-page-1/#comment-39239 Chris Kapsambelis Thu, 14 Aug 2008 15:08:23 +0000 http://www.storefrontbacktalk.com/securityfraud/study-rfid-scan-accuracy-drops-as-number-of-items-increases/#comment-39239 One element of this application is the reading of tags on clothing hanging on a Z-bar. Using a mobile RFID reader, the user is asked to aim the reader at the clothes in various orientations passing it back and forth and around until all the readings were recorded. What bothered me about this procedure is the question as to when, and how the user determines that all the tags are read. On the last page of this study I found the following sentence: "In the course of evaluating read rates to determine how a test should proceed, each tester often had to know how many tags they were attempting to read during a test. In practice, however, this might often not be the case." I believe the last sentence of this quotation to be incorrect. It is safe to say that in practice this is never the case. I believe the read rates would be much lower in any practical environment where the user does not know the number of tags involved, and has to use judgment to determine when to stop. Furthermore, the results would be highly variable from user to user depending on training and commitment to the task. The study can be downloaded from here: http://itri.uark.edu/91.asp?code=&article=ITRI-WP112-0608 One element of this application is the reading of tags on clothing hanging on a Z-bar. Using a mobile RFID reader, the user is asked to aim the reader at the clothes in various orientations passing it back and forth and around until all the readings were recorded.

What bothered me about this procedure is the question as to when, and how the user determines that all the tags are read.

On the last page of this study I found the following sentence:

“In the course of evaluating read rates to determine how a test should proceed, each tester often had to know how many tags they were attempting to read during a test. In practice, however, this might often not be the case.”

I believe the last sentence of this quotation to be incorrect. It is safe to say that in practice this is never the case.

I believe the read rates would be much lower in any practical environment where the user does not know the number of tags involved, and has to use judgment to determine when to stop. Furthermore, the results would be highly variable from user to user depending on training and commitment to the task.

The study can be downloaded from here:

http://itri.uark.edu/91.asp?code=&article=ITRI-WP112-0608

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