The Nielsen Comapny (us), LLC

Saflink Corporation

Imprivata, Inc.

The Neilsen Company (us), LLC

Nielsen Media Research, Inc.

Dan Nelson

Arun Ramaswamy

Christen Voss Nielsen

David Howell Wright

Raghuram Ranganathan

James Petro

Deborah Cross

Glen Vilches

Venugopal Srinivasan

Kevin Keqiang Deng

Paul Mears

John C Peiffer

Timothy J Brown

Rodney Rivers

Derrick McCulley

Gregory C Jensen

Morris Lee

Weston Headley

Weston P Headley

Paul M Mears

Methods, apparatus, systems and articles of manufacture are disclosed to optimize reference signature matching using watermark matching. An example disclosed herein includes selecting first unhashed reference signatures to evaluate for a second time segment of monitoring data based on watermark coverage of a first time segment of the monitoring data, the monitoring data obtained from a meter monitoring media presented by a media device and comparing the first unhashed reference signatures with first unhashed monitored signatures from the second time segment of the monitoring data. The example further includes, when a first media event associated with the monitoring data is not identifiable based on the comparing of the first of unhashed reference signatures with the first unhashed monitored signatures hashing the first unhashed monitored signatures to form a corresponding first hashed monitored signatures and comparing the first hashed monitored signatures with a library of reference hashed signatures to determine the first media event associated with the second time segment of the monitoring data.

Methods and apparatus to optimize reference signature matching using watermark matching

Display device ON/OFF detection methods and apparatus are disclosed. Example display activity detectors disclosed herein are to extract regions from respective ones of captured video frames, the regions corresponding to a depiction of a display of a monitored media device Disclosed example display activity detectors are also to compute a distance metric that is to represent an amount a first one of the regions of a first one of the captured video frames differs from a corresponding second one of the regions of a second one of the captured video frames. Disclosed example display activity detectors are further to compare the distance metric to a threshold to determine whether the monitored media device is ON or OFF.

Display device on/off detection methods and apparatus

Methods, apparatus, systems and articles of manufacture are disclosed selectively generating and storing hashed reference signatures. An example method disclosed herein determining whether watermark coverage of a first media segment satisfies a dropout constraint, the first media segment corresponding to a first monitoring time interval of a media source feed and, when the watermark coverage of the first media segment does not satisfy the dropout constraint hashing first media signatures associated with the first media segment to generate corresponding first hashed signatures and generating first reference data for the first media segment, the first reference data including the first hashed signatures and the first media signatures. The example method further includes, when the watermark coverage of the first media segment satisfies the dropout constraint, generating second reference data for the first media segment, the second reference data including the first media signatures.

Methods and apparatus for optimizing station reference fingerprint loading using reference watermarks

Example apparatus disclosed herein are to cause meter software to be provided to a compute device, the meter software executable by the compute device to monitor use of the compute device associated with presentation of media. Disclosed example solutions are also to collect demographic data of a user associated with the compute device, the demographic data collected from a source different from the compute device. Disclosed example solutions are further to obtain meter data from the compute device, the meter data generated by the meter software, and associate the meter data with the demographic data.

Portable multi-purpose audience measurement systems, apparatus and methods

Methods, apparatus, systems and articles of manufacture to reduce false positive signature matches due to similar media segments in different reference media assets are disclosed. Example apparatus disclosed herein include a signature matcher to compare monitored media signatures with a library of reference media signatures, the monitored media signatures associated with monitored media, the library of reference media signatures including sequences of reference signatures associated with respective reference media assets. Disclosed example apparatus also include a match information identifier to identify a number of different matched reference media assets associated with ones of the sequences of reference media signatures that match a sequence of matched monitored media signatures. Disclosed example apparatus further include a false positive identifier to, in response to the number of different matched reference media assets satisfying a threshold number, eliminate one or more of the matched reference media assets from being credited to the monitored media.

Methods and apparatus to reduce false positive signature matches due to similar media segments in different reference media assets

An example apparatus disclosed herein includes means for collecting demographic data of a user, including a phone number for a mobile device, via a website associated with an information gathering entity, the demographic data collected via the website from a personal computer, separate from the mobile device, used to access the website. The disclosed example apparatus also includes means for sending a message to the mobile device, the sent message, when responded to, resulting in downloading of a metering software module to the mobile device. The disclosed example apparatus further includes means for receiving, from the mobile device and at a system associated with the information gathering entity, information indicative of events associated with use of the mobile device, and means for associating the received information with the demographic data.

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Tampa, FL, United States of America

Dan Nelson