Seagate Technology Incorporated

Nanyang Technological University

Ncs Pte, Ltd.

GuoQing Zhang

MingZhong Ding

Qiang Bi

Xiang Lu

WenJun Cao

KianKeong Ooi

Kian Keong Ooi

Xuan Jing

Lou Supino

Weisi Lin

Arun Kumar Chandran

Chan Fan Lau

Hoang Dung Vu

In some aspects, a method for object re-identification may include obtaining a first set of images from a first camera, and a second set of images from at least one second camera; determining a first set of features based on the first set of images, the first set of features lying in a first feature space; and determining a second set of features based on the second set of images, the second set of features lying in a second feature space. The method may additionally include determining a first feature projection matrix and a second feature projection matrix that respectively map the first set of features and the second set of features to a shared feature space; and determining a common dictionary based on the shared feature space.

Object re-identification using multiple cameras

An apparatus includes a disk locked clock system and a feedforward microactuator compensator. The disk locked clock system is configured to estimate a timing error and generate a timing error signal. The feedforward microactuator compensator is configured to generate a microactuator compensation signal, without use of a vibration sensor signal, in response to the timing error signal.

Vibration compensation using disk locked clock error

An apparatus includes a frequency analyzer circuitry, filter circuitry, and voice coil motor (VCM) control circuitry. The frequency analyzer circuitry is configured to detect one or more dominant frequencies of a position error signal (PES). The filter circuitry is configured to identify one or more filters in response to detecting the one or more dominant frequencies, apply the one or more identified filters to at least one of a microactuator control signal and PES, and generate a VCM compensation signal in response to the filtered PES or the microactuator control signal. The VCM control circuitry is configured to generate a VCM control signal in response to the VCM compensation signal.

Adaptive attenuation for disturbance compensation

An apparatus includes a microactuator controller configured to generate a microactuator control signal, a feedforward microactuator compensator configured to generate a microactuator compensation signal, and a microactuator model filter configured to filter a modified microactuator control signal. The microactuator compensation signal is configured to be injected into the microactuator control signal to generate the modified microactuator control signal. The microactuator model filter generates a filtered modified microactuator control signal and injects the filtered modified microactuator control signal into a position error signal to generate a modified position error signal.

Disturbance compensation for dual-stage servo system using vibration sensor

An apparatus comprises a controller configured to detect a seek failure of a read/write head. The controller is additionally configured to perform a seek recovery operation in accordance with a recovery sequence in response to the seek failure; the recovery sequence comprising a plurality of recovery procedures. Further, the controller is configured to determine if the seek recovery operation is successful and determine which of the recovery procedures provided the success. And, the controller is configured to dynamically calculate the success rate of each recovery procedure, modify the recovery sequence based on the success of the seek recovery operation and based on the success rate of recovery procedures providing the success.

Dynamic configuration of seek recovery in a disk drive

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Singapore, Singapore

GuoQing Zhang