Ambrish Tyagi

US Patent:

20130076866, Mar 28, 2013

Filed:

Jul 3, 2012

Appl. No.:

13/541399

Inventors:

John Drinkard - Freemont CA, US
Ambrish Tyagi - Palo Alto CA, US
Yoshiharu Tani - Yoshiharu, JP
Koichi Kinoshita - Kyoto, JP

Assignee:

OMRON CORPORATION - Kyoto

International Classification:

H04N 7/18

US Classification:

348 47

Abstract:

According to one aspect of the teachings presented herein, a machine vision system includes one or more sensor units that are each advantageously configured to use different pairings among a set of spaced-apart image sensors, to provide redundant object detection for a primary monitoring zone, while simultaneously providing for the detection of objects that may shadow the primary monitoring zone. Further, a plurality of “mitigations” and enhancements provide safety-of-design and robust operation. Such mitigations and enhancements include, for example, bad-pixel detection and mapping, cluster-based pixel processing for improved object detection, test-image injection for fault detection, dual-channel, redundant processing for safety-critical object detection, temporal filtering to reduce false detections, and the use of high dynamic range (HDR) images, for improved operation over variable ambient lighting conditions.

US Patent:

20130300835, Nov 14, 2013

Filed:

May 13, 2013

Appl. No.:

13/892907

Inventors:

Ambrish Tyagi - Palo Alto CA, US
John Drinkard - Foster City CA, US
Yoshiharu Tani - Kusatsu, JP

International Classification:

G09G 1/00
H04N 13/02
G06T 7/00

US Classification:

348 46, 382154

Abstract:

In one aspect, this disclosure presents a method and apparatus for verifying that minimum object contrast requirements are met within a region representing a volume to be monitored by a machine vision system. In complementary fashion, the disclosure also presents a methodology for constraining the positions of the lighting sources to be used for illuminating the monitored volume at a minimum height above the floor, and for the use of a key light that provides asymmetrical lighting within the monitored volume relative to the camera(s) used for imaging the monitored volume. Correspondingly, the disclosure also presents a method and apparatus for monitoring for proper operation of the key light and responding to improper operation. The minimum contrast verification and key light monitoring operations can be implemented using standalone apparatuses, or can be incorporated into the machine vision system.

US Patent:

20110242283, Oct 6, 2011

Filed:

Mar 30, 2011

Appl. No.:

13/075214

Inventors:

Ambrish Tyagi - Palo Alto CA, US
John Drinkard - Foster City CA, US

International Classification:

H04N 13/02

US Classification:

348 46, 348E13074

Abstract:

In one aspect of the teachings herein, a 3D imaging apparatus uses a “texture tool” or facilitates the use of such a tool by an operator, to add artificial texture to a scene being imaged, for 3D imaging of surfaces or background regions in the scene that otherwise lack sufficient texture for determining sufficiently dense 3D range data. In at least one embodiment, the 3D imaging apparatus provides for iterative or interactive imaging, such as by dynamically indicating that one or more regions of the scene require artificial texturing via the texture tool for accurate 3D imaging, and then indicating whether or not the addition of artificial texture cured the texture deficiency and/or whether any other regions within the image require additional texture.

US Patent:

20190273837, Sep 5, 2019

Filed:

Mar 7, 2019

Appl. No.:

16/295557

Inventors:

- Seattle WA, US
Eduard Oks - Holon IL, US
Rohith Mysore Vijaya Kumar - Sunnyvale CA, US
Apoorv Chaudhri - Sunnyvale CA, US
Yadunandana Nagaraja Rao - Sunnyvale CA, US
Ambrish Tyagi - Palo Alto CA, US

International Classification:

H04N 1/21

Abstract:

Devices, systems and methods are disclosed for reducing a perceived latency associated with uploading and annotating video data. For example, video data may be divided into video sections that are uploaded individually so that the video sections may be annotated as they are received. This reduces a latency associated with the annotation process, as a portion of the video data is annotated before an entirety of the video data is uploaded. In addition, the annotation data may be used to generate a master clip table and extract individual video clips from the video data.

US Patent:

20150271474, Sep 24, 2015

Filed:

Mar 18, 2015

Appl. No.:

14/661603

Inventors:

- Kyoto, JP
John Drinkard - Foster City CA, US
Ambrish Tyagi - Palo Alto CA, US

International Classification:

H04N 13/02
G06T 7/00

Abstract:

According to one aspect of the teachings herein, a method and apparatus detect mechanical misalignments in a machine vision system during run-time operation of the machine vision system, and compensate image processing based on the detected misalignments, unless the detected misalignments are excessive. Excessive misalignments may be detected by determining a worst-case error based on them. If the worst-case error exceeds a defined limit, the machine vision system transitions to a fault state. The fault state may include disrupting operation of a hazardous machine or performing one or more other fault-state operations. Among the detected misalignments are internal misalignments within individual cameras used for imaging, and relative misalignments between cameras. The method and apparatus may further perform run-time verifications of focus and transition the machine vision system to a fault state responsive to detecting insufficient focal quality.