# US 2017/0102480 A1 · Field of play boundary detection system

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- Number: US 2017/0102480 A1
- Document ID: US20170102480A1
- Status: Published application
- Kind: A1
- Application number: 15/281,521
- Filed: 2016-09-30
- Published: 2017-04-13
- Earliest claimed: 2015-10-09
- Assignees: Stratom, Inc.; Fletcher Group, LLC
- Applicants: Stratom, Inc.; Fletcher Group, LLC
- Inventors: Mark ROSENBLUM; Dan GRAINGE; Dan AMBROSIO; Ryan Matthew DELGIZZI; Jon HARRACH
- Web page: https://patentgrep.com/patent/US20170102480A1

## CPC

- G01V 8/20: using multiple transmitters or receivers
- G06V 10/145: Illumination specially adapted for pattern recognition, e.g. using gratings
- G06V 20/42: {of sport video content}
- A63B 71/0605: {Decision makers and devices using detection means facilitating arbitration}
- G01V: GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS (means for indicating the location of accidentally buried, e.g. snow-buried, persons A63B29/02)
- G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H)

## Abstract

A boundary detection apparatus is provided, including a laser emitter configured to emit at least a portion of a laser curtain in a plane aligned with a sports field boundary; and an imaging camera associated with the sports field boundary. The laser curtain provides a detectable indication on an object crossing the sports field boundary that is captured by the imaging camera.

## Claims

### Claim 1

A boundary detection apparatus, comprising:
a laser emitter configured to emit at least a portion of a laser curtain in a plane aligned with a sports field boundary; and
an imaging camera associated with the sports field boundary,
wherein the laser curtain provides a detectable indication on an object crossing the sports field boundary that is captured by the imaging camera.

### Claim 2 (depends on 1)

The apparatus of claim 1, wherein the laser emitter is configured to emit at a first wavelength and the imaging camera is configured to capture images at the first wavelength.

### Claim 3 (depends on 1)

The apparatus of claim 1, further comprising:
an image processor coupled with the imaging camera that outputs processed images with a visual indication of the object penetrating the laser curtain.

### Claim 4 (depends on 3)

The apparatus of claim 3, wherein:
the laser emitter is configured to emit at a wavelength outside of the visible light spectrum,
the imaging camera images comprises one or more filters sensitive to the wavelength outside of the visible light spectrum,
the imaging camera outputs a filtered image and an unfiltered visible wavelength images that correspond to the filtered image, and
the image processor is configured to overlay the filtered image on the unfiltered image to provide a resultant image that includes the visual indication of the object penetrating the laser curtain.

### Claim 5 (depends on 4)

The apparatus of claim 4, wherein the laser emitter is configured to emit at a near infrared wavelength.

### Claim 6 (depends on 1)

The apparatus of claim 1, wherein the object comprises one or more of a ball, a body part, or piece of equipment.

### Claim 7 (depends on 1)

The apparatus of claim 1, wherein the apparatus comprises a plurality of laser emitters located at different locations around the sports field boundary that each emit at least a portion of the laser curtain in the plane aligned with the sports field boundary.

### Claim 8 (depends on 7)

The apparatus of claim 7, wherein the different locations are selected to reduce occlusions of the object from players or equipment located between one of the laser emitters and the object.

### Claim 9 (depends on 7)

The apparatus of claim 7, wherein the apparatus comprises a plurality of imaging cameras located at a plurality of locations around the sports field boundary.

### Claim 10 (depends on 9)

The apparatus of claim 9, wherein the plurality of locations are selected to reduce occlusions of the object from players or equipment located between one of the imaging cameras and the object.

### Claim 11 (depends on 9)

The apparatus of claim 9, wherein the number of laser emitters is different than the number of cameras.