# US 12,603,976 B2 · Foundation projection line-drawing device and a line-drawing method for a sports field

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- Number: US 12,603,976 B2
- Document ID: US12603976B2
- Status: Granted
- Kind: B2
- Application number: 17/993,958
- Filed: 2022-11-24
- Published: 2024-05-09
- Granted: 2026-04-14
- Earliest claimed: 2022-11-07
- Applicants: Bingrong Gu
- Inventors: Bingrong Gu
- Web page: https://patentgrep.com/patent/US12603976B2

## CPC

- H04N 9/3129: {scanning a light beam on the display screen (scanning a light beam on a screen in displays other than projection devices G09G3/02; scanning systems in general G02B26/10; projectors using laser light sources in general H04N9/3161)}
- H04N 9/3182: {Colour adjustment, e.g. white balance, shading or gamut (white balance per se H04N9/73; control of amplitude of colour signals H04N9/68; colour control circuits for displays in general G09G5/02, G09G3/2003, G09G3/3607)}
- G06T 7/246: using feature-based methods, e.g. the tracking of corners or segments
- H04N 9/3185: {Geometric adjustment, e.g. keystone or convergence (optical or mechanical adjustment of convergence H04N9/317; using scanning means H04N3/22; optical or mechanical adjustments of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/14)}
- H04N 9/3194: {including sensor feedback}
- G06T 2207/10048: Infrared image
- G06T 2207/30024: Cell structures in vitro; Tissue sections in vitro
- G06T 2207/30224: Ball; Puck
- G06T 2207/30241: Trajectory
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL

## Abstract

A line-drawing method for a sports field comprises: the foundation projection line-drawing device obtaining court options input by a user, and obtaining a court size and court shape according to the court options; scanning a pre-projection site to determine the safety of the pre-projection site; if the pre-projection site is safe, using the current pre-projection site as a target projection site, and turning on a laser unit according to the court size and the court shape to form a virtual court, and projecting the virtual court on the target projection site. This method can be used in the field lines of sports ball games. It can frame functional areas, replacing traditional marking lines and rope frame lines. It is more flexible and practical than fixed marking lines. It is strong, and it also solves the disadvantages of the site rope being unsafe, and being blown by the wind.

## Claims

### Claim 1

A line-drawing method for a sports field comprises:
obtaining court options input by a user, and obtaining a court size and court shape according to the court options;
scanning the range of the pre-projection site to judge a flatness of the pre-projection site;
if the flatness of the pre-projection site meets the requirements, continue to judge whether there is water or sundries in the pre-projection site;
if there is water in the pre-projection site, a drying device is used to remove the water;
if there are sundries in the pre-projection site, remove the sundries;
using the current pre-projection site as a target projection site, and turning on a laser unit according to the court size and the court shape to form a virtual court, and projecting the virtual court on the target projection site.

### Claim 2 (depends on 1)

The line-drawing method according to claim 1, wherein after scanning the range of the pre-projection site to judge a flatness of the pre-projection site, further comprises:
if the flatness of the pre-projection site does not meet the requirements, send feedback information to the user to reduce the projection range, or send prompt information to the user to shift the projection site.

### Claim 3 (depends on 2)

The line-drawing method according to claim 2, wherein if the flatness of the pre-projection site does not meet the requirements, send feedback information to the user to reduce the projection range, or send prompt information to the user to shift the projection site, comprises:
if the flatness of the pre-projection site does not meet the requirements, then further determine the position of the non-flat area relative to the pre-projection site;
if the non-flat area is at the edge of the pre-projection site, sending feedback information to the user to reduce the projection range;
if the non-flat area is in the middle of the pre-projection site, sending a prompt information to the user to shift the projection site.

### Claim 4 (depends on 1)

The line-drawing method according to claim 1, wherein further comprises:
obtaining the position of a ball, and determining whether the ball presses the line or goes out of bounds according to the position of the ball and the frame line of the court;
if the ball presses the line or goes out of bounds, sending a warning information to the user.

### Claim 5 (depends on 4)

The line-drawing method according to claim 4, wherein the warning information comprises sound information or light information;
if the ball presses the line or goes out of bounds, sending a warning information to the user comprises:
sending a first sound information to the user if the ball goes out of bounds, sending a second sound information to the user if the ball presses the line; or,
transforming a color of the virtual court to a first color if the ball goes out of bounds, transforming the color of the virtual court to a second color if the ball presses the line; or,
sending the first sound information to the user if the ball goes out of bounds, transforming the color of the virtual court to the second color if the ball presses the line; or,
transforming a color of the virtual court to a first color if the ball goes out of bounds, sending a second sound information to the user if the ball presses the line.

### Claim 6 (depends on 5)

The line-drawing method according to claim 5, wherein the first sound information is “out of bounds” information, the second sound information is “line pressure” information, the first color is red, and the second color is green.

### Claim 7 (depends on 4)

The line-drawing method according to claim 4, wherein obtaining the position of a ball, and determining whether the ball presses the line or goes out of bounds according to the position of the ball and the frame line of the court comprises:
acquiring a court image, and obtains the position of the ball according to the court image to determine whether the ball presses the line or goes out of bounds; wherein, the court image comprises a visible light image or an infrared image, and the court image comprises a ball image and the frame line of the court;
if the court image is the visible light image, analyzing the court image to obtain the ball image, and determining the position of the ball relative to the frame line of the court according to the court image, so as to determine whether the ball presses the line or goes out of bounds;
if the court image is the infrared image, analyzing the court image, and determining the position of the ball relative to the frame line of the court according to the temperature of the ball, so as to determine whether the ball presses the line or goes out of bounds.

### Claim 8 (depends on 1)

The line-drawing method according to claim 1, wherein a sensing area is set around the virtual court, and a sensing tag is set on the ball; wherein, when the ball enters the sensing area, the sensing tag inside the ball will be activated;
if receiving the sensing information sent by the ball, the ball will cross the boundary and send the warning information to the user.