# US 12,217,507 B2 · Vehicle monitoring method and monitoring system

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,217,507 B2
- Document ID: US12217507B2
- Status: Granted
- Kind: B2
- Application number: 17/911,004
- Filed: 2020-12-28
- Published: 2023-03-30
- Granted: 2025-02-04
- Earliest claimed: 2020-03-20
- Assignees: Zhejiang Uniview Technologies Co., Ltd.
- Applicants: Zhejiang Uniview Technologies Co., Ltd.
- Inventors: Guozhen Wang; Ping Xu
- Web page: https://patentgrep.com/patent/US12217507B2

## CPC

- G06V 20/50: Context or environment of the image
- H04N 7/18: Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
- G01J 4/04: Polarimeters using electric detection means (G01J4/02 takes precedence)
- G02B 27/281: {used for attenuating light intensity, e.g. comprising rotatable polarising elements}
- G06T 7/70: Determining position or orientation of objects or cameras (camera calibration G06T7/80)
- G06V 10/36: Applying a local operator, i.e. means to operate on image points situated in the vicinity of a given point; Non-linear local filtering operations, e.g. median filtering
- H04N 7/183: {for receiving images from a single remote source}
- G06T 2207/10016: Video; Image sequence
- G06T 2207/30244: Camera pose
- G06T 2207/30256: Lane; Road marking
- G06V 2201/08: Detecting or categorising vehicles
- G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL

## Abstract

Provided are a vehicle monitoring method and a vehicle monitoring system. The vehicle monitoring method includes that: a polarization angle of polarized light in a sky image reflected by a vehicle window in a monitoring scenario is calculated, and a light-filtering polarization angle is calculated according to the polarization angle of the polarized light in the sky image reflected by the vehicle window, where the polarized light in the sky image is formed by scattered sunlight in a sky region corresponding to the sky image; the polarized light in the sky image reflected by the vehicle window in the monitoring scenario is filtered out according to the light-filtering polarization angle; and the monitoring scenario is imaged to form a monitoring image.

## Claims

### Claim 1

A vehicle monitoring method, comprising:
calculating a polarization angle of polarized light in a sky image reflected by a vehicle window in a monitoring scenario, and calculating a light-filtering polarization angle according to the polarization angle of the polarized light in the sky image reflected by the vehicle window, wherein the polarized light in the sky image is formed by scattered sunlight in a sky region corresponding to the sky image;
filtering out the polarized light in the sky image reflected by the vehicle window in the monitoring scenario according to the light-filtering polarization angle; and
imaging the monitoring scenario to form a monitoring image.

### Claim 2 (depends on 1)

The method of claim 1, wherein calculating the polarization angle of the polarized light in the sky image reflected by the vehicle window in the monitoring scenario comprises:
determining an incident angle of the sunlight;
determining an incident angle of scattered sunlight formed in the sky region corresponding to the sky image; and
calculating a polarization angle of the polarized light formed by the scattered sunlight in the sky region corresponding to the sky image, and determining the polarization angle of the polarized light in the sky image.

### Claim 3 (depends on 2)

The method of claim 2, wherein determining the incident angle of the sunlight comprises:
acquiring current time;
acquiring a geographic position where a vehicle monitoring system is located; and
determining the incident angle of the sunlight according to pre-established mapping relations between a time parameter and the incident angle of the sunlight and between a geographic position parameter and the incident angle of the sunlight.

### Claim 4 (depends on 2)

The method of claim 2, wherein determining the incident angle of the scattered sunlight formed in the sky region corresponding to the sky image comprises:
determining a pitch angle of the vehicle window;
determining a direction angle of the vehicle window;
determining a position of a camera in a vehicle monitoring system relative to the vehicle window; and
determining the incident angle of the scattered sunlight formed in the sky region corresponding to the sky image according to the pitch angle of the vehicle window, the direction angle of the vehicle window, and the position of the camera in the vehicle monitoring system relative to the vehicle window.

### Claim 5 (depends on 4)

The method of claim 4, wherein determining the pitch angle of the vehicle window comprises:
acquiring an image of a vehicle;
recognizing a style of the vehicle according to the image of the vehicle; and
determining the pitch angle of the vehicle window according to a pre-established mapping relation between the style of the vehicle and the pitch angle of the vehicle window.

### Claim 6 (depends on 4)

The method of claim 4, wherein determining the direction angle of the vehicle window comprises:
acquiring an orientation of a road where a vehicle is located, and determining an orientation of the vehicle; and
determining an azimuth angle of the vehicle window according to the orientation of the vehicle.

### Claim 7 (depends on 2)

The method of claim 2, wherein determining the incident angle of the scattered sunlight formed in the sky region corresponding to the sky image comprises:
determining a pitch angle of the vehicle window;
determining a direction angle of the vehicle window;
determining an incident angle of scattered sunlight formed in a sky region directly opposite the vehicle window according to the pitch angle of the vehicle window and the direction angle of the vehicle window; and
determining the incident angle of the scattered sunlight formed in the sky region directly opposite the vehicle window as the incident angle of the scattered sunlight formed in the sky region corresponding to the sky image.

### Claim 8 (depends on 7)

The method of claim 7, wherein determining the pitch angle of the vehicle window comprises:
acquiring an image of a vehicle;
recognizing a style of the vehicle according to the image of the vehicle; and
determining the pitch angle of the vehicle window according to a pre-established mapping relation between the style of the vehicle and the pitch angle of the vehicle window.

### Claim 9 (depends on 7)

The method of claim 7, wherein determining the direction angle of the vehicle window comprises:
acquiring an orientation of a road where a vehicle is located, and determining an orientation of the vehicle; and
determining an azimuth angle of the vehicle window according to the orientation of the vehicle.

### Claim 10 (depends on 7)

The method of claim 7, wherein determining the pitch angle of the vehicle window comprises:
acquiring an image of a vehicle;
recognizing a style of the vehicle according to the image of the vehicle; and
determining the pitch angle of the vehicle window according to a pre-established mapping relation between the style of the vehicle and the pitch angle of the vehicle window.

### Claim 11 (depends on 7)

The method of claim 7, wherein determining the direction angle of the vehicle window comprises:
acquiring an orientation of a road where a vehicle is located, and determining an orientation of the vehicle; and
determining an azimuth angle of the vehicle window according to the orientation of the vehicle.

### Claim 12 (depends on 1)

The method of claim 1, wherein the light-filtering polarization angle is perpendicular to the polarization angle of the polarized light in the sky image.

### Claim 13

A vehicle monitoring system, comprising:
a light-filtering polarization angle calculation system, which is configured to calculate a polarization angle of polarized light in a sky image reflected by a vehicle window in a monitoring scenario, and calculate a light-filtering polarization angle according to the polarization angle of the polarized light in the sky image reflected by the vehicle window, wherein the polarized light in the sky image is formed by scattered sunlight in a sky region corresponding to the sky image;
a polarization light-filtering system, which is configured to filter out the polarized light in the sky image reflected by the vehicle window in the monitoring scenario according to the light-filtering polarization angle; and
an imaging system, which is configured to image the monitoring scenario to form a monitoring image.

### Claim 14 (depends on 11)

The vehicle monitoring system of claim 11, wherein the polarization light-filtering system comprises a polarizer and a drive motor, wherein the drive motor drives the polarizer to adjust a transmission axis of the polarizer to the light-filtering polarization angle according to the light-filtering polarization angle calculated by the light-filtering polarization angle calculation system.