# US 2014/0152975 A1 · Method for dynamically adjusting the operating parameters of a tof camera according to vehicle speed

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- Number: US 2014/0152975 A1
- Document ID: US20140152975A1
- Status: Published application
- Kind: A1
- Application number: 13/693,444
- Filed: 2012-12-04
- Published: 2014-06-05
- Earliest claimed: 2012-12-04
- Assignees: Texas Instruments Incorporated
- Applicants: Texas Instruments Incorporated
- Inventors: Dong-Ik KO
- Web page: https://patentgrep.com/patent/US20140152975A1

## CPC

- G01S 17/894: Three-dimensional [3D] imaging with simultaneous measurement of time-of-flight at a two-dimensional [2D] array of receiver pixels, e.g. time-of-flight cameras or flash lidar
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES

## Abstract

A method for adjusting the modulating frequency and the intensity of the IR illumination of a Time of Flight measurement system proportionally to the speed of movement and the ambient light level of the TOF system, thus adjusting the range of vision of the system dependent on speed. In an alternate embodiment the modulating frequency of a TOF measurement system is periodically adjusted to cover a larger range of vision of the TOF.

## Claims

### Claim 1

A method of adjusting the operating parameters of a Time of Flight (TOF) measurement system comprising the steps of:
receiving a signal indicating the speed of movement of the TOF measurement system;
reducing the modulation frequency of the TOF measurement system proportionally to the increase of the speed of movement of the TOF;
increasing the intensity of the IR illumination level proportionally to the increase of the speed of movement of the TOF;
receiving a signal indicating the level of ambient light;
adjusting the IR illumination level inversely proportionally to the level of the ambient light.

### Claim 2 (depends on 1)

The method of claim 1 wherein:
the signal indicating the speed of movement of the TOF measurement system is a continuously variable signal proportional to the speed.

### Claim 3 (depends on 1)

The method of claim 1 wherein:
the signal indicating the speed of movement of the TOF measurement system is a step function proportional to set speed ranges.

### Claim 4 (depends on 1)

The method of claim 1 further comprising the steps of:
periodically varying the modulation frequency of the TOF measurement system without considering the speed.