Calibration method, laser emission module, depth camera and electronic equipment

Abstract

The application discloses a calibration method, a laser emission module, a depth camera and electronic equipment. The calibration method comprises steps: acquiring a current temperature and a currentcurrent value of a current laser transmitter; acquiring a preset temperature-current-optical power relation curve according to the current temperature; calculating a current optical power according tothe current current value and the preset temperature-current-optical power relation curve; acquiring a target current value according to preset linear functions of the optical power and the current and the target optical power of the current laser emitter; and using the target current value as a current value of the current laser transmitter at next time to enable the current optical power to reach the target optical power under the condition that the current optical power is different from the target optical power. According to the application, the working current of the current laser emitter is adjusted to be the target current value according to the preset temperature-current-optical power relation curve and thus the optical powers of different current laser emitters reach the target optical power, so that a problem of optical power consistency deviation is solved. Therefore, the safety of human eyes is protected.

Description

technical field [0001] The present application relates to the field of optical imaging, in particular to a calibration method, a laser emitting module, a depth camera and electronic equipment. Background technique [0002] For structured light equipment, different temperatures will cause differences in the luminous power (hereinafter referred to as optical power) of the laser transmitters in the structured light equipment, resulting in consistent differences in optical power among multiple different laser transmitters of the same model. When multiple mobile phones of the same model are turned on within a certain period of time, the temperature of the laser transmitter (same model) of the structured light device in each mobile phone will change, resulting in inconsistent optical power of the laser transmitters of the same model but different mobile phones. Generate optical power consistency deviation. Consistency deviation of optical power will bring about human eye safety p...

AI Technical Summary

Problems solved by technology

[0002] For structured light equipment, different temperatures will cause different luminous power (hereinafter referred to as optical power) of the laser transmitter in the structured light equipment, resulting in consistent differences in optical power among multiple different laser transmitters of the same model

When multiple mobile phones of the same model are turned on within a certain period of time, the temperature of the laser transmitter (same model) of the structured light device in each mobile phone will change, resulting in inconsistent optical power of the laser transmitters of the same model but different mobile phones. Generate optical power consistency deviation

Consistency deviation of optical power will bring about human eye safety problems. Specifically, the safety thresholds of optical power of laser transmitters in different mobile phones with the same model are the same. When the currents of laser transmitters in different mobile phones are constant and At the same time, the optical power of the laser transmitter at low temperature will be higher than the optical power of the laser transmitter at high temperature, resulting in a low eye safety margin of the laser transmitter at low temperature, which is easy to hurt human eyes

Images