Automatic dimming method and device of infrared camera

Abstract

The invention discloses an automatic dimming method and device of an infrared camera. The brightness of an LED (Light-Emitting Diode) lamp group is adjusted according to the brightness of the area of a moving target in a video picture, so that a sharp image of the most-concerned moving target is obtained. The brightness of an infrared lamp is adjusted by comparing the brightness of the area of the moving target with brightness of a background area as well as whether the moving target is over-exposed or over-dark, so that the brightness level of the infrared lamp can be accurately controlled, and the situation that the details of the moving target are vague caused by over-exposure or over-darkness of a future target is avoided. In the traffic field, only the judgment on whether to be over-exposed or over-dark is carried out on a license plate area instead of the judgment on the whole image, so that the brightness of the LED lamp group can be more accurately controlled to obtain useful details of a license plate. The invention has the advantages that photoelectric conversion of the LED lamp can be effectively controlled, the brightness of the LED lamp is intelligently controlled, the resolution ratio of the details of the moving target is effectively increased, the heat consumption of the infrared lamp is reduced and the service life of the whole device is prolonged.

Description

technical field [0001] The invention relates to the technical field of security monitoring, in particular to a device and method for automatically adjusting the brightness of an infrared lamp. Background technique [0002] Monitoring is the basic means of security prevention. With the development of the industry, security technology has received more and more attention from all aspects of society, and security monitoring has gradually become the focus of social demand. The advent of infrared camera technology has greatly promoted the promotion of security monitoring in the field of low-light monitoring, but the service life, heat dissipation and overexposure of infrared lamps have always been the bottleneck of the development of LED infrared cameras. [0003] The methods for the existing infrared camera to automatically adjust the brightness of the infrared light in the field of security monitoring include the following schemes: [0004] Option 1, the LED light group includ...

AI Technical Summary

Problems solved by technology

The advent of infrared camera technology has greatly promoted the promotion of security monitoring in the field of low-light monitoring, but the service life, heat dissipation and overexposure of infrared lamps have always been the bottleneck of the development of LED infrared cameras.

However, since this solution only focuses on the central part of the entire image, if the moving target is not in the center of the scene, the moving target we focus on after the dimming will instead be overexposed or too dark

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