Method and device for improving image brightness based on background modeling under low-illuminance scene

Abstract

The invention discloses a method and a device for improving image brightness based on background modeling under a low-illuminance scene. According to the method and the device which are provided by the invention, background modeling (such as Gaussian distribution) is carried out on a high-illuminance scene (such as daytime) and motion detection background modeling is carried out on the low-illuminance scene (such as night) respectively, a night background is corrected by the obtained daytime background, and after a motion target of the night scene is extracted, the motion target is fused in the corrected night background to complete a video image under the correction night scene. By adopting the method and the device, details, which cannot be captured at night by a video surveillance camera, can be recovered, so that the brightness of a night picture monitored by a video is remarkably improved and the detail distinguishing degree is increased so as to facilitate manual interpretation.

Description

technical field [0001] The present invention relates to the technical field of video surveillance, in particular to a method and device for enhancing image brightness based on background modeling in low-illuminance scenes. Background technique [0002] In low-illumination scenarios, such as at night when the illumination is low, the brightness of the video images returned by the video surveillance cameras is usually low, and the contrast is also reduced, which is not convenient for manual interpretation. In the prior art, the histogram transformation method and the Retinex algorithm are usually used to enhance the image brightness, wherein: [0003] The histogram transformation method increases the contrast of the night picture by increasing the dynamic range of the histogram, thereby increasing the recognition of picture details. However, because this algorithm only uses the image information of the current frame, it cannot restore the details lost due to low illumination. ...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the brightness of the video surveillance camera returned by the video surveillance camera is relatively dark when the ambient illumination is insufficient, such as at night, which is not convenient for manual interpretation, the purpose of the embodiments of the present invention is to provide a method based on background modeling in low-illuminance scenes. Method and device for improving image brightness

Images