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Self-adaptive time-space domain cumulative filtering and tone mapping video enhancement method

A tone mapping and video enhancement technology, applied in the field of image processing, which can solve the problems of low gray value and high noise in low-light video

Inactive Publication Date: 2012-02-08
SUN YAT SEN UNIV
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Problems solved by technology

[0005] Aiming at the problem of high noise and low gray value of low-illumination video, an improved adaptive time-space cumulative filtering method is proposed

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[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0038] Aiming at the problem of high noise and low gray value of low-light video, a video enhancement method based on adaptive spatio-temporal cumulative filtering and tone mapping is proposed. For the filtered video, an improved segmental tone mapping function is used Adjust the brightness, and the improved method has a more obvious enhancement effect on low-light video.

[0039] The present invention is mainly divided into two parts. The first part is to extract ...

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Abstract

The invention discloses a self-adaptive time-space domain cumulative filtering and tone mapping video enhancement method. The invention provides an improved self-adaptive time-space domain cumulative filtering method aiming at the problem of large noise and relatively low gray value in a low-illumination video. As for the filtered video, the intensity is adjusted by adopting an improved piecewise tone mapping function; the improved method has relatively obvious enhancement effect on the low-illumination video. The invention takes account of image denoising smooth effect, image clarity and algorithmic time complexity, and has great application value of popularization in video monitoring due to that the method is simple in algorithm, does not need multifarious iteration, and can be easily achieved by VC.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a video enhancement method of adaptive time-space cumulative filtering and tone mapping. Background technique [0002] Video surveillance will systematically introduce noise, especially Gaussian additive noise, during image acquisition. At the same time, due to the underexposure of low-light video, the readout noise will increase when the objective environment brightness decreases. Therefore, it is especially important for video surveillance to quickly and effectively filter out these noises and present the imperceptible details in the image in real time. [0003] Based on a conceptual model of a virtual exposure camera, Eric P.Bennett firstly adopts an adaptive spatio-temporal accumulation filtering method to denoise, and then uses a tone mapping function to adjust the brightness. This self-adaptive space-time accumulative filtering method makes full use of the inform...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/217H04N7/26
Inventor 黄鹏林格王若梅罗笑南
Owner SUN YAT SEN UNIV
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