Time-space domain hybrid video noise reduction device and method

Abstract

The invention relates to a time-space domain hybrid video noise reduction device and a time-space domain hybrid video noise reduction method, and belongs to the technical field of video image processing. The device comprises a time domain noise reduction module, a smoothing coefficient storage module, a reference frame storage module and a space domain noise reduction module. The method comprises the following steps that: the time domain noise reduction module calculates noise variance, the motion intensity of a current point and a weighting coefficient of the current point according to the current point and a reference point; the time domain noise reduction module calculates and stores a smoothing coefficient of the current point and a time domain filtering result of a current frame respectively; and the space domain noise reduction module performs space domain filtering to obtain noise-reduced image data. Therefore, the combined application of time domain noise reduction and space domain noise reduction is realized, a good noise reduction effect can be achieved, system overhead required by the noise reduction can be effectively reduced, and system cost is lowered. The noise reduction device is simple in structure; and the noise reduction method can be conveniently and widely applied.

Description

Technical field

[0001] The present invention relates to the technical field of video image processing, and in particular to the technical field of video noise reduction. Specifically, it refers to a video noise reduction device and method that combines time domain and spatial domain. Background technique

[0002] In camera and surveillance systems, the direction of technological development and progress is to ultimately obtain images with as little noise as possible. However, limited by the sensitivity and dynamic range of the photosensitive device, the actual image obtained always contains noise. When the light intensity is weak, the noise will become more obvious, resulting in a decrease in video clarity, which is not conducive to video images. subsequent processing and application. In order to reduce the impact of noise, noise reduction devices are generally used to reduce noise on video images. Noise reduction methods are mainly divided into two categories according to...

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