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Spatio-temporal video contrast enhancement

机译:时空视频对比度增强

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A video contrast enhancement algorithm which automatically enhances the contrast of a video using spatial and temporal information is proposed. The algorithm is based on the observation that the contrast in a video frame can be improved by increasing the grey-level differences between each pixel of the video frame and its neighbouring pixels. Furthermore, such an improvement should be smooth in between consecutive video frames so that continuum of contrast improvement is achieved. A two-dimensional (2D) histogram of a video frame is constructed using mutual relationship between each pixel and its neighbouring pixels. For each video frame, a 2D target histogram is computed by considering 2D histogram of the video frame, 2D uniformly distributed histogram, and the 2D histograms of forward and backward neighbouring video frames. The contrast enhancement of the video frame is achieved by mapping the diagonal elements of the 2D input histogram to the diagonal elements of the 2D target histogram. The proposed algorithm is easy to implement and is thus suitable for real-time contrast enhancement applications.
机译:提出了一种视频对比度增强算法,该算法利用空间和时间信息自动增强视频的对比度。该算法基于以下观察结果:可以通过增加视频帧的每个像素与其相邻像素之间的灰度级差异来改善视频帧的对比度。此外,这种改进在连续的视频帧之间应该是平滑的,从而实现对比度的连续改进。使用每个像素与其相邻像素之间的相互关系构造视频帧的二维(2D)直方图。对于每个视频帧,通过考虑视频帧的2D直方图,2D均匀分布的直方图以及前后相邻视频帧的2D直方图来计算2D目标直方图。通过将2D输入直方图的对角元素映射到2D目标直方图的对角元素,可以实现视频帧的对比度增强。所提出的算法易于实现,因此适合于实时对比度增强应用。

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    《Image Processing, IET》 |2013年第6期|543-555|共13页
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