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VIDEO DENOISING BASED ON A LOCAL GAUSSIAN DISTRIBUTION IN 3-D COMPLEX WAVELET DOMAIN

Authors
  • Hossein Rabbani
  • Mansur Vafadust
Conference دوازدهمین کنفرانس بین‌المللی سالانه انجمن کامپیوتر ایران
Abstract In this paper we present a new video denoising algorithm that model distribution of wavelet coefficients in each subband with a Gaussian probability density function (pdf) that its variance is local (It means that we use a separate Gaussian pdf for each pixel of each subband). This pdf is capable of modeling the heavy-tailed nature of wavelet coefficients and the empirically observed correlation between the coefficient amplitudes. Within this framework, we describe a novel method for video denoising based on designing a maximum a posteriori (MAP) estimator, which relies on the zero-mean Gaussian random variables with high local correlation. Because separate 3-D transforms, such as ordinary 3-D wavelet transforms, have visual artifacts that reduce their performance in applications, we perform our algorithm in 3-D complex wavelet transform. This non-separable and oriented transform produces a motion-based multiscale decomposition for video that isolates motion along different directions in its subbands and prevents from directions mixing that appear in subbands of 3-D ordinary wavelet transform. In addition, we use our denoising algorithm in 2-D complex wavelet transform, where the 2-D transform is applied to each frame individually. Although our method is simple in its implementation, our denoising results achieve better performance than several methods visually and regarding peak signal-to-noise ratio (PSNR).
قیمت
  • برای اعضای سایت : 100,000 Rial
  • برای دانشجویان عضو انجمن : 20,000 Rial
  • برای اعضای عادی انجمن : 40,000 Rial

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