Patent ID: 8630356

Claim:
A video loop filter, comprising: a parameter estimation unit configured to determine means and variances from a pilot frame; a filter unit configured to receive quantized residual coefficients in video coding process, and restore coefficients from the quantized residual coefficients and the determined means and variances; and an inverse Integer Cosine Transform (ICT) unit configured to apply an inverse ICT to the restored coefficients to obtain a filtered frame, wherein the filter unit is configured to determine the restored coefficients according to: x ^ 0 = x _ 0 + σ x 0 2 σ x 0 2 + σ n 0 2 ⁢ ( y 0 - x _ 0 ) , where {circumflex over (x)} 0 represents the restored coefficients; and x 0 and σ x 0 2 represent the determined means and variances, respectively, and y 0 represents the quantized residual coefficients.