Spreadtrum Communications (Shanghai) Co., Ltd.

Benhao Zhang

Fuhuei Lin

Jing Hu

Heyun Huang

Tan Li

Xiaoguang Feng

An audio encoding method and a corresponding decoding method are provided. Accordingly, the pre-echo effect of the audio transient signal is eliminated and the distortion of the transient signal is mitigated. The technical solution includes performing time-domain processing on an input audio transient signal; dividing sampling points x,x, . . . , xof an input frame into L segments; calculating an energy Efor each segment; calculating an average energy Efor each segment of the input frame; calculating a multiplying parameter &#x3bb;corresponding to each segment by virtue of &#x3bb;=r(bitrate)*E/E; multiplying the sampling points of all the segments of the input frame by corresponding multiplying parameter &#x3bb;, obtaining the processed sampling points x',x&#x2032;, . . . , x&#x2032;; and sending the multiplying parameter &#x3bb;to a code stream for transportation; performing time-frequency transformation and coding on the processed sampling points x&#x2032;,x&#x2032;, . . . , x&#x2032; and outputting to the code stream.

Audio encoding/decoding for reducing pre-echo of a transient as a function of bit rate

A method and an apparatus for image denoising based on medium filter is disclosed according to the present invention. Such method and apparatus may be used to remove linear noise and random noise for the sensor, as well as the bad points in the sensor image, and to prevent over-denoising. The technical solutions includes selecting three groups of pixels from neighboring pixels of a current pixel, calculating medians &#x3a6;, &#x3a6;and &#x3a6;for the pixels in each group; calculating a reference luminance Y: Y=&#x3a6;2*&#x3a6;]*h*[1&#x2212;k*var], where var=&#x3a6;; determining whether the current pixel (cur_pixel) is a bad pixel; letting a temporary variable (tmp_data) be &#x3a6;if the current pixel is a bad pixel; letting a temporary variable (tmp_data) be the current pixel value (cur_pixel) if the current pixel is not a bad pixel; determining whether the current pixel is located on an edge. If the current pixel is determined to be located on the edge, the reference luminance Y is limited to a range of [tmp_data&#x2212;edge_limit, tmp_data+edge_limit], the current pixel value is updated with the limited reference luminance Y and the denoising process ends. If the current pixel is determined not to be located on the edge, the value of |Y&#x2212;tmp_data| and the value of avoid_over_noise are compared. If |Y&#x2212;tmp_data|&#x3c;avoid_over_noise, the current pixel value is updated with Y; otherwise, the current pixel value is updated with tmp_data. The above steps for each pixel in the image is repeated. The present invention is applicable to image denoising field.

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Shanghai, China

Benhao Zhang