Fuhuei Huei Lin

US Patent:

8175866, May 8, 2012

Filed:

Mar 12, 2008

Appl. No.:

12/047232

Inventors:

Heyun Huang - Shanghai, CN
Fuhuei Lin - Cupertino CA, US

Assignee:

Spreadtrum Communications, Inc. - George Town, Grand Cayman

International Classification:

G10L 11/04
G10L 19/14

US Classification:

704207, 704205

Abstract:

A method for post-processing of speech signals includes using a pitch correction filter, a pitch weight parameter adjustor, and a first pitch enhancement filter to process the input signal into a first output signal; summing both the input signal and the first output signal as a second output signal; and using a second pitch enhancement filter to process the second output signal. Furthermore, another method for post-processing of speech signals includes using a second pitch enhancement filter to process the input signal into a second output signal; using a pitch correction filter, a pitch weight parameter adjustor, and a first pitch enhancement filter to process the second output signal into a first output signal; and summing both the second output signal and the first output signal as a final output signal. The two methods can simultaneously realize pitch emphasis and enhancement with low computation complexity.

US Patent:

20070206677, Sep 6, 2007

Filed:

Feb 28, 2007

Appl. No.:

11/712845

Inventors:

Yaqiang Ding - Shanghai, CN
Jiang Lin - Shanghai, CN
Fuhuei Lin - Cupertino CA, US

Assignee:

Spreadtrum Communications Corporation - Sunnyvale CA

International Classification:

H04N 11/02
H04N 7/12

US Classification:

375240160, 375240260

Abstract:

This disclosure is related to a fast motion estimation method for implementing in a video encoder. A particular method includes determining early termination based on the value of a sum of absolute difference (SAD). The method also includes performing motion prediction using a motion vector from a previous frame as a prediction point. The method further includes using the prediction point as the center to obtain the integral motion vector by conducting a 3×3 cross searching until a minimum sum of absolute difference (minSAD) is located at the center of the cross and predicting a location of a half-pixel point based upon a point corresponding to the integral motion vector, values of the minimum sum of absolute difference of other four cross points.

US Patent:

20100098348, Apr 22, 2010

Filed:

Nov 10, 2009

Appl. No.:

12/615923

Inventors:

Benhao ZHANG - Shanghai, CN
Xiaoguang Feng - Shanghai, CN
Jing Hu - Shanghai, CN
Fuhuei Lin - Cupertino CA, US

International Classification:

G06K 9/40

US Classification:

382262

Abstract:

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 Φ1, Φ2 and Φ3 for the pixels in each group; calculating a reference luminance Y: Y=Φ2+[(Φ1+Φ3−2*Φ2]*h*[1−k*var], where var=Φ3−Φ1; determining whether the current pixel (cur_pixel) is a bad pixel; letting a temporary variable (tmp_data) be Φ1 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−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−tmp_data| and the value of avoid_over_noise are compared. If |Y−tmp_data|

US Patent:

20100124374, May 20, 2010

Filed:

Nov 10, 2009

Appl. No.:

12/615882

Inventors:

Yi WANG - Shanghai, CN
Fuhuei Lin - Cupertino CA, US

International Classification:

G06K 9/62

US Classification:

382167

Abstract:

The present invention discloses a method for automatically detecting and correcting red eye in a photo taking process. The method utilizes a preview function which all of the current digital cameras have. When flash light is needed during the photo taking process, an image which is closest to the shutter pressing time is read from a preview image sequence and this image is stored. Then, red eye detection is performed according to various related information (e.g., chroma information) of this image and the image actually taken. A correction process is conducted on the detected red eye area. The corrected image is stored as a resulting image in a storage unit in the camera. Therefore, the red eye is removed rapidly and accurately during a single normal exposure process and the image without red eye is thus obtained.