1
Robert W Schumann, Siu Leong Iu, Kobad Bugwadia, Guillaume Mercier, Shiva Ramadoss, Michael Bergeron, Jack Ehrhardt: System and methodology for tracing to a source of unauthorized copying of prerecorded proprietary material, such as movies. Digital Video Express, McDermott Will & Emery, September 4, 2001: US06285774 (188 worldwide citation)

To enable the source of an unauthorized copy of an information-bearing medium, such as a video DVD, to be traced, a compressed digital signal stream to be stored on the medium is altered to include “running marks,” that comprise pixel blocks changing in position frame by frame and encoded with infor ...


2
Robert Wilhelm Schumann, Richard Whittemore, David Mosche Goldschlag, David William Kravitz, Siu Leong Iu, Guillaume Mercier, Michael Bergeron, Jack Ehrhardt, Richard Vitkus: Digital content distribution system and method. Digital Video Express, David G Grossman, January 9, 2007: US07162642 (118 worldwide citation)

A content distribution system and method which prevents unauthorized access to secured content such as movies and music. The apparatus includes a source, a receiver, an authorized security device such as a conditional access module (CAM) for decrypting authorized content, an output device for output ...


3
Siu Leong Iu: Video signal noise reduction system using time-varying filter coefficients. Matsushita Electric Corporation of America, Ratner & Prestia, August 15, 1995: US05442407 (85 worldwide citation)

A video signal noise reduction system is disclosed in which corresponding image pixels from a current frame and image pixels from a noise reduced previous frame are averaged to produce respective noise reduced pixel values. In the disclosed exemplary embodiment of the invention, a processed frame me ...


4
Saiprasad V Naimpally, Siu Leong Iu, Hee Yong Kim: High-definition video encoding system having color-sensitive quantization. Matsushita Electric Corporation of America, Ratner & Prestia, March 15, 1994: US05294974 (78 worldwide citation)

A video signal encoder uses an encoding system such as that developed by the Moving Picture Experts Group (MPEG). A key component of this encoding system increases the quantization step size of image data, thus decreasing its quantization resolution, to reduce the number of bits used to encode the d ...


5
Siu Leong Iu: Noise reduction system using multi-frame motion estimation, outlier rejection and trajectory correction. Matsushita Electric Corporation of America, Ratner & Prestia, November 1, 1994: US05361105 (54 worldwide citation)

In a video signal noise reduction system, image pixels are tracked across multiple frames and then averaged to produce respective noise reduced pixel values. A motion estimator identifies a motion block within several video frames and determines an approximate velocity vector using a trimmed square ...


6
Siu Leong Iu, Wai Chu: Secure oblivious watermarking using key-dependent mapping functions. Digital Video Express, David G Grossman, May 31, 2005: US06901514 (49 worldwide citation)

A method for embedding a watermark into content is disclosed. The content contains content samples. The method including the steps of: receiving the content, creating a continuous watermark sequence from the watermark, and for each content sample in a first predetermined order: calculating a sample ...


7
Siu Leong Iu, Yun Ting Lin: Motion field modeling and estimation using motion transform. Digital Video Express, David G Grossman, December 2, 2003: US06658059 (45 worldwide citation)

A motion transform is implemented for calculating the motion field between two images. An optical flow calculator is configured for generating an image motion vector field by iteratively comparing a predicted image with a second image frame, the predicted image being produced based upon a first memo ...


8
Siu Leong Iu: Apparatus for reducing quantization artifacts in an interframe hybrid coding system with motion compensation. Matsushita Electric Corporation of America, Ratner & Prestia, October 5, 1993: US05251028 (35 worldwide citation)

Apparatus for reducing halos at moving edges adjacent flat areas in successive images produced by a system using differential pulse code modulation with motion compensation in which the output of a DCT is quantized by reducing the size of the quantization steps in those areas of the image which are ...


9
Robert Wilhelm Schumann, Richard Whittemore, David Moshe Goldschlag, David William Kravitz, Siu Leong Iu, Guillaume Mercier, Michael Bergeron, Jack Ehrhardt, Richard Vitkus: Digital content distribution system and method. Dolby Laboratories Licensing Corporation, April 13, 2010: US07698570 (22 worldwide citation)

A content distribution system and method which prevents unauthorized access to secured content such as movies and music. The system includes a source, a receiver, an authorized security device such as a conditional access module (CAM) for decrypting authorized content and an output device for output ...


10
Siu Leong Iu: Method and apparatus for estimating motion vector fields by rejecting local outliers. Matsushita Electric Industrial Corporation of America, Ratner & Prestia, November 28, 1995: US05471252 (20 worldwide citation)

An image analysis system generates a motion vector field from first and second images in a sequence of steps. First, random, initial motion vector values are assigned to each pixel in the image frame. Next, an objective function is defined for each motion vector and its corresponding motion vector i ...



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