Company Filing History:
3 out of 633 
1 out of 2 
1 out of 4 Years Active: 2002-2006
Title: Siu Chung Tam: Innovator in Digital Watermarking and Laser Technology
Introduction
Siu Chung Tam is a prominent inventor based in Singapore, known for his contributions to digital watermarking and laser technology. With a total of 5 patents, he has made significant strides in enhancing multimedia copyright protection and improving laser systems.
Latest Patents
One of his latest patents focuses on methods for embedding image, audio, and video watermarks in digital data. This innovative method allows for the embedding of an entire watermark sequence within another data sequence while minimizing data quality loss. The technique utilizes the de-correlation property of data coefficients in the orthogonal transform domain, similar to data compression through transform coding. The invention employs a Discrete Cosine Transform as the embedding domain, although other orthogonal transforms such as Fourier, Walsh-Hadamard, Haar, Sine, and Wavelet can also be utilized. A unique key derived from spatial locations is used to unlock or de-watermark the embedded sequences. This method addresses multimedia copyright protection issues, particularly in the music industry, and can be integrated into digital recording devices like cameras and DVD players.
Another notable patent involves a semiconductor passive Q-switch that provides variable outputs. This semiconductor wafer serves as a saturable absorber for passive Q-switching in laser systems, enabling the production of laser pulses with defined output characteristics. By adjusting the position of the semiconductor saturable absorber, the loss properties of the laser cavity can be modified, allowing for variations in pulse duration, repetition rate, peak power, and average output power. The semiconductor wafer can be composed of materials such as doped or undoped GaAs, AlGaAs, and InP.
Career Highlights
Siu Chung Tam has worked with esteemed organizations, including Nanyang Technological University and Datamark Technologies Pte Ltd. His experience in these institutions has contributed to his innovative work and patent development.
Collaborations
He has collaborated with notable colleagues, including Yee Loy Lam and Yan Zhou, further enhancing his research and development efforts.
Conclusion
Siu Chung Tam's contributions to digital watermarking and laser technology demonstrate his innovative spirit and commitment to advancing these fields. His patents not only address current challenges in multimedia copyright protection but also improve the functionality of laser systems.