Alpha Lan-Chung Hou

6459506, Oct 1, 2002

Nov 2, 2000

09/705522

Darwin Hu - San Jose CA
Alpha Hou - San Jose CA

Syscan, Inc. - San Jose CA

H04N 1024

358473, 358475

A portable dual-mode scanner device capable of being powered through a universal serial bus connection where the individual components of the portable scanner are selectively and controllably powered so as to function within the power limitations of the usb port (i. e. , 5 Volts, 2. 2 watts) without appreciable degradation of a captured image whether that image resides on a transparent media (i. e. , a negative) or an opaque media (i. e. , paper) is described.

6546152, Apr 8, 2003

May 4, 2000

09/565206

Alpha Hou - San Jose CA

Syscan Technology (Shenzhen) Co. Limited - Shenzhen

G06K 936

382284, 382294, 382254, 382312

A method and apparatus for providing images in 2-D scanners are disclosed. According to one aspect of the system, a series of images are successively generated from a sensing module in a scanner as the scanner is moving across a scanning document. A first image is initially kept in a memory. When a second image becomes available, an overlapping between the first image and the second image is located. From the overlapping, it is to determine if the stored first image is precisely registered with the second image. If the two images are registered, a signal-to-noise enhanced image is obtained by averaging the two images. If the two images are not registered, a combined image is obtained by combining the two images. Either the signal-to-noise enhanced image or the combined image is then stored in the memory to work with the next image. The process is repeated till all the images are processed.

6587145, Jul 1, 2003

Aug 20, 1998

09/137364

Alpha Hou - San Jose CA

Syscan Technology (Shenzhen) Co., Ltd. - Guangdong

H04N 314

348297, 3482301, 2502081

The purpose of the present invention is to provide a generic solution for direct readout of the charge signals from the photodetectors in an image sensor to minimize possible signal distortions. The disclosed image sensor uses a time measurement circuit for each of the photodetectors. The time elapsed for each of the photodetectors to reach a reference signal is measured and converted to a digital representation that is subsequently readout as the digital signals.

6596979, Jul 22, 2003

Dec 21, 2001

10/028812

Alpha Hou - San Jose CA

Syscan Technology (Shenzhen) Co., Limited - Shenzhen
Syscan, Inc. - San Jose CA

H01J 4014

2502081, 250234, 250226, 358443

An image sensor employing multiple arrays of photodetectors is disclosed. According to one aspect of the present invention, every two of three arrays are shielded with a non-transparent material. When charge signals are generated in the non-shielded array in response to light reflected from a scanning document illuminated by one of three colored lights, the charge signals are shifted to a next adjacent shielded array so that another set of charge signals can be generated under another one of the three colored lights. Essentially, the shielded arrays are used as buffers to separate the charge signals independently generated under three different colored lights. Subsequently, the charge signals corresponding to the same colored light can be accumulated to produce a much stronger scanning signal.

6603108, Aug 5, 2003

Apr 9, 2001

09/829259

Alpha Hou - San Jose CA
Chengwu Gu - Guang Dong, CN

Syscan Technology (Shenzhen) Co. Limited - Guang Dong

H01L 2700

2502081, 250235, 358473

Distinct designs are provided to reduce dimensions of an image sensing module without affecting the sizes of the original individual components in the image sensing module. According to one embodiment, a mirror is mounted before an optical focus system and used to collect and redirect reflected light from a scanning object being illuminated by an illumination source in the image sensing module, wherein the scanning object is parallel to the optical focus system.

6646682, Nov 11, 2003

Dec 18, 1998

09/216279

Alpha Hou - San Jose CA

Syscan (Shenzhen) Technology Co., Limited - Guangdong
Syscan, Inc. - San Jose CA

H04N 314

348280, 348324

An improved color image linear sensor is disclosed to minimize the registration problems commonly seen in a sensor using three rows of photodetectors. In particular, according to one embodiment, the photodetectors in the improved color image linear sensor are shaped in triangle so that the triangular-like shaped photodetectors are interspersed with the upside-down triangular-like shaped photodetectors.

6704124, Mar 9, 2004

Jun 12, 2001

09/880357

Darwin Hu - San Jose CA
Alpha Hou - San Jose CA
Dongtai Liu - Fremont CA
Chengrong Lu - San Jose CA

Syscan (Shenzhen) Technology Co., Limited - Guangdong
Syscan, Inc. - San Jose CA

H04N 2024

358473, 382313

It is disclosed that a mobile scanner includes only the minimum components to operate as a scanner. The disclosed scanner does not have a separate power supply to energize the components to work. Further, unlike many scanners in the market, there is not a single microcontroller in the disclosed mobile scanner while the performance thereof could outperform those scanners commanded traditionally by a microcontroller in the scanners. The disclosed scanner is coupled by an interface engine to a computing device that provides system control signals and power supply. The interface engine comprises a control circuit providing logic control signals to the scanner to operate in response to the system control signals. As such, the scanner is of high performance and low cost and so lightweight that it can be used in any conditions.

6836361, Dec 28, 2004

Sep 4, 2003

10/653980

Alpha Hou - San Jose CA, 95129

G03B 2126

359443, 353 29

A front projection screen for a video projection system is provided. The front projection screen includes a reflection screen surface, and a reflection material on the reflection screen surface, wherein the reflection material consists of a plurality of red, green, and blue color reflecting cells for receiving projected lights, absorbing a part of the projected lights having spectrums beyond ranges of red, green, and blue color spectrums, and reflecting a part of the projected lights having spectrums within ranges of red, green, and blue color spectrums back.