Patents by Inventor Wen-Hsiang Tsai
Wen-Hsiang Tsai has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10110873Abstract: A backward depth mapping method for stereoscopic image synthesis includes: providing a first coordinate and a first depth value of a pixel of a virtual view in a stereoscopic image; calculating a second coordinate and a second depth value of a pixel of reference view, which is obtained by mapping the virtual view, based on the first coordinate and the first depth value of the pixel of the virtual view; calculating an error value corresponding to the first depth value based on the second coordinate and second depth value; and determining a third depth value of the pixel of the virtual view based on the error value. As a result, it is possible to avoid the virtual view producing a crack and the pixel of the background from appearing at the crack of the foreground.Type: GrantFiled: July 15, 2015Date of Patent: October 23, 2018Assignee: National Chiao Tung UniversityInventors: Yu-Lun Liu, Hsueh-Ming Hang, Wen-Hsiang Tsai
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Publication number: 20170147609Abstract: A method for analyzing and searching 3D models includes steps of obtaining data global features and data local features of data images by globally analyzing and locally analyzing data images of 3D models respectively; obtaining searching global features and searching local features by globally analyzing and locally analyzing searching images respectively; obtaining corresponding data global features and corresponding data local features based on the search global features and the searching local feature; and obtaining corresponding data images based on the corresponding data global features and the corresponding data local features.Type: ApplicationFiled: May 9, 2016Publication date: May 25, 2017Inventors: I-Chen LIN, Jun-Yang LIN, Mei-Fang SHE, Wen-Hsiang TSAI
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Publication number: 20160205375Abstract: The invention is a backward depth mapping method for stereoscopic image synthesis, which includes: providing a first coordinate and a first depth value of a pixel of a virtual view in a stereoscopic image; calculating a second coordinate and a second depth value of a pixel of reference view, which is obtained by mapping the virtual view, based on the first coordinate and the first depth value of the pixel of the virtual view; calculating an error value corresponding to the first depth value of the pixel of the virtual view based on the second coordinate and second depth value of the pixel of the reference view; determining a third depth value of the pixel of the virtual view based on the error value corresponding to the first depth value of the pixel of the virtual view. Thereby, the invention can avoid the virtual view from producing crack and the pixel of background from appearing at the crack of the foreground.Type: ApplicationFiled: July 15, 2015Publication date: July 14, 2016Inventors: Yu-Lun Liu, Hsueh-Ming Hang, Wen-Hsiang Tsai
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Patent number: 9330210Abstract: The present invention provides a sand art simulation system and method, which transfers an image into sand art. Analyze contour lines and feature points of objects in the image to find out which contour line can be drawn at the same time. Divide the image into a plurality of blocks, and analyze sand spilling ways at each block. Simulate sand floating in the air, moving and heaping to make a sand-spread plane. Then draw the contour lines on the sand-spread plane to show the sand art of the image.Type: GrantFiled: March 31, 2014Date of Patent: May 3, 2016Assignee: National Chiao Tung UniversityInventors: Peng-Yu Chen, Sai-Keung Wong, Wen-Hsiang Tsai
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Patent number: 9313021Abstract: A secret communication method with a self-authentication capability is provided, which comprises steps of dividing a secret message into a plurality of secret segments; converting each of the secret segments into (k+1) shares, wherein k is a positive integer; embedding the shares into a media carrier; selecting every k shares among the (k+1) ones to compute (k+1) copies in value; and checking if the (k+1) copies in value are the same. If the (k+1) copies in value are the same, then the secret message is shown. Otherwise, at least one mark will be utilized to replace the secret message while the part of the secret message which is not falsified can still be correctly shown. By employing the method, the integrity and fidelity of the hidden secret message can thus be verified, thereby achieving a new covert communication process performing both information hiding and self-authentication capability.Type: GrantFiled: August 29, 2013Date of Patent: April 12, 2016Assignee: National Chiao Tung UniversityInventors: Che-Wei Lee, Wen-Hsiang Tsai
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Publication number: 20150326750Abstract: The present invention provides a data hiding method via revision records on a collaboration platform, which first creates a collaborative database including a plurality of articles and revision records. A user puts as input a cover document, a secret message, and a key on a collaboration platform. Based on four characteristics of multi-user collaborative-writing processing, the collaborative-writing platform is used, together with a key, to hide a secret message into the cover document automatically while simulating a collaborative-writing process and generate a stego-document where the secret message is hidden. Only authorized users with the key can extract the right secret message from the stego-document i.e. the message-hidden document successfully.Type: ApplicationFiled: October 23, 2014Publication date: November 12, 2015Inventors: Ya-Lin LEE, Wen-Hsiang TSAI
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Publication number: 20150193952Abstract: The present invention provides a sand art simulation system and method, which transfers an image into sand art. Analyze contour lines and feature points of objects in the image to find out which contour line can be drawn at the same time. Divide the image into a plurality of blocks, and analyze sand spilling ways at each block. Simulate sand floating in the air, moving and heaping to make a sand-spread plane. Then draw the contour lines on the sand-spread plane to show the sand art of the image.Type: ApplicationFiled: March 31, 2014Publication date: July 9, 2015Applicant: NATIONAL CHIAO TUNG UNIVERSITYInventors: Peng-Yu CHEN, Sai-Keung WONG, Wen-Hsiang TSAI
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Patent number: 9071752Abstract: A scene imaging method using a portable two-camera omni-imaging device for human-reachable environments is disclosed. Firstly, an upper omni-image and a lower omni-image of at least one scene are captured. Next, image inpainting and image dehazing perform on the upper omni-image and the lower omni-image. Next, image unwrapping performs on the upper omni-image and the lower omni-image by a pano-mapping table, so as to form an upper panoramic image and a lower panoramic image respectively, and the upper panoramic image and the lower panoramic image respectively have an upper part and a lower part overlapping each other. Finally, a data item on the upper part and the lower part is obtained by view points of the scene and the pano-mapping table, thereby stitching the upper and lower panoramic images.Type: GrantFiled: September 25, 2012Date of Patent: June 30, 2015Assignee: National Chiao Tung UniversityInventors: Yu-Tung Kuo, Wen-Hsiang Tsai
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Publication number: 20150067870Abstract: A secret communication method with a self-authentication capability is provided, which comprises steps of dividing a secret message into a plurality of secret segments; converting each of the secret segments into (k+1) shares, wherein k is a positive integer; embedding the shares into a media carrier; selecting every k shares among the (k+1) ones to compute (k+1) copies in value; and checking if the (k+1) copies in value are the same. If the (k+1) copies in value are the same, then the secret message is shown. Otherwise, at least one mark will be utilized to replace the secret message while the part of the secret message which is not falsified can still be correctly shown. By employing the method, the integrity and fidelity of the hidden secret message can thus be verified, thereby achieving a new covert communication process performing both information hiding and self-authentication capability.Type: ApplicationFiled: August 29, 2013Publication date: March 5, 2015Applicant: NATIONAL CHIAO TUNG UNIVERSITYInventors: CHE-WEI LEE, WEN-HSIANG TSAI
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Patent number: 8949610Abstract: A method for embedding a secret message into a PNG image comprises steps: converting a secret message into a plurality of secret codes; converting the secret codes into a plurality of secret shares; using a mapping process to modify values of the secret shares to approach a full-transparent value of an alpha channel of a PNG image, and sequentially embedding the mapped secret shares into the alpha channel. As the secret shares with high-transparent values, they leave the RGB channels untouched. Thus, embedding the secret shares into the PNG image does not make difference in the appearances between the secret-carrying image and the original PNG image. Therefore, the present invention can transmit secret message securely and realize covert communication.Type: GrantFiled: February 23, 2011Date of Patent: February 3, 2015Assignee: National Chiao Tung UniversityInventors: Che Wei Lee, Wen-Hsiang Tsai
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Publication number: 20140085408Abstract: A scene imaging method using a portable two-camera omni-imaging device for human-reachable environments is disclosed. Firstly, an upper omni-image and a lower omni-image of at least one scene are captured. Next, image inpainting and image dehazing perform on the upper omni-image and the lower omni-image. Next, image unwrapping performs on the upper omni-image and the lower omni-image by a pano-mapping table, so as to form an upper panoramic image and a lower panoramic image respectively, and the upper panoramic image and the lower panoramic image respectively have an upper part and a lower part overlapping each other. Finally, a data item on the upper part and the lower part is obtained by view points of the scene and the pano-mapping table, thereby stitching the upper and lower panoramic images.Type: ApplicationFiled: September 25, 2012Publication date: March 27, 2014Applicant: NATIONAL CHIAO TUNG UNIVERSITYInventors: Yu-Tung KUO, Wen-Hsiang TSAI
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Patent number: 8116928Abstract: The present invention discloses an automatic ultrasonic and computer-vision navigation device and a method using the same. In the method of the present invention, the user guides an automatic navigation device to learn and plan a navigation path; next, the automatic navigation device navigates independently and uses ultrasonic signals and computer vision to detect the environment; then, the automatic navigation device compares the detected environment data with the navigation path to amend the physical movement track. The present invention enables ordinary persons to interact with the automatic navigation device without operating the computer. As the present invention adopts computer vision and ultrasonic signals to realize the functions thereof, the manufacturers can save the hardware cost.Type: GrantFiled: February 4, 2009Date of Patent: February 14, 2012Assignee: National Chiao Tung UniversityInventors: Chih-Jen Wu, Shung-Yung Tsai, Wen-Hsiang Tsai
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Publication number: 20110249813Abstract: A method for embedding a secret message into a PNG image comprises steps: converting a secret message into a plurality of secret codes; converting the secret codes into a plurality of secret shares; using a mapping process to modify values of the secret shares to approach a full-transparent value of an alpha channel of a PNG image, and sequentially embedding the mapped secret shares into the alpha channel. As the secret shares with high-transparent values, they leave the RGB channels untouched. Thus, embedding the secret shares into the PNG image does not make difference in the appearances between the secret-carrying image and the original PNG image. Therefore, the present invention can transmit secret message securely and realize covert communication.Type: ApplicationFiled: February 23, 2011Publication date: October 13, 2011Applicant: NATIONAL CHIAO TUNG UNIVERSITYInventors: CHE WEI LEE, WEN-HSIANG TSAI
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Patent number: 7831060Abstract: A method for protecting content of vector graphics formats is provided. A first vector graphics is scrambled to generate a second vector graphics. Then a plurality of pixel samplings are performed by the first vector graphics which generating at least a recovery information object according to a predetermined graphics. The predetermined graphics is watermarked to generate a watermark object. And the recovery information object is encoded and embedded in the watermark object to generate a recovery information watermark. Finally, the second vector graphics, the recovery information watermark, and the recovery code are combined to generate a protected first vector graphics.Type: GrantFiled: August 3, 2006Date of Patent: November 9, 2010Assignee: Institute for Information IndustryInventors: Yueh-Cheng Chuang, Wen-Hsiang Tsai, Yu-Chen Tsai
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Publication number: 20100042319Abstract: The present invention discloses an automatic ultrasonic and computer-vision navigation device and a method using the same. In the method of the present invention, the user guides an automatic navigation device to learn and plan a navigation path; next, the automatic navigation device navigates independently and uses ultrasonic signals and computer vision to detect the environment; then, the automatic navigation device compares the detected environment data with the navigation path to amend the physical movement track. The present invention enables ordinary persons to interact with the automatic navigation device without operating the computer. As the present invention adopts computer vision and ultrasonic signals to realize the functions thereof, the manufacturers can save the hardware cost.Type: ApplicationFiled: February 4, 2009Publication date: February 18, 2010Inventors: Chih-Jen WU, Shung-Yung TSAI, Wen-Hsiang TSAI
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Publication number: 20080192670Abstract: A repeater device includes a wireless network receiver device having a low power multi-frequency WLAN telecommunication protocol module for communicating with end users, and a high power multi-frequency WLAN telecommunication protocol module for communicating with wireless networks, a control device includes two servo devices coupled to the low power and the high power multi-frequency WLAN telecommunication protocol modules for controlling the signals of the low power and the high power multi-frequency WLAN telecommunication protocol modules. The control device includes a signal treating device coupled to the servo devices for communicating signals between the servo devices, and a signal regulating device for regulating a transmission power required for the servo devices.Type: ApplicationFiled: November 9, 2005Publication date: August 14, 2008Inventors: Justine Yen, Wen Hsiang Tsai
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Publication number: 20070147655Abstract: A method for protecting content of vector graphics formats is provided. A first vector graphics is scrambled to generate a second vector graphics. Then a plurality of pixel samplings are performed by the first vector graphics which generating at least a recovery information object according to a predetermined graphics. The predetermined graphics is watermarked to generate a watermark object. And the recovery information object is encoded and embedded in the watermark object to generate a recovery information watermark. Finally, the second vector graphics, the recovery information watermark, and the recovery code are combined to generate a protected first vector graphics.Type: ApplicationFiled: August 3, 2006Publication date: June 28, 2007Inventors: Yueh-Cheng Chuang, Wen-Hsiang Tsai, Yu-Chen Tsai
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Patent number: 6378618Abstract: A control switch for a fire extinguisher in the present invention has a spring placed between a handle and an operating lever and pivoted by a pivot axle; a change-over switch pivoted within a through hole formed in the operating lever, by which the change-over switch can be changed over in an ON position and become vertical so that a press-in valve stem can be pressed by a bottom of the change-over switch to open a valve seat to inject a fire-extinguishing agent for extinguishing fire when the operating lever is pressed downward; the change-over switch can be changed over in an OFF position and become slanted so that the press-in valve stem can not be pressed and actuated by the bottom of the change-over switch even if the operating lever is pressed downward, thereby achieving an effect of safety control to the fire extinguisher and being convenient in operation.Type: GrantFiled: September 18, 2001Date of Patent: April 30, 2002Inventors: Chen-Hsin Yang, Wen-Hsiang Tsai
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Patent number: 5274744Abstract: In accordance with the present invention, a neural network comprising an array of neurons (i.e. processing nodes) interconnected by synapses (i.e. weighted transmission links) is utilized to carry out a probabilistic relaxation process. The inventive neural network is especially suited for carrying out a variety of image processing tasks such as thresholding.Type: GrantFiled: January 21, 1992Date of Patent: December 28, 1993Assignee: Industrial Technology Research InstituteInventors: Shiaw-Shian Yu, Wen-Hsiang Tsai
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Patent number: D488589Type: GrantFiled: January 4, 2002Date of Patent: April 13, 2004Inventors: Chen-Hsing Yang, Wen-Hsiang Tsai