Patents by Inventor Wai Ming Tsang
Wai Ming Tsang 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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Publication number: 20150277377Abstract: Fast processing of information represented in digital holograms is provided to facilitate converting a complex Fresnel hologram into a phase-only hologram, which can be a localized error diffusion and redistribution (LERDR) hologram, for displaying 3-D holographic images representative of a 3-D object scene. For a complex Fresnel hologram representing a 3-D object scene, a holographic generator component (HGC) can directly apply an LERDR process to the complex hologram to facilitate converting the complex hologram into an LERDR hologram. As part of the LERDR process, the HGC can partition the complex hologram into segments, convert the complex values of the pixels in each segment to phase-only values, and apply error diffusion to each segment to facilitate generating the phase-only hologram. The HGC can apply error redistribution to the last pixel of each segment to produce the resulting LERDR hologram, which can be displayed on a phase-only display device.Type: ApplicationFiled: June 16, 2014Publication date: October 1, 2015Inventor: Peter Wai Ming Tsang
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Publication number: 20150245156Abstract: Neural induced enhancement of audio signals is provided to facilitate improving the listening pleasure of a user. An audio processor component can detect brain waves of a user at different frequency bands, analyze the brain wave signal in each of the different frequency bands, and can adjust one or more audio enhancement effects based at least in part on the results of the analysis. The audio processor component can adjust a spatial effect of audio signals, integrate a periodic or random variation on a spatial widening effect of audio signals, adjust a spatial effect of delayed audio signals, integrate a periodic or random variation on a spatial widening effect of the delayed audio signals, or adjust another audio enhancement effect(s) based at least in part on the analysis results, comprising information relating to the respective strengths of the one or more different frequency bands of the brain waves.Type: ApplicationFiled: February 21, 2014Publication date: August 27, 2015Applicant: City University of Hong KongInventor: Peter Wai Ming Tsang
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Patent number: 9041771Abstract: Systems, methods, and devices that control switching of a multi-mode barrier component for efficiently displaying various types of 2-D content and 3-D content are presented. A barrier control component detects an optical signal in a control region of a display screen that is providing visual content to the barrier component, and identifies the type of visual content, such as 2-D content, 3-D stereoscopic content, or 3-D autostereoscopic content, based at least in part on the optical signal. The barrier control component identifies a specified control signal based at least in part on the identified content type, and transmits the specified control signal to the barrier component via a wireline or wireless connection. The barrier component is controlled to automatically switch to a specified mode, such as 2-D mode, 3-D stereoscopic mode, or 3-D autostereoscopic mode, and employ a specified barrier pattern, in response to the received specified control signal.Type: GrantFiled: June 8, 2011Date of Patent: May 26, 2015Assignee: CITY UNIVERSITY OF HONG KONGInventor: Peter Wai Ming Tsang
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Publication number: 20150131133Abstract: Fast processing of information represented in digital holograms is provided to facilitate generating a phase-only hologram for displaying 3-D holographic images representative of a 3-D object scene on a display device. A holographic generator component (HGC) can receive or generate visual images, comprising depth and parallax information, of a 3-D object scene. A hologram processor component can downsample an intensity image of a visual image of the 3-D object scene using a uniform or random lattice to facilitate converting the intensity image to a sparse image. The hologram processor component can generate a complex 3-D Fresnel hologram, comprising the depth and parallax information, based on the sparse image using a fast hologram generation algorithm. The hologram processor component modify the magnitude of the pixels of the complex hologram to a defined homogeneous value to facilitate converting the complex hologram to a phase-only hologram.Type: ApplicationFiled: November 11, 2013Publication date: May 14, 2015Applicant: City University of Hong KongInventor: Peter Wai Ming Tsang
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Patent number: 8994786Abstract: Systems, methods, and devices that generate and display a multiple view 3-D holographic image (“image”) of a 3-D real or synthetic scene are presented. A projection system captures visual information of the 3-D scene from various perspectives and generates model data to create a 3-D model of the scene. The model data is converted to holographic data, which is respectively portioned corresponding to the respective perspectives of the scene and used to generate and display respective portions of the image on respective display sections. The display sections can be separate display sections corresponding to the various perspectives, or the display sections can be on a single display that is divided into sections for the various perspectives and a 3-D adapter is employed to facilitate display of the image in the display area, wherein reflector components can be used to reflect the portions of the image to the display area.Type: GrantFiled: April 8, 2010Date of Patent: March 31, 2015Assignee: City University of Hong KongInventors: Peter Wai Ming Tsang, Wu Chao Situ, Kayton Wai Keung Cheung
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Publication number: 20150077818Abstract: Fast processing of information represented in digital holograms is provided to facilitate converting a complex Fresnel hologram into a single phase-only hologram, which can be called a bidirectional error diffusion (BERD) hologram, for displaying 3-D holographic images representative of a 3-D object scene on a display device. The BERD hologram can be capable of representing a 3-D object scene and preserving favorable visual quality on the reconstructed holographic image. A holographic generator component (HGC) can receive or generate a complex Fresnel hologram representing a 3-D object scene. The HGC can directly apply the BERD process to the complex Fresnel hologram to facilitate converting the complex Fresnel hologram into a phase-only hologram. Alternatively, the HGC can directly apply a unidirectional error diffusion process to the complex Fresnel hologram to facilitate converting the complex Fresnel hologram into a phase-only hologram.Type: ApplicationFiled: September 17, 2013Publication date: March 19, 2015Applicant: City University of Hong KongInventor: Peter Wai Ming Tsang
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Patent number: 8890931Abstract: Systems, methods, and devices that generate and display a holographic image(s) of a 3-D real or synthetic object scene are presented. A holographic generator component (HGC) partitions a 3-D object scene into a horizontal stack of regularly spaced vertical sub-planes that are each contributed to a respective sub-line. The HGC converts the sequence of sub-lines into a collection of diffraction patterns, which are summed up and interfered with a reference beam to generate the complete hologram, which can be or can approximate a Fresnel hologram. A multi-rate filter is employed to facilitate converting sub-lines to diffraction patterns more quickly. The multi-rate filtering can be realized using convolution in the spatial domain, realized in the frequency domain using a fast Fourier transform, and/or realized in the frequency domain using a graphic processing unit.Type: GrantFiled: July 18, 2011Date of Patent: November 18, 2014Assignee: City University of Hong KongInventors: Peter Wai Ming Tsang, Kayton Wai Keung Cheung
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Patent number: 8873120Abstract: A numerical method of recording a two or three dimensional object scene in a binary hologram. When the binary hologram is illuminated with a reference beam, the original object scene can be reconstructed and observed by a viewer. As the hologram is binary, i.e. composed of black or white pixels, it can be printed with commodity printers. The process is simple, fast, and economical, hence decreasing the cost and time for hologram design and production. In addition, with binary holograms, the ability to store the holograms is enhanced and binary holograms facilitate efficient transmission of the holograms.Type: GrantFiled: August 13, 2013Date of Patent: October 28, 2014Assignee: City University of Hong KongInventors: Wai Ming Tsang, Wai Keung Cheung
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Patent number: 8854424Abstract: Systems, methods, and devices that generate and display a multiple view 3-D holographic image (“image”) of a 3-D real or synthetic scene are presented. A capture system can capture or generate as little as a single 2-D image, or a sequence of 2-D images, of a scene and can convert the 2-D visual information to facilitate generating a 3-D scene from various perspectives. Predefined distortion morphing or transition morphing is employed to generate one or more morphing images to reconstruct different perspectives of the scene without having to capture such different perspectives. A sequence of 2-D images, including the morphing images, each representing a respective view of the scene are integrated to form a 3-D integrated image, which can be displayed on a 3-D aerial projection system. The disclosed subject matter can generate and/or maintain disparity information to improve quality of the display of the 3-D integrated image.Type: GrantFiled: June 8, 2011Date of Patent: October 7, 2014Assignee: City University of Hong KongInventor: Peter Wai Ming Tsang
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Publication number: 20140210942Abstract: Techniques for fast processing of information represented in digital holograms to facilitate generating and displaying 3-D holographic images representative of a 3-D object scene are presented. A holographic generator component (HGC) can receive or generate information representing a 3-D object scene. In real or near real time, the HGC can back-project a hologram to a virtual 2-D image known as a virtual diffraction plane (VDP); process the VDP to enhance optical properties of the VDP to facilitate enhancing or adjusting the optical properties of the 3-D holographic images when displayed by a display component; and expand the VDP to facilitate generating 3-D holographic images that can represent or recreate the 3-D object scene. The HGC can thereby process digital 3-D holograms of moderate size and display 3-D holographic images generated from the processed 3-D holograms at a desirably fast video rate.Type: ApplicationFiled: October 23, 2013Publication date: July 31, 2014Applicant: City University of Hong KongInventor: Peter Wai Ming Tsang
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Publication number: 20140132201Abstract: Techniques for charging electronic devices are presented. A charger controller component controls supplying power to an electronic device having a solar cell component using optical charging. The charger controller component detects a shape and position of the electronic device located on a charger substrate component. The charger controller component identifies a subset of a plurality of light sources associated with the charger substrate component that correspond to the shape and position of the electronic device, and controls illumination of the light sources to illuminate the subset of light sources. The illumination of the subset of light sources provides optical waves to the electronic device that are converted to electrical energy to charge a power component of the electronic device. An optical processing element can employ an array of lenticular lens or microlens that can expand coverage of each light source and enhance uniformity of the illuminated area.Type: ApplicationFiled: November 9, 2012Publication date: May 15, 2014Applicant: CITY UNIVERSITY OF HONG KONGInventor: Wai Ming Tsang
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Publication number: 20140092259Abstract: Techniques for presenting content provided by a mobile device on a second communication device are presented. A content enhancer component (CEC) connects via a wired or wireless communication connection to the second communication device to communicate content to the second communication device, which has a larger display than or superior audio to the mobile device. The CEC captures content and interaction between the user and mobile device in a capture region of the CEC. The CEC reconstructs the content and the user-related interaction for presentation on the second communication device. The second communication device can have a 2-D or 3-D display. If a 3-D display, the CEC can convert captured video content into a 3-D format to provide 3-D perception when content is displayed on the second communication device. The captured audio signal can be processed to provide an enhanced stereo or 3-D sound effect.Type: ApplicationFiled: September 28, 2012Publication date: April 3, 2014Applicant: CITY UNIVERSITY OF HONG KONGInventor: Wai Ming Tsang
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Publication number: 20140065520Abstract: Techniques for generating 3-D holographic images of a 3-D real or synthetic object scene are presented. A holographic generator component (HGC) can obtain a real or synthetic 3-D object scene. The HGC generates a high-resolution grating, and generates a low-resolution mask based on the 3-D object scene. The HGC overlays the mask on the grating to generate the hologram, which can be a digital mask programmable hologram. The HGC can use the grating as an encryption key, if desired, wherein the mask can be encrypted based on the encryption key. The display component receives the hologram and can generate holographic images, based on the hologram, and display the holographic images using one or more low-resolution displays. The grating and display can be arranged in various formations in relation to each other. A single display can be partitioned into a tile structure for displaying holographic images in the respective tiles.Type: ApplicationFiled: September 5, 2012Publication date: March 6, 2014Applicant: CITY UNIVERSITY OF HONG KONGInventor: Wai Ming Tsang
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Publication number: 20130329269Abstract: A numerical method of recording a two or three dimensional object scene in a binary hologram. When the binary hologram is illuminated with a reference beam, the original object scene can be reconstructed and observed by a viewer. As the hologram is binary, i.e. composed of black or white pixels, it can be printed with commodity printers. The process is simple, fast, and economical, hence decreasing the cost and time for hologram design and production. In addition, with binary holograms, the ability to store the holograms is enhanced and binary holograms facilitate efficient transmission of the holograms.Type: ApplicationFiled: August 13, 2013Publication date: December 12, 2013Applicant: CITY UNIVERSITY OF HONG KONGInventors: Wai Ming Tsang, Wai Keung Cheung
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Publication number: 20130113795Abstract: From only a single two-dimensional source image (20) of a scene, multiple images (28) of the scene are generated, each image from a different viewing direction or angle. For each of the multiple images, a disparity (24) is generated corresponding to the viewing direction and combined with significant pixels (e.g., edge detected pixels) in the source image. The disparity may be filtered (26) (e.g., low-pass filtered) prior to combining with the significant pixels. The multiple images are combined (64) into an integrated image (62) for display, for example, on an autostereoscopic monitor (10). The process can be repeated for multiple related source images to create a video sequence.Type: ApplicationFiled: July 26, 2010Publication date: May 9, 2013Applicant: City University of Hong KongInventor: Peter Wai Ming Tsang
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Publication number: 20120314024Abstract: Systems, methods, and devices that control switching of a multi-mode barrier component for efficiently displaying various types of 2-D content and 3-D content are presented. A barrier control component detects an optical signal in a control region of a display screen that is providing visual content to the barrier component, and identifies the type of visual content, such as 2-D content, 3-D stereoscopic content, or 3-D autostereoscopic content, based at least in part on the optical signal. The barrier control component identifies a specified control signal based at least in part on the identified content type, and transmits the specified control signal to the barrier component via a wireline or wireless connection. The barrier component is controlled to automatically switch to a specified mode, such as 2-D mode, 3-D stereoscopic mode, or 3-D autostereoscopic mode, and employ a specified barrier pattern, in response to the received specified control signal.Type: ApplicationFiled: June 8, 2011Publication date: December 13, 2012Applicant: CITY UNIVERSITY OF HONG KONGInventor: Peter Wai Ming Tsang
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Publication number: 20120314021Abstract: Systems, methods, and devices that generate and display a multiple view 3-D holographic image (“image”) of a 3-D real or synthetic scene are presented. A capture system can capture or generate as little as a single 2-D image, or a sequence of 2-D images, of a scene and can convert the 2-D visual information to facilitate generating a 3-D scene from various perspectives. Predefined distortion morphing or transition morphing is employed to generate one or more morphing images to reconstruct different perspectives of the scene without having to capture such different perspectives. A sequence of 2-D images, including the morphing images, each representing a respective view of the scene are integrated to form a 3-D integrated image, which can be displayed on a 3-D aerial projection system. The disclosed subject matter can generate and/or maintain disparity information to improve quality of the display of the 3-D integrated image.Type: ApplicationFiled: June 8, 2011Publication date: December 13, 2012Applicant: CITY UNIVERSITY OF HONG KONGInventor: Peter Wai Ming Tsang
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Patent number: 8175398Abstract: A method of encoding video signals into a single video signal includes extracting background images from corresponding video signals, encoding the video signals into a single video signal, the single video signal containing information for reconstructing the video signals, and replacing frames of the single video signal with the background images.Type: GrantFiled: November 10, 2008Date of Patent: May 8, 2012Assignee: City University of Hong KongInventor: Peter Wai Ming Tsang
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Publication number: 20120050460Abstract: Systems, methods, and devices that generate and display a holographic image(s) of a 3-D real or synthetic object scene are presented. A holographic generator component (HGC) partitions a 3-D object scene into a horizontal stack of regularly spaced vertical sub-planes that are each contributed to a respective sub-line. The HGC converts the sequence of sub-lines into a collection of diffraction patterns, which are summed up and interfered with a reference beam to generate the complete hologram, which can be or can approximate a Fresnel hologram. A multi-rate filter is employed to facilitate converting sub-lines to diffraction patterns more quickly. The multi-rate filtering can be realized using convolution in the spatial domain, realized in the frequency domain using a fast Fourier transform, and/or realized in the frequency domain using a graphic processing unit.Type: ApplicationFiled: July 18, 2011Publication date: March 1, 2012Applicant: CITY UNIVERSITY OF HONG KONGInventors: Peter Wai Ming Tsang, Kayton Wai Keung Cheung
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Publication number: 20110249087Abstract: Systems, methods, and devices that generate and display a multiple view 3-D holographic image (“image”) of a 3-D real or synthetic scene are presented. A projection system captures visual information of the 3-D scene from various perspectives and generates model data to create a 3-D model of the scene. The model data is converted to holographic data, which is respectively portioned corresponding to the respective perspectives of the scene and used to generate and display respective portions of the image on respective display sections. The display sections can be separate display sections corresponding to the various perspectives, or the display sections can be on a single display that is divided into sections for the various perspectives and a 3-D adapter is employed to facilitate display of the image in the display area, wherein reflector components can be used to reflect the portions of the image to the display area.Type: ApplicationFiled: April 8, 2010Publication date: October 13, 2011Applicant: CITY UNIVERSITY OF HONG KONGInventors: Peter Wai Ming Tsang, Wu Chao Situ, Kayton Wai Keung Cheung