Patents by Inventor Panos Nasiopoulos
Panos Nasiopoulos 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: 11100888Abstract: A method of producing at least one output image signal representing, at least, a plurality of output luminance values in an output range of luminance values is disclosed. The method involves: identifying a mapping function based at least in part on a perceptually scaled distribution of a plurality of input luminance values in an input range of luminance values different from the output range of luminance values; transforming the plurality of input luminance values into respective perceptually scaled output luminance values according to the mapping function; transforming the perceptually scaled output luminance values into respective ones of the plurality of output luminance values; and producing the at least one output signal representing, at least, the plurality of output luminance values. Computer-readable media and apparatuses are also disclosed.Type: GrantFiled: June 27, 2018Date of Patent: August 24, 2021Assignee: THE UNIVERSITY OF BRITISH COLUMBIAInventors: Panos Nasiopoulos, Stylianos Ploumis, Mahsa Talebpourazad, Ronan Boitard, Pedram Mohammadi
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Publication number: 20200126509Abstract: A method of producing at least one output image signal representing, at least, a plurality of output luminance values in an output range of luminance values is disclosed. The method involves: identifying a mapping function based at least in part on a perceptually scaled distribution of a plurality of input luminance values in an input range of luminance values different from the output range of luminance values; transforming the plurality of input luminance values into respective perceptually scaled output luminance values according to the mapping function; transforming the perceptually scaled output luminance values into respective ones of the plurality of output luminance values; and producing the at least one output signal representing, at least, the plurality of output luminance values. Computer-readable media and apparatuses are also disclosed.Type: ApplicationFiled: June 27, 2018Publication date: April 23, 2020Inventors: Panos NASIOPOULOS, Stylianos PLOUMIS, Mahsa TALEBPOURAZAD, Ronan BOITARD, Pedram MOHAMMADI
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Patent number: 9769451Abstract: Image processing is performed to facilitate subtractive crosstalk cancellation in 3D images. In a global embodiment, pixel values are compressed to provide sufficient foot room for subtractive crosstalk cancellation. For video images the degree of compression may vary from frame to frame. Temporal filtering may be applied to reduce flicker. In a local embodiment luminance is added to and/or compression is performed in local areas to facilitate more complete subtractive crosstalk cancellation. The amount or added luminance or compression may be matched to the requirements of the local areas. Added luminance and/or compression may be made to vary smoothly in time and smoothly in space. Displays and other apparatus may be constructed to perform methods for partial or complete crosstalk cancellation.Type: GrantFiled: September 25, 2015Date of Patent: September 19, 2017Assignee: Dolby Laboratories Licensing CorporationInventors: Colin R. Doutre, Panos Nasiopoulos
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Publication number: 20160094828Abstract: Image processing is performed to facilitate subtractive crosstalk cancellation in 3D images. In a global embodiment, pixel values are compressed to provide sufficient foot room for subtractive crosstalk cancellation. For video images the degree of compression may vary from frame to frame. Temporal filtering may be applied to reduce flicker. In a local embodiment luminance is added to and/or compression is performed in local areas to facilitate more complete subtractive crosstalk cancellation. The amount or added luminance or compression may be matched to the requirements of the local areas. Added luminance and/or compression may be made to vary smoothly in time and smoothly in space. Displays and other apparatus may be constructed to perform methods for partial or complete crosstalk cancellation.Type: ApplicationFiled: September 25, 2015Publication date: March 31, 2016Inventors: Colin R. Doutre, Panos Nasiopoulos
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Patent number: 9148645Abstract: Image processing is performed to facilitate subtractive crosstalk cancellation in 3D images. In a global embodiment, pixel values are compressed to provide sufficient foot room for subtractive crosstalk cancellation. For video images the degree of compression may vary from frame to frame. Temporal filtering may be applied to reduce flicker. In a local embodiment luminance is added to and/or compression is performed in local areas to facilitate more complete subtractive crosstalk cancellation. The amount or added luminance or compression may be matched to the requirements of the local areas. Added luminance and/or compression may be made to vary smoothly in time and smoothly in space. Displays and other apparatus may be constructed to perform methods for partial or complete crosstalk cancellation.Type: GrantFiled: May 1, 2012Date of Patent: September 29, 2015Assignee: Dolby Laboratories Licensing CorporationInventors: Colin R. Doutre, Panos Nasiopoulos
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Patent number: 9129445Abstract: Several embodiments of an efficient tone mapping of high bit depth video to low bit depth displays are disclosed. In one embodiment, a system maps an input image data of a high dynamic range (HDR) onto output image data of a lower dynamic range (LDR) and where the mapping does not transform the input image data from one color space to another color space. One embodiment comprises a tone mapping module which outputs a tone-mapped luminance signal for output image data and a color mapping module which outputs chroma signals for the output image data. Intermediate image processing steps may be avoided and hence may increase the efficiency of the mapping.Type: GrantFiled: March 12, 2013Date of Patent: September 8, 2015Assignee: Dolby Laboratories Licensing CorporationInventors: Zicong Mai, Panos Nasiopoulos, Rabab K Ward
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Publication number: 20150030233Abstract: A system and method of determining a depth map sequence for a subject two-dimensional video sequence by: determining a plurality of monocular depth cues for each frame of the subject two-dimensional video sequence; and determining a depth map for each frame of the subject two-dimensional video sequence based on the application of the plurality of monocular depth cues determined for the frame to a depth map model. The depth map model determined by: determining a plurality of monocular depth cues for one or more training two-dimensional video sequences; and determining a depth map model based the plurality of monocular depth cues of the one or more training two-dimensional video sequences and corresponding known depth maps for each of the one or more training two-dimensional video sequences.Type: ApplicationFiled: December 12, 2011Publication date: January 29, 2015Applicant: The University of British ColumbiaInventors: Panos Nasiopoulos, Mahsa Talebpourazad, Ali Bashiashati Saghezchi
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Publication number: 20130241931Abstract: Several embodiments of an efficient tone mapping of high bit depth video to low bit depth displays are disclosed. In one embodiment, a system maps an input image data of a high dynamic range (HDR) onto output image data of a lower dynamic range (LDR) and where the mapping does not transform the input image data from one color space to another color space. One embodiment comprises a tone mapping module which outputs a tone-mapped luminance signal for output image data and a color mapping module which outputs chroma signals for the output image data. Intermediate image processing steps may be avoided and hence may increase the efficiency of the mapping.Type: ApplicationFiled: March 12, 2013Publication date: September 19, 2013Applicant: Dolby Laboratiories Licensing CorporationInventors: Zicong Mai, Panos Nasiopoulos, Rabab K. Ward
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Publication number: 20120287250Abstract: Image processing is performed to facilitate subtractive crosstalk cancellation in 3D images. In a global embodiment, pixel values are compressed to provide sufficient foot room for subtractive crosstalk cancellation. For video images the degree of compression may vary from frame to frame. Temporal filtering may be applied to reduce flicker. In a local embodiment luminance is added to and/or compression is performed in local areas to facilitate more complete subtractive crosstalk cancellation. The amount or added luminance or compression may be matched to the requirements of the local areas. Added luminance and/or compression may be made to vary smoothly in time and smoothly in space. Displays and other apparatus may be constructed to perform methods for partial or complete crosstalk cancellation.Type: ApplicationFiled: May 1, 2012Publication date: November 15, 2012Applicant: DOLBY LABORATORIES LICENSING CORPORATIONInventors: Colin R. Doutre, Panos Nasiopoulos