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1. CA2412418 - METHOD AND APPARATUS FOR SEAMLESS INTEGRATION OF MULTIPLE VIDEO PROJECTORS

Office
Canada
Application Number 2412418
Application Date 06.06.2001
Publication Number 2412418
Publication Date 07.03.2002
Grant Number
Grant Date 08.08.2006
Publication Kind C
IPC
G09G 5/12
GPHYSICS
09EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
5Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
12Synchronisation between the display unit and other units, e.g. other display units, video-disc players
G02F 1/1335
GPHYSICS
02OPTICS
FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
1Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
01for the control of the intensity, phase, polarisation or colour
13based on liquid crystals, e.g. single liquid crystal display cells
133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
1333Constructional arrangements
1335Structural association of cells with optical devices, e.g. polarisers or reflectors
G03B 21/00
GPHYSICS
03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
21Projectors or projection-type viewers; Accessories therefor
H04N 3/22
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
3Scanning details of television systems; Combination thereof with generation of supply voltages
10by means not exclusively optical-mechanical
16by deflecting electron beam in cathode-ray tube
22Circuits for controlling dimensions, shape or centering of picture on screen
H04N 3/223
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
3Scanning details of television systems; Combination thereof with generation of supply voltages
10by means not exclusively optical-mechanical
16by deflecting electron beam in cathode-ray tube
22Circuits for controlling dimensions, shape or centering of picture on screen
223Controlling dimensions
H04N 3/227
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
3Scanning details of television systems; Combination thereof with generation of supply voltages
10by means not exclusively optical-mechanical
16by deflecting electron beam in cathode-ray tube
22Circuits for controlling dimensions, shape or centering of picture on screen
227Centering
CPC
H04N 9/12
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
9Details of colour television systems
12Picture reproducers
G03B 21/005
GPHYSICS
03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
21Projectors or projection-type viewers; Accessories therefor
005Projectors using an electronic spatial light modulator but not peculiar thereto
H04N 9/3147
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
9Details of colour television systems
12Picture reproducers
31Projection devices for colour picture display ; , e.g. using electronic spatial light modulators [ESLM]
3141Constructional details thereof
3147Multi-projection systems
H04N 9/3182
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
9Details of colour television systems
12Picture reproducers
31Projection devices for colour picture display ; , e.g. using electronic spatial light modulators [ESLM]
3179Video signal processing therefor
3182Colour adjustment, e.g. white balance, shading or gamut
Applicants PANORAM TECHNOLOGIES, INC.
Inventors MAYER, THEODORE III
WANG, SU WEN
Priority Data 60/211,768 13.06.2000 US
Title
(EN) METHOD AND APPARATUS FOR SEAMLESS INTEGRATION OF MULTIPLE VIDEO PROJECTORS
(FR) PROCEDE ET APPAREIL PERMETTANT UNE INTEGRATION TRANSPARENTE DE MULTIPLES PROJECTEURS VIDEO
Abstract
(EN)
Method and apparatus are provided for seamless integration of multiple video projectors. In addition to edge blending, projection artifacts in dark or black image regions caused by residual grays from non-perfect projector black levels are reduced. Overlapped and non-overlapped areas of the image are defined and then the minimum black level of the video signal in non-overlapped areas is boosted without affecting the bright portion of the video signal in order to create uniform black level. The bright portion of the image is then smoothed in the overlapped area with seamless edge blending techniques. The resultant projected image may be passed through a neutral density filter to lower the base black level of the now uniform overlap and non-overlap black regions. The image may also pass through a physical mask which is hard edged or graded and aligned to less than the overall overlap region and that when used, smooths the edge of transition between the non-overlapped and overlapped regions.