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1. WO2007044842 - AUTOMATIC WHITE POINT ADJUSTMENT DURING VIDEO DISPLAY

Publication Number WO/2007/044842
Publication Date 19.04.2007
International Application No. PCT/US2006/039832
International Filing Date 11.10.2006
IPC
H04N 5/57 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
5Details of television systems
44Receiver circuitry
57Control of contrast or brightness
H04N 5/58 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
5Details of television systems
44Receiver circuitry
57Control of contrast or brightness
58in dependence upon ambient light
H04N 17/00 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
17Diagnosis, testing or measuring for television systems or their details
H04N 17/02 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
17Diagnosis, testing or measuring for television systems or their details
02for colour television signals
CPC
G09G 2320/0242
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2320Control of display operating conditions
02Improving the quality of display appearance
0242Compensation of deficiencies in the appearance of colours
G09G 2360/144
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2360Aspects of the architecture of display systems
14Detecting light within display terminals, e.g. using a single or a plurality of photosensors
144the light being ambient light
H04N 21/42202
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
21Selective content distribution, e.g. interactive television or video on demand [VOD]
40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
41Structure of client; Structure of client peripherals
422Input-only peripherals ; , i.e. input devices connected to specially adapted client devices; , e.g. global positioning system [GPS]
42202environmental sensors, e.g. for detecting temperature, luminosity, pressure, earthquakes
H04N 21/4318
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
21Selective content distribution, e.g. interactive television or video on demand [VOD]
40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
43Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
431Generation of visual interfaces ; for content selection or interaction; Content or additional data rendering
4318by altering the content in the rendering process, e.g. blanking, blurring or masking an image region
H04N 5/58
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
5Details of television systems
44Receiver circuitry ; for the reception of television signals according to analogue transmission standards;
57Control of contrast or brightness
58in dependence upon ambient light
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
  • TEXAS INSTRUMENTS INCORPORATED [US]/[US] (AllExceptUS)
  • RAMANATH, Rajeev [IN]/[US] (UsOnly)
  • PETTITT, Gregory, S. [US]/[US] (UsOnly)
Inventors
  • RAMANATH, Rajeev
  • PETTITT, Gregory, S.
Agents
  • FRANZ, Warren, L.
Priority Data
11/247,87811.10.2005US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) AUTOMATIC WHITE POINT ADJUSTMENT DURING VIDEO DISPLAY
(FR) RÉGLAGE AUTOMATIQUE DU POINT BLANC D’UN AFFICHAGE VIDÉO
Abstract
(EN)
The disclosure relates to systems and processes for automatically adjusting the white point of displayed images to account for changes in ambient light. In one embodiment, a display system (10) includes a display device (12) having sensors (16, 22) for recording the red (R), green (G) and blue (B) values for ambient light and measuring the intensity of such light. The sensors feed these values into a processor, which calculates R, G, B gain values to be applied to the video input R, G, B values. In this manner, the display device can account for changes in ambient light to adjust the perceived white point accordingly. Related methods for automatically adjusting the white point of a perceived image are also described.
(FR)
La présente invention concerne des systèmes et procédés destinés à un réglage automatique du point blanc des images affichées pour prendre en compte des variations de la lumière ambiante. Dans un mode de réalisation de l’invention, un système d’affichage (10) comprend un dispositif d’affichage (12) muni de capteurs (16, 22) qui enregistrent les valeurs rouge (R), verte (G) et bleue (B) de la lumière ambiante et mesurent l’intensité d’une telle lumière. Les capteurs transmettent ces valeurs à un processeur, qui calcule les valeurs de gain R, G, B à appliquer aux valeurs R, G, B d’entrée vidéo. Le dispositif d’affichage peut ainsi prendre en compte des variations de la lumière ambiante pour régler le point blanc en conséquence. La présente invention concerne également des procédés connexes permettant un réglage automatique du point blanc de l’image perçue.
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