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Display System Calibration and Characterization Device

IP.com Disclosure Number: IPCOM000214899D
Publication Date: 2012-Feb-10
Document File: 8 page(s) / 1M

Publishing Venue

The IP.com Prior Art Database

Related People

Timo Kunkel: INVENTOR [+4]

Abstract

This device can calibrate display devices and gather information describing the display’s environment. This is achieved using camera equipped mobile devices such as mobile phones as well as specialized wired, or wireless, sensor devices. The described approaches cover simple non-interactive methods such as DVD and Blu-ray based methods, as well as more advanced interactive/iterative approaches using streaming video services as well as wireless technologies such as WiFi and TCP/IP. Further to this, a database approach is suggested which can be used in two directions, either as a ‘Cloud to User’, to support the user’s display calibration by providing additional information regarding the display, and as a ‘User to Cloud’, which gives research and marketing departments information regarding common display setups.

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Invention

Display System Calibration, and Characterization Device.

Abstract

This device can calibrate display devices and gather information describing the display’s environment. This is achieved using camera equipped mobile devices such as mobile phones as well as specialized wired, or wireless, sensor devices. The described approaches cover simple non-interactive methods such as DVD and Blu-ray based methods, as well as more advanced interactive/iterative approaches using streaming video services as well as wireless technologies such as WiFi and TCP/IP. Further to this, a database approach is suggested which can be used in two directions, either as a ‘Cloud to User’, to support the user’s display calibration by providing additional information regarding the display, and as a ‘User to Cloud’, which gives research and marketing departments information regarding common display setups.

Background

The display management algorithms are very powerful tools. A system is needed that provides the display management algorithms with input parameters describing the source and the display environments, as well as elements intrinsic to the imagery itself.

On the colorist side (see ‘source environment’ box below). The parameter describing the environment is measured and collected by the studio or post production facility. There is usually not that much variation in this environment. This information is ideally transported via metadata to the consumer display environment via broadcast, DVD, Blu-Ray or internet stream.  On the consumer side, there is much more variation in the various elements forming the environment. Faster temporal variation can change in minutes to hours, (see Target Environment box below). Slow temporal variationchanges over months. Image Analysis, analyzes the image or video itself such as log average luminance, geometric mean, salient features, and light source detection, sky detection. 

Some of the target parameters are defined by the hardware itself such as primaries although aging has some influence here. Most other parameters need to be measured. The display needs to be characterized and/or calibrated to the prevailing environment and this can be achieved in the following ways:

Measure sporadically (once a month): correct for slow temporal variation

Create profiles (day time, night time): correct for typical ambient conditions

Continuous Measurement: correct for all conditions

Potential Solutions

The following four cases show approaches that can deliver the input parameters to the display management algorithms to varying degrees. Understandably, the more specialized the system, the more accurate the results. But even simple approaches will give more information than no input parameters at all. A sophisticated system can both characterize the display, and measure faster changing environment parameters. Further, it can automatically create a new profile for the display, to compensate for the environment.

Case 1: On...