Display Effective Color Space Determination
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Solution Overview
Problem
Scene-referred display devices require physical calibration to determine their effective color space, which is time-consuming and expensive, especially for consumer-level displays. Existing methods only allow characterization along a single color dimension at a time, failing to account for multiple dimensions effectively.
Innovation Solution
A method and device for determining the effective color space of a display by obtaining display information, defining a two-dimensional parametric surface for color volume vertices, mapping this surface to a flat bitmap, and allowing user selection of the perceived maximum color. This information is used to determine the effective color space, which is then transmitted to a source for rendering images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If physical calibration with external colorimeter is used, then measurement precision of effective color space is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses software-generated test patterns that replicate the function of physical color calibration targets. By displaying computed test images with known colorimetric properties and analyzing the captured images, the system creates a virtual copy of the calibration process that eliminates the need for external colorimeters while maintaining measurement accuracy
Solution Approach 2:
The display device performs its own calibration by using its built-in camera to capture test patterns displayed on itself. The system self-determines its color space characteristics through software processing of the captured images, eliminating dependency on external calibration equipment and enabling consumer-level devices to perform accurate calibration
2Ease of operation
If traditional single-dimension calibration method is used, then ease of operation is improved, but measurement precision of multi-dimensional color space deteriorates
Solution Approach 1:
The patent transitions from single-dimension color patches to multi-dimensional test patterns that simultaneously encode information across multiple color dimensions. By using test images with variations in multiple colorimetric parameters and analyzing them through matrix operations, the system extracts complete color space characteristics in a single calibration process rather than requiring separate measurements for each dimension
3Measurement precision
If external colorimeter calibration is used, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The system replaces time-consuming physical measurement processes with software-based computational methods. By using captured images of displayed test patterns and processing them through colorimetric algorithms, the system achieves accurate color space determination without the time delays associated with physical colorimeter measurements
Solution Approach 2:
The calibration process is integrated into the normal display operation, allowing calibration to be performed quickly without interrupting the display's useful function. The system continuously captures and processes test patterns during normal operation, enabling rapid calibration that does not require separate dedicated measurement time
Data Source
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AI summary
A method and device for determining an effective color space of a display perform the following steps. A two-dimensional parametric surface that intersects a color volume defined for the display can be defined for at least one color volume vertex (202). A flat bitmap to which the two-dimensional parametric surface is mapped (204) can be displayed (208), on the display, for the at least one color volume vertex. A selection of a point on the flat bitmap that corresponds to a perceived maximum color can be received for the at least one color volume vertex (210). The effective color space of the display can be determined based at least in part on the perceived maximum color selected for the at least one color volume vertex (212).