LED Volume Color Calibration via Tri-Color Matrix Correction
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Solution Overview
Problem
LED volume virtual production stages face color rendition issues, particularly with skin tones appearing overly saturated and pink due to the 'peaky' spectral output of narrow-band red, green, and blue LEDs, which existing calibration systems fail to correct for both in-camera and out-of-camera LED pixels.
Innovation Solution
A computer-implemented method generates three color correction matrices based on calibration images of pure red, green, and blue LEDs, applying a first pre-correction matrix to out-of-camera pixels, a post-correction matrix to final imagery, and a second pre-correction matrix to in-camera pixels, adjusting for LED panel reflection using an RGB offset.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If narrow-band red, green, and blue LEDs are used to produce light in almost all human-observable colors, then the LED panels can accurately reproduce a wide range of natural and artificial lighting scenarios, but the peaky spectral output causes skin tones to appear overly saturated and too pink in hue
Solution Approach 1:
The patent applies color transform matrices to modify the RGB color values, transforming the peaky spectral output characteristics into a more natural color representation. By changing the parameter space of color values through matrix transformations, the system maintains the versatility of narrow-band LEDs while correcting their color accuracy issues, particularly for skin tones
Solution Approach 2:
The patent introduces color transform matrices as an intermediary between the LED light output and the final captured image. These matrices act as a mediator that translates the peaky spectral characteristics into natural-looking colors, allowing the system to use narrow-band LEDs without directly exposing their color accuracy limitations
2Manufacturing precision
If existing calibration systems are used, then some color correction can be achieved, but they fail to correct color rendition for both in-camera and out-of-camera LED pixels simultaneously
Solution Approach 1:
The patent develops a universal color correction system that simultaneously handles both in-camera and out-of-camera LED pixels through a unified set of color transform matrices. This multi-functional approach allows the same calibration methodology to correct colors across different camera frustums and LED panel configurations, making the system broadly applicable to various virtual production stage setups
3Manufacturing precision
If color correction matrices are applied to both LED displayed content and final imagery, then comprehensive color accuracy is achieved, but the system complexity increases with multiple correction steps
Solution Approach 1:
The patent segments the color correction process into distinct components: pre-correction matrices applied to LED displayed content and post-correction matrices applied to final imagery. This segmentation allows each matrix to address specific aspects of color accuracy independently, making the overall complex system more manageable and systematically correctable
Data Source
AI summary
The disclosed computer-implemented method includes systems for optimizing color rendition in an LED volume virtual production stage. For example, the described systems optimize or correct color rendition by applying a series of color correction matrices to color pixel values within the virtual production stage and to final captured imagery filmed within the virtual production stage. The described systems generate the color correction matrices from four calibration images taken within the virtual production stage. Various other methods, systems, and computer-readable media are also disclosed.