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LED Stage Calibration for In-camera VFX

Brompton Dynamic Calibration

LED panel calibration is a essential element of any in-camera VFX production. The calibration across panels is designed to address three main areas: colour / brightness formatting, uniformity and seamlessness. Correct colours on the LED stage itself is one of the most key, yet difficult processes of calibration. Brompton Technologies is combating this issue with the new Dynamic Calibration engine in the Tessera processers. Title image credit MGX Films.

What is Dynamic Calibration?

Dynamic Calibration is Brompton Technologies new and improved calibration process for both colour gamut’s and brightness of LED panels. Typically calibration of LED panels is focused on the maintenance of LED uniformity across  the entire display which is evidently important but previously achieved through matching all LED’s to the dimmest and palest LED, sacrificing both brightness and colour gamut’s.

Dynamic Calibration is a new approach to achieving uniformity whilst maintaining all colour gamut’s and brightness ability of each individual LED. The legacy approach to LED panel calibration is to apply a fixed factory specified calibration across all content. Dynamic Calibration is a more flexible method, harnessing both user inputs and parallel computing through R2’s Dynamic Engine.

Brompton Technology provides at-a-glance performance assessment for LED panels | LiveDesignOnline

How Does Dynamic Calibration Work?

Dynamic Calibration is done through the R2 Dynamic engine interface on the Tessera processor. The engine gathers and analyses several different data sets to provide the correct calibration. The data sets collected are:

  • Video Pixel Resolution
  • Video Meta Data
  • Dynamic Calibration Meta Data
  • Capacility of each LED
  • User Preferences

NEW DYNAMIC CALIBRATION FEATURES FOR BROMPTON TECHNOLOGY PROCESSORS ANNOUNCED AT LDI 2019 - Brompton Technology

This data is then analyzed in real-time without any increase in latency and decides on the best way to drive each LED. In areas of extreme peak brightness the Dynamic engine will harness the full brightness of them LEDs, and the same for the images saturation the engine will harness the full and correct colour gamut available. Colour processing algorithyms are harnessed in the process to ensure visual quailty is maintainted and to procted the LED panel, ensuring LEDs arent pushed beyond designed limits. The benefits of Dynamic Calibration is as follows:

  • Brighter whites
  • higher contrast ratios
  • more saturated colours
  •  true-to-life colour accuracy

Dynamic Calibration also provides user dynamic ability, allowing users to adjust brightness, primary colours and white points all in real-time (seamlessly for live events settings) without the need of any recalibration processes.

Hydra Calibration System

BROMPTON TECHNOLOGY'S HYDRA SYSTEM - ADVANCED MEASUREMENT FOR LED PANELS - AV Integration

To benefit from Dynamic Calibration an LED panel must be fitted with a Tessera R2 receiver card and needs to be measured using Hydra – an advanced measurement system custom-designed for LED panels. Hydra is an all-in-one solution incorporating all the measurement instruments and processing required for panel measurements.

Designed to have minimal set-up; align the Hydra with the panel at either 4m or 8m. To measure a panel enter a name and a measurement temperature  there is no configuration of brightness or colour targets required for Dynamic Calibration. The system incorporates comprehensive error checks to ensure correct alignment of panels and correct measurement temperature, minimising the potential for user error. It can additionally generate reports in multiple languages to give an objective assessment of panel performance, making it straightforward to confirm that each new batch of panels meets your specifications.

See the full Brompton technology documentation for Dynamic Calibration and Hydra Here.

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