ISO 5926:2023

Overview

ISO 5926:2023 is an international standard published by the International Organization for Standardization (ISO) that specifies technical requirements and test methods for digital cinema stereoscopic projection systems. This standard addresses the precise measurement of image parameters produced by digital cinema stereoscopic projection optical systems, ensuring consistent image quality across theaters worldwide. Applicable to both review rooms and large theatrical venues, ISO 5926:2023 provides a framework for evaluating luminance, uniformity, and chromaticity, which are critical for delivering optimal 3D viewing experiences.

Key Topics

• Centre Luminance: Defines the average luminance of the white screen center as seen by both left and right eyes in stereoscopic projection. Three target luminance levels are specified depending on venue type:

  • Target A (Theaters): 48.0 cd/m² ±10.2
  • Target B: 24.0 cd/m² ±5.1
  • Target C: 15.5 cd/m² ±3.3

• Luminance Difference Ratio: The maximum allowable difference in luminance between the left and right eye images is capped at 5% to maintain comfortable stereo perception.

• Side Luminance Uniformity: Requires consistent luminance ratios between the edges and center of the screen for both eyes, specifying a uniformity range of 75% to 90% of the center luminance to avoid image quality degradation at screen edges.

• Centre White Chromaticity: Specifies a color coordinate range (x = 0.314 ± 0.006, y = 0.351 ± 0.006) for the white point at the screen center to ensure accurate color reproduction in stereoscopic content.

• Measurement Methods: Details the use of spectroradiometers and spot photometers that comply with relevant ISO standards (ISO 26431-1:2008 and ISO/CIE 11664-1) for capturing luminance and chromaticity data under controlled, stabilized projector conditions.

Applications

ISO 5926:2023 is invaluable for:

• Cinematographers and Post-production: Provides benchmarks for optimizing stereoscopic content that meets targeted luminance and color specifications, helping filmmakers ensure playback fidelity in diverse screening environments.

• Theater Operators and Equipment Manufacturers: Establishes standardized test methods for validating projector performance, optical system quality, and stereoscopic glasses alignment to deliver consistent 3D viewing without viewer discomfort or artifacts.

• Quality Control and Maintenance: Assists technicians in routine calibration and troubleshooting of digital stereoscopic cinema systems by specifying detailed measurement locations, procedures, and equipment requirements.

• Technology Developers: Guides the design and development of next-generation digital stereoscopic projection systems to meet international quality standards, fostering interoperability and global content distribution.

Related Standards

ISO 5926:2023 works in conjunction with several key standards to support digital cinema quality assurance:

• ISO 26431-1:2008 – Digital cinema quality - Part 1: Screen luminance level, chromaticity, and uniformity. This standard establishes related luminance and chromaticity parameters for 2D and 3D cinema environments.

• ISO/CIE 11664-1 – Colorimetry - Part 1: CIE standard colorimetric observers. This defines the colorimetric basis used for photometric and spectroradiometric measurements in stereoscopic projection.

• ISO/IEC Directives – Guide the editorial and approval processes for ISO standards development and maintenance.

By adhering to ISO 5926:2023, the digital cinema industry can achieve uniform stereoscopic projection standards worldwide, enhancing viewer immersion and satisfaction through scientifically validated image quality parameters and test protocols.