IEC 63145-22-20:2024
(Main)Eyewear display - Part 22-20: Specific measurement methods for AR type - Image quality
Eyewear display - Part 22-20: Specific measurement methods for AR type - Image quality
IEC 63145-22-20:2024 specifies the standard measuring conditions and measurement methods for determining the image quality of augmented reality (AR) type eyewear displays. This document applies to see-through type (AR glasses) eyewear displays using virtual image optics.
See-through type displays (VR glasses), contact lens-type displays, and retina direct projection displays are out of the scope of this document.
The content of the corrigendum 1 (2024-09) has been included in this copy.
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IEC 63145-22-20 ®
Edition 1.0 2024-02
INTERNATIONAL
STANDARD
colour
inside
Eyewear display –
Part 22-20: Specific measurement methods for AR type – Image quality
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IEC 63145-22-20 ®
Edition 1.0 2024-02
INTERNATIONAL
STANDARD
colour
inside
Eyewear display –
Part 22-20: Specific measurement methods for AR type – Image quality
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 17.180.99; 31.120 ISBN 978-2-8322-8131-4
– 2 – IEC 63145-22-20:2024 © IEC 2024
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms, definitions, abbreviated terms and letter symbols . 6
3.1 Terms and definitions . 6
3.2 Abbreviated terms . 7
3.3 Letter symbols (quantity symbols or unit symbols) . 7
4 Standard measuring conditions . 8
4.1 Standard environment conditions . 8
4.2 Power supply . 8
4.3 Warm-up time . 8
4.4 Dark room condition . 8
5 Measurement systems . 8
5.1 Standard coordinate system . 8
5.2 Measurement equipment . 9
5.2.1 General . 9
5.2.2 Light measuring device (LMD) . 9
5.2.3 Stage conditions . 9
5.2.4 Setup conditions . 10
6 Background and see-through real scene conditions . 10
6.1 General . 10
6.2 Ambient background . 11
6.3 Raster pattern (or grille pattern) targets . 11
6.4 Crosshair pattern target . 12
7 Test patterns of the virtual image. 13
7.1 General . 13
7.2 Checkerboard pattern . 13
7.3 Solid colour patterns . 13
7.4 Raster patterns . 13
7.5 Measuring points . 13
8 Measurement methods . 13
8.1 Preparation . 13
8.2 Luminous transmittance and spectral transmittance with an ambient diffuse
illumination . 14
8.2.1 General . 14
8.2.2 Measuring conditions . 14
8.2.3 Measuring procedures . 14
8.2.4 Calculation . 14
8.2.5 Report . 16
8.3 Parameters related to virtual images . 16
8.3.1 Ambient contrast ratio . 16
8.3.2 Ambient chromaticity and chromaticity gamut area . 18
8.3.3 Static image resolution . 20
8.3.4 Secondary image effect . 22
8.3.5 Flicker . 24
8.4 Parameters related to see-through real scene . 26
8.4.1 See-through FOV . 26
8.4.2 Variations in luminance and chromaticity of see-through real scenes . 29
8.4.3 Real rectangular scene distortion. 32
8.4.4 Real local geometric distortion . 34
8.4.5 Ratio of Michelson contrast of the real scene . 36
8.4.6 Luminance ratio of virtual image versus background . 37
8.4.7 Monocular positioning accuracy . 38
Bibliography . 41
Figure 1 – Spherical coordinate system . 9
Figure 2 – Three-dimensional Cartesian coordinate system . 9
Figure 3 – Example of the ambient background . 11
Figure 4 – Example of the setting for a raster pattern target . 12
Figure 5 – Example of the setting for a crosshair pattern target . 12
Figure 6 – Variation of Michelson contrast (i.e. luminance modulation) with line width . 21
Figure 7 – Example of a secondary image . 23
Figure 8 – Temporal contrast sensitivity function . 25
Figure 9 – Example of the see-through FOV . 28
Figure 10 – Measuring points of the real scene (origin at the centre B , corresponding
to the optical axis of the DUT) . 29
Figure 11 – Example of a real local geometric distortion . 35
Figure 12 – Schematic diagram of the positioning measurement . 39
Table 1 – Letter symbols (quantity symbols or unit symbols) . 7
Table 2 – Temporal contrast sensitivity function . 25
Table 3 – Example of the angle deviation of the 9 points and the distortions . 34
– 4 – IEC 63145-22-20:2024 © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EYEWEAR DISPLAY –
Part 22-20: Specific measurement methods for AR type –
Image quality
FOREWORD
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