Stray light (flare) documentation pages
Introduction: Intro to stray light testing and normalized stray light | Outputs from Imatest stray light analysis | History
Background: Examples of stray light | Root Causes | Test overview | Test factors | Test Considerations | Glossary
Calculations: Metric image | Normalization methods | Light source mask methods | Summary Metrics | Analysis Channels | Saturation
Instructions: High-level Imatest analysis instructions (Master and IT) | Computing normalized stray light with Imatest | Motorized Gimbal instructions
Settings: Settings list and INI keys/values | Standards and Recommendations | Configuration file input
Page Contents
Overview
| Standard | Description | Normalization | Note(s) | References |
| Imatest Recommended: New User | These settings are intended to help a new user get some results quickly. | None | Results may not be comparable from sensor to sensor due to the lack of normalization. | |
| Imatest Recommended: Advanced User | These settings are what Imatest recommends for camera-to-camera comparable stray light flare measurement. | Direct Reference Image | In some literature, this is referred to as “Point Source Rejection Ratio (PSRR)”. | |
| IEEE Std 2020-2024: Flare Intensity | Lambertian Reference Image | This has heritage to the Flare Attenuation metric from the IEEE P2020 Pre-Release [2]. | [1] §2.8.1 | |
| IEEE Std 2020-2024: Normalized Flare | Direct Reference Image | This is inspired by “Imatest Recommended Advanced User”. | [1] §2.8.3 |
The calculation settings needed to comply with a standard are not listed as part of the settings page.
Unsupported Parts of Standards
IEEE Std 2020-2024 [1]
The analysis software does not support:
- Mask creation from well-exposed reference images (§2.7.2.3). Note that this requires two exposures for each capture position.
- Changing the source light level when the source is in vs. out of the FOV (§2.6.4). Note this can be done via two analysis runs.
References
[1] IEEE Std 2020:2024 “IEEE Standard for Automotive System Image Quality” https://standards.ieee.org/ieee/2020/6765/
[2] IEEE P2020/D3 – “IEEE Draft Standard for Automotive System Image Quality” https://ieeexplore.ieee.org/document/9969530