For beginners: We recommend these web pages for getting started:
|Offline documentation||Download the website for offline view (with a web browser)|
||IQ factors (KPIs) measured by Imatest, with links to detailed descriptions and instructions.|
|Sharpness||Introductions to sharpness and sharpening; comparisons of different charts; chart quality limitations & how to overcome them|
|Other IQ factors||Noise, SNR, Temporal noise, Dynamic Range (DR), Chromatic Aberrations, Distortion, Veiling glare, Shannon information capacity, etc.|
|IQ Utilities||Image Processing, SSIM, Image Statistics, Radial geometry|
|Getting started||Why Imatest?, Test charts, Lighting, Image capture technique, Setting up your lab, Using Imatest software|
|Start using Imatest software||Installation, Using Imatest, Image file formats & devices, Activation/Deactivation|
|General Instructions||Special standards, Supported devices, Test manager, Raw files, Test lab, INI files, Pass/Fail Monitor|
|Acquiring images||Files, formats, devices, and utilities for acquiring images|
|Knowledge Base highlights||Links to articles for troubleshooting, activation, and general advice on operation.|
|Troubleshooting||What to do when Imatest doesn’t work as expected|
|Slanted-Edge sharpness modules||SFR (manual ROIs), SFRplus, eSFR ISO, SFRreg, Checkerboard (auto ROI detection)
The four auto-detection slanted-edge sharpness module are compared here.
|Other sharpness modules||Log F-Contrast, Star, Random/Dead Leaves/Spilled coins, Wedge, Sharpness utilities & postprocessors|
|Sharpness utilities & postprocessors||MTF Compare, Image stabilization, Batchview, Find ShGarpest Files|
|Tone, Color, Noise & Dynamic Range modules||Color/Tone (Interactive & Auto), CCM (Color Correction Matrix), CDP, Contrast Resolution, Colorcheck, Stepchart, Measuring patches, Gamutvision for evaluating ICC color profiles and gamut mapping.|
|Spatial & Flat field modules||Flatfield, Flatfield Interactive, Distortion, Dot pattern, Testing displays|
|Miscellaneous modules and utilities||Lighting Control, Arbitrary charts, Device Manager, Auto White Balance/Exposure/Focus (AWB, AE, AF), Printing & displaying test charts, Rename Files, Educational Apps, Database|
|Industrial Testing edition||Modules, Instructions for various interfaces (EXE, C, C++, Python, .NET), INI file reference, Pass/Fail, Operator Console, Speedup|
|Appendix||FAQ, Versions, Troubleshooting, Change Log, INI file reference, License|
General — Introduction to Image Quality Factors (Key Performance Indicators – KPIs)
Image quality factors – Overview and Imatest measurements Recommended for getting started.
Introduction – Summary table – Image quality factors – Sharpness – Texture – Noise – Information capacity – Tonal response – Dynamic range – Color accuracy – Distortion – Uniformity – Blemishes – Exposure accuracy/ISO sensitivity – Lateral chromatic aberration – Stray light (flare) – Veiling glare – Color moiré – Software artifacts – Data compression – Printer quality factors
Sharpness – What is it and how is it measured?
Introduction – MTF – MTF equation – Spatial frequency units – Summary metrics– MTF measurement matrix – comparing measurement techniques – Slanted-Edge measurements – Why a slanted edge? – Clipping – Noise reduction – Interpreting MTF50 – AutoFocus (AF) Speed – Calculation details – Slanted-edge algorithm – Imatest vs. ISO calculation – Links
Sharpening – and Standardized Sharpening for comparing cameras
Comparing sharpness in different cameras – The application: “Image-centric” (for pictorial images) or “object-centric” (for medical, machine vision, etc.) strongly affects how images are compared.
Slanted-edge versus Siemens Star – A comparison of sensitivity to signal processing
Slanted-edge versus Siemens Star, Part 2 – Results for four additional cameras
Slanted-edge measurement consistency and repeatability – comparing different ISO speeds and ROI sizes. Incomplete, but still useful.
Nyquist frequency, aliasing, and Color Moire – introducing a color aliasing metric derived from hyperbolic wedges.
Camera Monitor Systems (CMS) – for automotive mirror replacement systems and some endoscopes
Temporal Noise – comparing the two-image and multi-image measurements
Three November 2023 white papers (too many?) contain the latest information capacity measurements and results, including Edge SNRi and filter design. Until Imatest 24.1 is released in spring, 2024, they are available in the Imatest 24.1 Pilot Program.
Introduction to Image Information Metrics is the most concise introduction to image information capacity and related metrics, with a minimum number of equations and minimal technical detail. We may shrink it further for use in a brochure for marketing.
Image Information Metrics in Imatest is a concise and readable introduction to image information capacity and related object and edge detection metrics with moderate technical detail.
Image Information Metrics and Applications: Reference (41 pages) has all the equations and technical detail, but it may be difficult to read. It’s the reference for the other documents.
|Information capacity news and links are on Solutions – Information capacity.|
|The Siemens star method, introduced in 2020, is slower but better for observing the effects of image processing artifacts (demosaicing, data compression, etc.).|
Image quality utilities let you degrade, enhance, examine, or analyze any image (not just test charts)
|Please note: Each Imatest license can be activated on only one computer at a time, but the activation can be easily moved between computers, especially if they’re online. You can install Imatest– and keep it installed– on as many computers as you like (Macintosh as well as Windows– your license works for both; you never have to uninstall it). To move the activation to another computer, you’ll need to deactivate it on the old computer then activate it on the new one, following the instructions above. You may do this as often as you like.|
Saved settings – Imatest-v2.ini and INI files for use with Imatest IT
Using Direct Image Acquisition – Acquiring images directly from devices
Sony AYA Interface for direct image acquisition
The Imatest Functional Interface – A simplified interface for running tests with consistent settings
Knowledge Base highlights – Links to articles for troubleshooting, activation, and general advice on operation.
Tone, Color, Noise, and Dynamic Range
Black point compensation demystified – Round trips for evaluating printer profile quality
Index of the Table of Contents
Image quality — Sharpness — Other IQ factors — IQ Utilities — Getting started — Imatest Instructions – general —
Troubleshooting — Knowledge Base highlights — Slanted-Edge sharpness modules — Other sharpness modules —
Tone, Color, Noise & Dynamic Range modules — Spatial & Uniformity modules —
Miscellaneous modules and utilities — Industrial Testing edition — Appendix