Author: Henry Koren
Connectivity requirements for online or floating license activation
In order to perform online license activation or to use a floating license, Imatest needs to be able to perform […]
Error -4304: Users having problems activating licenses or starting trials
Recently we have been receiving reports of end-users in China being blocked from accessing the Imatest license servers (IP address […]
Color & density reference files in CSV or CGATS format
Color reference files read by Imatest can be CSV or CGATS format containing L*a*b* color and luminance reference data. The […]
Understanding collimator MTF loss using bronze and golden sample testing
by Henry Koren, inspired by Paul Romanczyk, edited by Norman Koren Not all MTF measurement systems will necessarily provide the […]
Henry’s Imatest Training Links
Here are Henry’s favorite Imatest Links that he often mentions during the Imatest Training Class: Day 1 Day 2 https://imatest.com/passfail/
Test Chart Substrate and Sizing Guide
This guide enumerates the possibilities and constraints of our test charts and provides resolution (MTF) information for the different options. […]
Reducing the cross-lab variation of image quality metrics
Abstract As imaging test labs seek to obtain objective performance scores of camera systems, many factors can skew the results.
New 2019 Imatest Licensing – Update Required to Activate
We are migrating to a better, faster licensing platform for our software on January 1, 2019. You may need to […]
Increasing the Repeatability of Your Sharpness Tests
By Robert Sumner With contributions from Ranga Burada, Henry Koren, Brienna Rogers and Norman Koren Consistency is a fundamental aspect of […]
Imatest does not start, unable to read MAT-file
If upon opening Imatest you get something like this: Error: Error using load Unable to read MAT-file C:\ProgramData\Imatest\mcr_cache\5.0\Master\mcrCache9.2\imates0\.matlab\matlabprefs.mat. File […]
Undefined variable “py” or class “py.model.Message”.
With the addition of python routines in Imatest 5.0, several components require a working python installation. When some installation problems […]
High-contrast edge-SFR test targets produce invalid MTF results
The obsolete ISO 12233:2000 standard defines a resolution test target with a high contrast ratio. These are typically produced at […]
Running Imatest With High Sierra
Due to High Sierra’s new file system, old Imatest licenses no longer have the access they need to write properly. […]
How to capture frames from a video stream or RTSP camera
Imatest is still working on implementing RTSP streaming support and other video stream protocols within the software. In the meantime […]
Megapixel suitability for test charts
Megapixel suitability is based on the analysis of the Modulation Transfer Function (MTF) that is obtained from slanted-edge chart images […]
Lightbox Uniformity Comparison
Summary table – Detailed uniformity measurements – How we made the measurements Lightbox summary table. Many are no longer available […]
Measuring the impact of flare light on dynamic range
Abstract The dynamic range of recent HDR image sensors, defined as the range of exposure between saturation and 0 dB […]
How to convert a color image to grayscale
Sometimes an undemosaiced Bayer raw image gets improperly saved into a BMP or TIFF format that includes color channels that […]
Avoiding reflections on transmissive charts for dynamic range and flare testing
The testing of dynamic range and flare requires a proper test chart and environmental setup to get accurate results.High precision […]
DMX Lighting Control Software
Lights such as the Kino Flo Select 31 LED use a DMX control interface to signal changes of light level […]