Author: Henry Koren
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 […]
Error in Extracting CTF file
Error Message: Error in extracting CTF file to ‘C:\ProgramData\Imatest\mcr_cache\4.5\Master\mcrCache9.0.1\imates0’. Details: ‘Could not set last modified time: C:/ProgramData/Imatest/mcr_cache/4.5/Master/mcrCache9.0.1/imates0/toolbox/imaq/imaqextern/drivers/win64/genicam/genICam_v2_4/redist/Microsoft_VC80_CRT_x86_x64.msi: Broken pipe Solution: […]
Imatest Stops Working – Advanced Troubleshooting
Recovering Mathworks Log Files Please recover this log file and send to support@imatest.com The log file name is called “mathworks_<username>.log”. […]
Handling an Lightroom for iPhone RAW DNG file
Adobe DNG converter for windows & mac can be used to re-save iPhone RAW files into supported DNG formats using the following […]