Author: Henry Koren
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 […]
Calculating Field of View (FoV) using distance settings
For accurate calculation of field of view (FoV) from using Imatest’s SFRplus, eSFR ISO, or Checkerboard, modules, it is critical to use […]
Automating CPIQ analysis Using Imatest IT and Python
The Python interface to Imatest IT provides a simple means of invoking Imatest’s tests. This post will show how Imatest […]
The Effects of misregistration on the dead leaves cross-correlation texture blur analysis
This paper was given as part of the Electronic Imaging 2017 Image Quality and System Performance XIV and Digital Photography and […]