Author: Henry Koren
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 […]
Measuring MTF with wedges: pitfalls and best practices
This paper was given as part of the Electronic Imaging 2017 Autonomous Vehicles and Machine session. When: Monday, January 30, […]
Best practices for using transmissive test charts
Light Source The most uniform light source available would be an integrating sphere, but these come with considerable size […]
How to get support for your image acquisition hardware
Not all hardware is supported by Imatest or Imatest IT’s acquire image routine. In order to obtain support there are a number […]
Gamma, Chart Contrast and MTF Calculations
A fuller and more up-to-date explanation of gamma, including how to obtain it for slanted-edge MTF calculations can be found […]
Testing a macro lens using Checkerboard and Micro Multi-slide
Imatest’s Checkerboard module is our new flagship module for automated analysis of sharpness, distortion and chromatic aberration from a checkerboard (AKA chessboard) pattern. The big benefit of using the checkerboard is that there are looser framing requirements than with other kinds of test targets. While checkerboard lacks the color and tone analysis provided by SFRplus and eSFR ISO, these features are not available on the high precision chrome on glass substrate, so the checkerboard is the optimal pattern for this test.
Account Administration for Floating Licenses
Floating licenses can remove a lot of headache in keeping track of your licenses by allowing everyone on your team […]
Imatest shuts down intermittently due to video driver problem
Symptom Imatest version 4.2+ intermittently halts. A MATLAB crash dump file is generated in the user’s %temp% folder. The crash […]
Visual C++ Runtime Library: “The Application has requested the Runtime to terminate in an unusual way. “
Symptoms of problem: Running the library leads to this error: Root cause of problem: This error is typically the […]