News

SFRreg Target

The SFRreg test target consists of a slanted-edge quadrant pattern enclosed within a circle. It is used for measuring MTF and lateral chromatic aberration. A test image typically contains several targets that are automatically detected and analyzed by Imatest 4.2. (more…)
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High Dynamic Range Target, ITI LED Lightbox

We are pleased to announce our new High Dynamic Range (HDR) test chart with a density range exceeding 120dB (optical density >6.0). This chart allows you to the measure the dynamic range, tonal response and noise of HDR cameras with a single image instead of multiple, exposure bracketed images. It also contains slanted edges for MTF measurements. (more…)

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Color difference ellipses

Starting with Imatest 4.2, Imatest’s two-dimensional color displays— CIELAB a*b*, CIE 1931 xy chromaticity, etc.— in Multicharts, Multitest, Colorcheck, SFRplus, and eSFR ISO can display ellipses that assist in visualizing perceptual color differences. You can select between MacAdam ellipses (of historical interest), or ellipses for ΔCab (familiar but not accurate), ΔC94, and ΔC00 (recommended).

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Imatest version 4.2

Imatest has released Version 4.2. New features include:

SFRreg ModuleAnalyze a camera’s Spatial Frequency Response (sharpness) using automatically-detected slanted edges in registration mark patterns, which can be arbitrarily placed in a camera’s field of view. (more…)

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4.2 Public Beta Release, Imatest Events

Imatest version 4.2 is now available as a public beta. Join our Beta Test Group to access 4.2 updates. Highlights include:

  • SFRreg Module: Analyze the SFR of slanted edges through the automatic
     

    detection of registration mark patterns (circles with two light and two dark quadrants). Use arrays of registration mark targets to test unique imaging systems, including systems with ultra wide angle fisheye lenses (>180 degrees), multiple camera combinations, video and more.

 
  • Point Spread Function (PSF): Imatest can now estimate an imaging system’s loss of resolution (PSF)
     using a pair of collocated, near-sagittal and tangential slanted edges on SFRplus, eSFR ISO and SFRreg targets. Easily analyze and improve sharpness, chromatic aberration, and distortion measurements.
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New High Precision SFRplus Target for GL-30E Lightbox

The High Precision SFRplus Target for GL-30E Lightbox is our most detailed resolution target. You can test high-resolution devices in compact environments using one-third the space required for extra-large Inkjet charts.

(more…)

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New Photographic eSFR ISO & June Trainings

New Photographic eSFR ISO

The ISO 12233:2014 Enhanced eSFR Photographic Target is our newest reflective test chart. Photographic prints have over twice the resolution of inkjet prints, making them more suitable for higher resolution camera systems like DSLRs. The photographic substrate will benefit customers interested in testing high-resolution sensors as well as those performing close-range macro tests.  (more…)

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Announcing Imatest IT Parallel Processing

New Feature: Imatest IT Parallel

Increasing testing throughput

The new Imatest Industrial Testing Parallel uses parallel processing to improve the throughput of Imatest IT and maximize the image processing power of your computing hardware. IT run in parallel enables up to 3x more throughput to support test equipment that requires a high volume of images to be analyzed. IT-P improves the PPH (parts per hour) on assembly lines. 

(more…)

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Infrared Targets, Correction for Slanted-Edge MTF Measurements

Infrared Targets 

Standard Imatest inkjet-printed test charts produced prior to February 2016 work in Near InfraRed (NIR) wavelengths out to approximately 1 micron.

In February 2016 we upgraded our printers and found (to our disappointment) that our new printers do not have the same reflective densities for NIR wavelengths as for visible wavelengths. We are working out solutions to this issue. Please contact us if your needs include NIR. (more…)

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Selecting a Chart: SFRplus and eSFR ISO

SFRplus and eSFR ISO share many similar features and can be used to perform many similar image quality analyses. However, some of their features differ, and understanding which features differ will help you select the most appropriate test chart to analyze your imaging systems. This video outlines key differences between SFRplus and eSFR ISO.

(more…)

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Measuring Multiburst pattern MTF with Stepchart

Measuring MTF is not a typical application for Stepchart— certainly not its primary function— but it can be useful with multiburst patterns, which are a legacy from analog imaging that occasionally appear in the digital world. The multiburst pattern is not one of Imatest’s preferred methods for measuring MTF: see the MTF Measurement Matrix for a concise list. But sometimes customers need to analyze them. This feature is available starting with Imatest 4.1.3 (March 2015).

(more…)

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LSF correction factor for slanted-edge MTF measurements

A correction factor for the slanted-edge MTF (Edge SFR; E-SFR) calculations in SFR, SFRplus, eSFR ISO, SFRreg, and Checkerboard was added to Imatest 4.1.2 (March 2015). This correction factor is included in the ISO 12233:2014 standard, but is not in the older ISO 12233:2000 standard. Because it corrects for an MTF loss caused by the numerical calculation of the Line Spread Function (LSF) from the Edge Spread Function (ESF), we call it the LSF correction factor. (more…)

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Shenzhen Training, Imatest 4.1 Released, New High Stress Target

Shenzhen Training Course

Imatest 4.1 Updates

Batch processing of video file frames for improved temporal resolution, faster frame analysis, noise and artifact testing.

ISO 15739 Visual Noise, SNR and Dynamic Range support for measurements made in color and tone modules, including Multicharts, Multitest, and eSFR ISO. (more…)

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A Study of Slanted-Edge MTF Stability and Repeatability

by Jackson K.M. Roland

Abstract

The slanted-edge method of measuring the spatial frequency response (SFR) as an approximation of the modulation transfer function (MTF) has become a well known and widely (more…)

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February 2015: Managing Supply Chain Image Quality

Managing Supply Chain Image Quality

Imatest just released the white paper Managing Supply Chain Quality with Imatest to outline best practices for putting in place a rigorous manufacturing quality control regime. (more…)

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Imatest 4.0 Release

Imatest is proud to announce the official release of its new 4.0 image quality testing software. The Imatest 4.0 upgrade includes a number of refinements including enhanced automation capabilities and a more robust image quality testing experience. (more…)

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Slanted-Edge versus Siemens Star: A comparison of sensitivity to signal processing

This post addresses concerns about the sensitivity of slanted-edge patterns to signal processing, especially sharpening, and corrects the misconception that sinusoidal patterns, such as the Siemens star (included in the ISO 12233:2014 standard), are insensitive to sharpening, and hence provide more robust and stable MTF measurements. (more…)

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Imatest for Mac OS X 3.10-Beta Now Available

We are happy to announce that Imatest Master 3.10-Beta is now available for Mac OS X

Click here to download

We are confident in the stability of the image quality testing algorithms in this version, but have kept the Beta tag on this release since there may be some minor issues that remain to be resolved before we remove the Beta tag. (more…)

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Sharpness and Texture Analysis using Log F‑Contrast from Imaging-Resource

Imaging-resource.com publishes images of the Imatest Log F-Contrast* chart in its excellent camera reviews. These images contain valuable information about camera quality— how sharpness and texture response are affected by image processing— but they need to be processed by Imatest to reveal the important information they contain.

*F is an abbreviation for Frequency in Log F-Contrast.

(more…)

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No Perfect Lens, No Perfect Lens Test

Roger Cicala of LensRentals.com has completed the second part of his two part series investigating lens testing. (more…)

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