Standards – Imatest

24.2 Concentric Rings FOV

Henry Koren — Fri, 04 Oct 2024 00:00:00 +0000

The Concentric Rings Field of View Module newly available in Imatest 24.2 offers an innovative solution for accurately measuring field of view based on ISO 8600-3:2019 Standard methods.

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Imatest 2020.2 supports EMVA1288

Wed, 23 Jun 2021 00:00:00 +0000

EMVA1288 Machine Vision introduced in Imatest Version 2020.2

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Imatest 2020.2 ISO 17957 Shading Measurements

Tue, 02 Mar 2021 00:00:00 +0000

ISO 17957 Shading Measurements new in Imatest version 2020.2

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Reducing the Cross-Lab Variation of Image Quality Metrics

Henry Koren — Tue, 15 Jan 2019 07:00:00 +0000

Henry Koren of Imatest presents this IEEE Camera Phone Image Quality (CPIQ) paper at Electronic Imaging 2019, on behalf of the IEEE CPIQ Conformity Assessment Steering Committee (CASC). Round-robin studies tested the same mobile devices in different labs and found many things that skew results: near-infrared energy in light sources meant to simulate CIE illuminants, the opal diffusers used for uniformity testing, how scene framing changes white balance and exposure, and how chart quality and texture frequency content affect texture blur scores. The talk introduces a test procedure to reduce lab-to-lab variation and a way to assess whether an independent lab conforms to the IEEE CPIQ standard.

See Reducing the cross-lab variation of image quality metrics for the abstract, the IEEE 1858 standard and test plan, and the presentation slides. Also on YouTube.

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The Effects of Misregistration on the Dead Leaves Cross-Correlation Texture Blur Analysis (ISO 19567-2)

Henry Koren — Tue, 31 Jan 2017 19:10:00 +0000

Robert Sumner presents the paper at Electronic Imaging 2017 (Image Quality and System Performance XIV, January 31, 2017), with Ranga Burada and Noah Kram. The dead leaves pattern is widely used to measure how well cameras preserve fine texture, and newer cross-correlation methods promise more robust results than comparing power spectra. The talk shows how small misregistration between the captured image and the reference pattern affects those cross-correlation texture blur measurements per ISO 19567-2.

Read the abstract and download the paper in The Effects of Misregistration on the Dead Leaves Cross-Correlation Texture Blur Analysis (PDF). Also on YouTube.

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A Study of Slanted-Edge MTF Stability and Repeatability

Tue, 17 Feb 2015 00:00:00 +0000

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 used image quality testing method over the last 10 years. This method has been adopted by multiple international standards including ISO and IEEE. Nearly every commercially available image quality testing software includes the slanted-edge method.

Presented by Jackson K.M. Roland at Electronic Imaging 2015 (Proc. SPIE 9396, Image Quality and System Performance XII). Read the paper, the 2021 correction to its angle equation, and get the MATLAB code and test images in A Study of Slanted-Edge MTF Stability and Repeatability.

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