ISO 20462-3:2012 PDF

Name: ISO 20462-3:2012 — Photography — Psychophysical experimental methods for estimating image quality — Part 3: Quality ruler method
SKU: ISO 20462-3:2012
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Photography — Psychophysical experimental methods for estimating image quality — Part 3: Quality ruler method

Название (английский):

ISO 20462-3:2012

Photography — Psychophysical experimental methods for estimating image quality — Part 3: Quality ruler method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 32
Дата публикации:: 9 мая 2012 г.
Издание:: ISO IS 20462 edition 2 version 1
ICS:: 37.040.01

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Описание (английский):

ISO 20462-3:2012 specifies: the nature of a quality ruler; hardcopy and softcopy implementations of quality rulers; how quality rulers may be generated or obtained; and the standard quality scale (SQS), a fixed numerical scale that may be measured using quality rulers.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 20462-3:2012 - Photography - Psychophysical experimental methods for estimating image quality - Part 3: Quality ruler method describes a standardized psychophysical procedure for measuring image quality using a quality ruler. The standard defines the nature of quality rulers, both hardcopy and softcopy implementations, how to generate or obtain ruler stimuli, and the Standard Quality Scale (SQS) - a fixed numerical scale calibrated in units of just noticeable differences (JNDs).

Key takeaways:

The SQS is anchored to physical references, with one SQS unit ≈ one JND and a zero point corresponding to minimal image information.

Digital Reference Stimuli (DRS) and Standard Reference Stimuli (SRS) are provided or referenced for absolute and relative calibration when viewed under controlled conditions.

Key technical topics and requirements

Nature and construction of quality rulers: specification of ordered univariate reference stimuli that differ by known JND increments for quality or individual attributes.

Hardcopy and softcopy implementations: physical apparatus, reference prints (SRS), display hardware requirements, and controlling software for softcopy experiments.

Reference stimuli and generation: guidance on producing quality ruler images, including calibration workflows and available DRS/SRS resources.

Standard Quality Scale (SQS): properties, procedures for primary and secondary SQS determinations, and how observer ratings map to JNDs in real time.

Measurement and calibration methods: scene-dependent ruler calibration, Modulation Transfer Functions (MTFs) considerations, and required experimental conditions and reporting.

Psychophysical context: relation to paired-comparison and magnitude-estimation approaches; use of observer instructions, experiment design, and data reduction to express differences in JND units.

Supporting material: informative annexes with sample instructions, example datasets, calibration notes, and even sample code for softcopy experiments.

Note: the document references viewing conditions (ISO 3664) and includes a notice about potential patent claims related to the quality ruler method.

Practical applications

Imaging system testing: objective comparison of cameras, scanners, printers, and displays using a calibrated perceptual scale.

Algorithm evaluation: quantifying visible improvements or degradations from image processing (sharpening, denoising, compression).

Quality assurance and R&D: rapid, JND-calibrated assessments during product development or manufacturing.

Research and standardization: experiments requiring absolute or relative image-quality scales that are comparable across labs and studies.

Related standards

ISO 20462-1: Overview of psychophysical elements

ISO 20462-2: Triplet comparison method

ISO 3664: Viewing conditions for image assessment

Keywords: ISO 20462-3:2012, quality ruler method, image quality, Standard Quality Scale (SQS), JND, digital reference stimuli (DRS), standard reference stimuli (SRS), psychophysical methods, MTF, image calibration.

ISO 20462-3:2012 PDF

Abstract

Похожие стандарты

Overview

Key technical topics and requirements

Practical applications

Who should use this standard

Related standards

Технические детали

SIST ISO 3664:2025

Graphic technology and photography - Viewing conditions

SIST ISO 20462-1:2011

Photography - Psychophysical experimental methods for estimating image quality - Part 1: Overview of psychoph…

SIST ISO 20462-2:2011

Photography - Psychophysical experimental methods for estimating image quality - Part 2: Triplet comparison m…