ISO 19264-1:2021 Photography — Archiving systems — Imaging systems quality analysis —Part 1: Reflective originals

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Photography — Archiving systems — Imaging systems quality analysis —Part 1: Reflective originals是于2021-06发布的ISO标准，适用于全球范围。

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INTERNATIONAL STANDARD ISO 19264-1:2021(E)

Photography — Archiving systems — Imaging systems quality analysis —

Part 1: Reflective originals

1 Scope

This document describes a method for analysing imaging systems quality in the area of cultural heritage imaging. The method described analyses multiple imaging systems quality characteristics from a single image of a specified test target. The specification states which characteristics are measured, how they are measured, and how the results of the analysis need to be presented.

This specification applies to scanners and digital cameras used for digitization of cultural heritage material.

NOTE This document addresses imaging of reflective originals, a future part two will address imaging of transparent originals.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 12233, Photography — Electronic still picture imaging — Resolution and spatial frequency responses

ISO 14524, Photography — Electronic still-picture cameras — Methods for measuring opto-electronic conversion functions (OECFs)

ISO 15739, Photography — Electronic still-picture imaging — Noise measurements

ISO 16067-1, Photography — Spatial resolution measurements of electronic scanners for photographic images — Part 1: Scanners for reflective media

ISO 17957, Photography — Digital cameras — Shading measurements

ISO 21550, Photography — Electronic scanners for photographic images — Dynamic range measurements

ISO/CIE 11664-4, Colorimetry — Part 4: CIE 1976 L*a*b* colour space

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https://w ww. iso. org/o bp

— IEC Electropedia: available at http:// www .electropedia. org/

ISO 19264-1:2021(E)

3.1

acutance

numerical value that correlates to some extent with subjective image sharpness

[SOURCE: ISO 19262:2015, 3.1]

3.2

banding

unwanted stripes or bands that occur in a digital image

Note 1 to entry: Bands are usually caused by fixed pattern noise of sensors in scanners, interference problems between electronic parts of a camera, or by too-coarse quantization.

[SOURCE: ISO 19262:2015, 3.9, modified — addition of “or by too-coarse quantization” in the Note 1 to entry.]

3.3

checkerboard

regular squared dark and bright structure on a surface like the one used on a chess board

[SOURCE: ISO 19262:2015, 3.18]

3.4

colour misregistration

colour-to-colour spatial dislocation of otherwise spatially coincident colour features of an imaged object

[SOURCE: ISO 19262:2015, 3.42]

3.5

digitization

act of generating a digital (quantized) representation of a continuous signal

[SOURCE: ISO 20998-1:2006, 2.7, modified — The Note 1 to entry has been deleted.]

3.6

distortion

geometric distortion

displacement from the ideal shape of a subject (lying on a plane parallel to the image plane) in the recorded image

Note 1 to entry: It basically derives from variation of lateral magnification in the image field of a camera lens and results in straight lines being rendered as curves. There are other factors to induce geometric distortion, for example rotational asymmetry of a camera lens or position shift processing in a camera imaging process.

[SOURCE: ISO 19262:2015, 3.82]

3.7

dynamic range

difference, over a given luminance range, between maximum and minimum signal levels, expressed in decibels, contrast ratios or f-stops

Note 1 to entry: The minimum signal level needs to be greater than a specified usable signal level.

Note 2 to entry: This definition is derived from IEC 702-04-23 but was altered to match the imaging and archiving application.

[SOURCE: ISO 19262:2015, 3.87]

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