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Contents Page
Foreword........................................................................................................................................................................................v
Introduction..................................................................................................................................................................vi
1 Scope ...................................................................................................................................................................1
2 Normative references ....................................................................................................................................1
3 Terms and definitions ...................................................................................................................................1
4 Test conditions.................................................................................................................................................5
4.1 Test chart illumination........................................................................................................................................5
4.2 Camera framing and lens focal length setting ..........................................................................................5
4.3 Camera focusing ....................................................................................................................................................6
4.4 Camera settings .....................................................................................................................................................6
4.5 White balance .........................................................................................................................................................6
4.6 Luminance and colour measurements ........................................................................................................6
4.7 Gamma correction ................................................................................................................................................6
5 Visual resolution measurement ................................................................................................................7
5.1 General.......................................................................................................................................................................7
5.2 Test chart ..................................................................................................................................................................7
5.2.1 General.....................................................................................................................................................7
5.2.2 Material....................................................................................................................................................7
5.2.3 Size.............................................................................................................................................................7
5.2.4 Test patterns..........................................................................................................................................7
5.2.5 Test pattern modulation...................................................................................................................8
5.2.6 Positional tolerance............................................................................................................................8
5.3 Rules of judgement for visual observation ................................................................................................8
5.3.1 Rules of judgement .............................................................................................................................8
5.3.2 An example of a correct visual judgement................................................................................9
6 Edge-based spatial frequency response (e-SFR)..................................................................................9
6.1 General.......................................................................................................................................................................9
6.2 Methodology.........................................................................................................................................................10
6.2.1 Selection of the edge region of interest (ROI) ......................................................................10
6.2.2 Transformation into effective exposure .................................................................................10
6.2.3 Estimation of the location of the edge .....................................................................................10
6.2.4 Formation of a super-sampled line spread function array ................................................12
6.2.5 Computation of the e-SFR .............................................................................................................13
7 Sine-based spatial frequency response (s-SFR) measurement ....................................................13
8 Presentation of results ...............................................................................................................................14
8.1 General....................................................................................................................................................................14
8.2 Resolution..............................................................................................................................................................14
8.2.1 General ..................................................................................................................................................14
8.2.2 Basic presentation............................................................................................................................14
8.2.3 Representative presentation .......................................................................................................14
8.3 Spatial frequency response (SFR)...............................................................................................................15
8.3.1 General ..................................................................................................................................................15
8.3.2 Spatial frequency response ..........................................................................................................15
8.3.3 Report of resolution value derived from the s-SFR ...........................................................16
Annex A (informative) CIPA resolution test chart ............................................................................................17
Annex B (informative) Visual resolution measurement software..............................................................23
Annex C (informative) Low contrast edge SFR test chart with OECF patches .........................................28
Annex D (normative) Edge spatial frequency response (e-SFR) algorithm.............................................30
Annex E (normative) Sine wave star test chart .................................................................................................33
