Pro and contra using ISO 12233 for resolution measurement · using ISO 12233 for resolution...
Transcript of Pro and contra using ISO 12233 for resolution measurement · using ISO 12233 for resolution...
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23.09.2002 Image Engineering Dietmar Wueller 1
Pro and contra using ISO 12233
for resolution measurement
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23.09.2002 Image Engineering Dietmar Wueller 2
SFR Measurement
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23.09.2002 Image Engineering Dietmar Wueller 3
SFR Measurement
Figure 4 — Flow-chart of SFR measurement algorithm
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SFR Measurement
SFR Measurement has proven
• Reliability.• High accuracy.
![Page 5: Pro and contra using ISO 12233 for resolution measurement · using ISO 12233 for resolution measurement. 23.09.2002 Image Engineering Dietmar Wueller 2 SFR Measurement. 23.09.2002](https://reader030.fdocuments.net/reader030/viewer/2022040315/5e1cdcc941096659f0784cf9/html5/thumbnails/5.jpg)
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SFR Measurement
SFR of Leica S1 Pro
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Frequency [LW/PH]
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Aliasing Region
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SFR Measurement
But problems appear if the camera applies:
• Sharpening.• Aliasing artifacts.• Artifacts caused by JPEG
compression.
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23.09.2002 Image Engineering Dietmar Wueller 7
SFR Measurement
SFR Olympus Camedia C-1400XL
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Frequency [LW/PH]
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SFR Measurement
Consequence:
• The SFR does give the correct edge analysis!
• But the result does not tell anything about the ability of the camera to capture fine detail.
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23.09.2002 Image Engineering Dietmar Wueller 9
Visual analysis from ISO 12233 chart
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23.09.2002 Image Engineering Dietmar Wueller 10
Visual analysis from ISO 12233 chart
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23.09.2002 Image Engineering Dietmar Wueller 11
Visual analysis from ISO 12233 chart
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Kontrast analysis from ISO 12233 chart
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Frequency [LW/PH]
Dig
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23.09.2002 Image Engineering Dietmar Wueller 13
Contrast analysis from ISO 12233 chart
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Problem:
• Where to draw the line for a limiting resolution?!
Contrast analysis from ISO 12233 chart
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23.09.2002 Image Engineering Dietmar Wueller 15
Visual analysis from ISO 12233 chart
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Visual analysis from ISO 12233 chart
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Problem:
• Where to draw the line for a limiting resolution?!
Visual analysis from ISO 12233 chart
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23.09.2002 Image Engineering Dietmar Wueller 18
Visual analysis from a special chart
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Problem:
• Where to draw the line for a „limiting resolution“?!
• no differentiation between center and edges.
Visual analysis from a special chart
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23.09.2002 Image Engineering Dietmar Wueller 20
Visual analysis from a special chart
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23.09.2002 Image Engineering Dietmar Wueller 21
Using Siemens stars
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Conclusions
• SRF analysis is the preferred method if we have access to „raw“ data.
• If we do not have raw data a visual analysis consists of a low accuracy.
• A more reliable „calculation“-method is needed for consumer cameras.
• Such a method can be based on Siemens stars.