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Commission i 
Invited Paper 
Working Group 1 
INTERNATIONAL SOCIETY FOR PHOTOGRAMMETRY 
COMMISSION 1 
Report of Working Group on Image Quality 
XIth Congress - 1968. 
Contents 
1• Summary 
2. Terms of Reference 
3* Scope of Report 
4. Interpretation of Resolution 1.3 
3. General Applications of Transfer Functions in Aerial 
Photography 
6. Specification of Lens Performance by Transfer Functions 
7« Measurement of Lens Transfer Functions 
8. Incorporation of Transfer Function Measurement in 
"Recommendations for Camera Calibration" 
9« Interpretation and Use of Transfer Function Measurements 
LO. Conclusions 
LI. Recommendations 
References 
List of Figures 
Appendices 
1. Composition of Working Group 
2. Definition of Optical Transfer Function and Modulation 
Transfer Function 
3* Conversion of Transfer Functions into Resolving Power via 
Use of Emulsion Thresholds 
4. Interlaboratory Test: Comparative Measurements of Lens 
OTF 
3. Proposed Supplement to "Recommendations for Camera 
Calibration"