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An algorithm is described for measuring the subjective, visual impact of 1-D defects (streaks and bands) in prints. A general approach to measurements of spatially localized image defects is described, attempting to directly match three stages of processing by the human observer: formation of the perceived image, identifi- cation of individual defects, and pooling of the visual defect magni- tudes into an overall assessment. The emphasis of the discussion is on the method of pooling of multiple streaks and band defects. It is demonstrated that the commonly used Minkowski pooling method does not satisfy the basic criteria necessary for this application, and a tent-pole pooling method is defined and analyzed. A complete algorithm for measuring streaks and bands, which uses tent-pole pooling, is described. The performance of the algorithm is demon- strated by comparison to results from new and independently col- lected subjective ratings. © 2010 SPIE and IS&T.

Tent-pole spatial defect pooling for prediction of subjective quality assessment of streaks and bands in color printing