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Improved Evaluation of Image Resolution for Digital Cameras and Scanners

Several years ago, a method for measurement of image resolution for digital cameras using slanted-edge gradient analysis was adopted by the ISO. More recently, this method has been applied to the spatial frequency response and MTF of film and print scanners and CRT displays. We have previously described several causes of both bias and variation error in terms of the various signal processing steps involved. This analysis, when combined with observations from practical system testing, suggests modifications and extensions to the original method. We review several sources of measurement error and how to avoid them by careful data collection and processing. This involves refinements in data screening for signal encoding problems and improved edge-feature location and slope estimation.