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Measurements of the modulation transfer function of image displays

Triantaphillidou, Sophie and Jacobson, Ralph E. (2004) Measurements of the modulation transfer function of image displays. Journal of Imaging Science and Technology, 48 (1). pp. 58-65. ISSN 1062-3701

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Official URL: http://www.imaging.org/store/epub.cfm?abstrid=3016...

Abstract

Measurements of the Modulation Transfer Function (MTF) of image displays are often required for objective image quality assessments, but are difficult to carry out due to the need for specialized apparatus. This article presents a simple method for the measurement of the MTF of a sample CRT display system which involves the use of a still digital camera for the acquisition of displayed test targets. Measurements are carried out using, first, the sine wave method, where a number of artificial sine wave images of discrete spatial frequency and constant modulation are captured from a close distance. Fourier techniques are employed to extract the amplitude of the display signal from the resulting macroimages. In a second phase, displayed artificial step edges are captured, and the ISO 12333 SFR (Spatial Frequency Response) Slanted Edge plug-in is used for automatic edge analysis. The display MTF, in both cases, is cascaded from the closed-loop system MTF. The two measuring techniques produced matching results, indicating that under controlled test conditions accurate measurements of the display MTF can be achieved with the use of relatively simple equipment.

Item Type:Article
Research Community:University of Westminster > Electronics and Computer Science, School of
ID Code:1505
Deposited On:09 May 2006
Last Modified:11 Aug 2010 15:30

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