Sharpness Matching between Digital Image Display Devices

HANEISHI Hideaki1), OHTAKE Ritsuko1), TSUMURA Norimichi1), MIYAKE Yoichi1), HUNG Po?Chie2), ROEHRIG Hans3), DALLAS William J.3)
 
1) Department of Information and Image Sciences, Chiba University, 1?33, Yayoi?cho, Inage?ku, Chiba, 263?8522 Japan
2) R&D Center, Konica Corporation, No. 1 Sakura?machi, Hino, Tokyo, 191 Japan
3) Department of Radiology, The University of Arizona, Tucson, AZ 85704, USA

Optical Review Vol. 5 No. 3 pp. 163-173(1998).[

Abstract
A method is presented for matching apparent sharpness between digital image display devices with different characteristics. The sharpness is most precisely described by the point spread function (PSF) as opposed to dot density such as DPI (dot per inch). The difference between devices is expressed as difference between transfer functions obtained from the PSFs. In the presented method, spatial frequency filtering for one digital image is carried out where the ratio of the transfer functions or its modified version is used as filter. The modification is introduced as a clipping operation to reduce excessive enhancement when the ratio of the transfer functions has a high pass characteristic with large gain. Through computer simulation including a subjective evaluation experiment and numerical evaluation, the effectiveness of filtering operation for sharpness matching is demonstrated.

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