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Grading, image analysis, and stereopsis of digitally compressed fundus images.
Retina. 2000; 20(3):275-81.R

Abstract

PURPOSE

To investigate the effects of image digitization and compression on the ability to identify and quantify features in color fundus photographs.

METHODS

Color fundus photographs were digitized as tagged image file format (TIFF) and high-compression (80:1) and low-compression (30:1) joint photographic experts group (JPEG) images. Rerendered images were subjected to standard grading protocols developed for a clinical trial, and digitized images were subjected to image analysis software for drusen identification and quantitation. Re-created stereoscopic images were compared subjectively with originals.

RESULTS

Original, TIFF, and low-compression (30:1) JPEG images were virtually indistinguishable when subjected to close scrutiny with magnification. The overall quality of high-compression (80:1) JPEG images and images digitized at 500 dots per inch was markedly reduced. Protocol grading of original and digitized images was highly concordant within the repeatability of multiple grading of original images. The area subtended by drusen differed by less than 1.0% for all uncompressed and compressed image pairs quantified. Stereoscopic information was accurately preserved when compared with originals for TIFF and low-compression JPEG images.

CONCLUSIONS

Fundus images can be digitized and stored with significant compression while preserving stereopsis and image quality suitable for quantitative image analysis and semiquantitative grading. Low-compression (30:1) JPEG images may be suitable for archiving and telemedical applications.

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Authors+Show Affiliations

Lee MS
Computer Vision Laboratory, Scheie Eye Institute, University of Pennsylvania School of Medicine, Philadelphia 19104, USA.
Shin DS
No affiliation info available
Berger JW
No affiliation info available

MeSH

Depth PerceptionFundus OculiHumansImage Processing, Computer-AssistedRetinal DrusenTelemedicine

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, P.H.S.

Language

eng

PubMed ID

10872933

Citation

Lee, M S., et al. "Grading, Image Analysis, and Stereopsis of Digitally Compressed Fundus Images." Retina (Philadelphia, Pa.), vol. 20, no. 3, 2000, pp. 275-81.
Lee MS, Shin DS, Berger JW. Grading, image analysis, and stereopsis of digitally compressed fundus images. Retina. 2000;20(3):275-81.
Lee, M. S., Shin, D. S., & Berger, J. W. (2000). Grading, image analysis, and stereopsis of digitally compressed fundus images. Retina (Philadelphia, Pa.), 20(3), 275-81.
Lee MS, Shin DS, Berger JW. Grading, Image Analysis, and Stereopsis of Digitally Compressed Fundus Images. Retina. 2000;20(3):275-81. PubMed PMID: 10872933.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Grading, image analysis, and stereopsis of digitally compressed fundus images. AU - Lee,M S, AU - Shin,D S, AU - Berger,J W, PY - 2000/6/29/pubmed PY - 2000/9/30/medline PY - 2000/6/29/entrez SP - 275 EP - 81 JF - Retina (Philadelphia, Pa.) JO - Retina VL - 20 IS - 3 N2 - PURPOSE: To investigate the effects of image digitization and compression on the ability to identify and quantify features in color fundus photographs. METHODS: Color fundus photographs were digitized as tagged image file format (TIFF) and high-compression (80:1) and low-compression (30:1) joint photographic experts group (JPEG) images. Rerendered images were subjected to standard grading protocols developed for a clinical trial, and digitized images were subjected to image analysis software for drusen identification and quantitation. Re-created stereoscopic images were compared subjectively with originals. RESULTS: Original, TIFF, and low-compression (30:1) JPEG images were virtually indistinguishable when subjected to close scrutiny with magnification. The overall quality of high-compression (80:1) JPEG images and images digitized at 500 dots per inch was markedly reduced. Protocol grading of original and digitized images was highly concordant within the repeatability of multiple grading of original images. The area subtended by drusen differed by less than 1.0% for all uncompressed and compressed image pairs quantified. Stereoscopic information was accurately preserved when compared with originals for TIFF and low-compression JPEG images. CONCLUSIONS: Fundus images can be digitized and stored with significant compression while preserving stereopsis and image quality suitable for quantitative image analysis and semiquantitative grading. Low-compression (30:1) JPEG images may be suitable for archiving and telemedical applications. SN - 0275-004X UR - https://www.unboundmedicine.com/medline/citation/10872933/Grading_image_analysis_and_stereopsis_of_digitally_compressed_fundus_images_ L2 - https://Insights.ovid.com/pubmed?pmid=10872933 DB - PRIME DP - Unbound Medicine ER -