Fractal Analysis of Periapical Bone from Lossy Compressed Radiographs: A Comparison of Two Lossy Compression Methods

The aim of the study was to evaluate the effect of two lossy image compression methods on fractal dimension (FD) calculation. Ten periapical images of the posterior teeth with no restorations or previous root canal therapy were obtained using storage phosphor plates and were saved in TIF format. The...

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Published in:Journal of digital imaging 2011-12, Vol.24 (6), p.993-998
Main Authors: Baksi, B. Güniz, Fidler, Aleš
Format: Article
Language:English
Subjects:
Alveolar Bone Loss - diagnostic imaging
Analysis of Variance
Bones
Compressed
Compressing
Data Compression - methods
Fractal analysis
Fractals
Humans
Image compression
Imaging
In Vitro Techniques
JPEG encoders-decoders
Mandible
Mathematical analysis
Medicine
Medicine & Public Health
Radiography, Dental, Digital - methods
Radiology
Radiology Information Systems
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description The aim of the study was to evaluate the effect of two lossy image compression methods on fractal dimension (FD) calculation. Ten periapical images of the posterior teeth with no restorations or previous root canal therapy were obtained using storage phosphor plates and were saved in TIF format. Then, all images were compressed with lossy JPEG and JPEG2000 compression methods at five compression levels, i.e., 90, 70, 50, 30, and 10. Compressed file sizes from all images and compression ratios were calculated. On each image, two regions of interest (ROIs) containing healthy trabecular bone in the posterior periapical area were selected. The FD of each ROI on the original and compressed images was calculated using differential box counting method. Both image compression and analysis were performed by a public domain software. Altogether, the FD of 220 ROIs was calculated. FDs were compared using ANOVA and Dunnett tests. The FD decreased gradually with compression level. A statistically significant decrease of the FD values was found for JPEG 10, JPEG2000 10, and JPEG2000 30 compression levels ( p  
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Güniz ; Fidler, Aleš</creator><creatorcontrib>Baksi, B. Güniz ; Fidler, Aleš</creatorcontrib><description>The aim of the study was to evaluate the effect of two lossy image compression methods on fractal dimension (FD) calculation. Ten periapical images of the posterior teeth with no restorations or previous root canal therapy were obtained using storage phosphor plates and were saved in TIF format. Then, all images were compressed with lossy JPEG and JPEG2000 compression methods at five compression levels, i.e., 90, 70, 50, 30, and 10. Compressed file sizes from all images and compression ratios were calculated. On each image, two regions of interest (ROIs) containing healthy trabecular bone in the posterior periapical area were selected. The FD of each ROI on the original and compressed images was calculated using differential box counting method. Both image compression and analysis were performed by a public domain software. Altogether, the FD of 220 ROIs was calculated. 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subjects Alveolar Bone Loss - diagnostic imaging
Analysis of Variance
Bones
Compressed
Compressing
Data Compression - methods
Fractal analysis
Fractals
Humans
Image compression
Imaging
In Vitro Techniques
JPEG encoders-decoders
Mandible
Mathematical analysis
Medicine
Medicine & Public Health
Radiography, Dental, Digital - methods
Radiology
Radiology Information Systems
title Fractal Analysis of Periapical Bone from Lossy Compressed Radiographs: A Comparison of Two Lossy Compression Methods
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