Date of download: 6/3/2016 Copyright © 2016 SPIE. All rights reserved. Block diagram of the proposed regional PIFS-based contrast enhancement method. Figure Legend: From: Image contrast enhancement through regional application of partitioned iterated function systems J. Electron. Imaging. 2013;22(1): doi: /1.JEI

Date of download: 6/3/2016 Copyright © 2016 SPIE. All rights reserved. Contrast enhancement of a dental radiograph (a), by applying, (b) the regional PIFS method, (c) contrast stretching, (d) cubic unsharp masking, and (e) CLAHE. Figure Legend: From: Image contrast enhancement through regional application of partitioned iterated function systems J. Electron. Imaging. 2013;22(1): doi: /1.JEI

Date of download: 6/3/2016 Copyright © 2016 SPIE. All rights reserved. Contrast enhancement of a generic image (Lena) (a), by applying, (b) the regional PIFS method, (c) contrast stretching, (d) cubic unsharp masking, and (e) CLAHE. Figure Legend: From: Image contrast enhancement through regional application of partitioned iterated function systems J. Electron. Imaging. 2013;22(1): doi: /1.JEI

Date of download: 6/3/2016 Copyright © 2016 SPIE. All rights reserved. Contrast enhancement of a dental radiograph, which had its contrast manually reduced by 50% (a). The enhanced images were produced using (b) the regional PIFS method, (c) contrast stretching, (d) cubic unsharp masking, and (e) CLAHE. Figure Legend: From: Image contrast enhancement through regional application of partitioned iterated function systems J. Electron. Imaging. 2013;22(1): doi: /1.JEI

Date of download: 6/3/2016 Copyright © 2016 SPIE. All rights reserved. Contrast enhancement of a mammograph (a), by applying, (b) the regional PIFS method, (c) contrast stretching, (d) cubic unsharp masking, and (e) CLAHE. Figure Legend: From: Image contrast enhancement through regional application of partitioned iterated function systems J. Electron. Imaging. 2013;22(1): doi: /1.JEI

Date of download: 6/3/2016 Copyright © 2016 SPIE. All rights reserved. Extracted edges of the mammographs shown in Fig. 4. The images were inverted, after applying a Sobel edge detector on (a) the original unenhanced image and the enhanced images produced by applying (b) the regional PIFS method, (c) contrast stretching, (d) cubic unsharp masking, and (e) CLAHE. Figure Legend: From: Image contrast enhancement through regional application of partitioned iterated function systems J. Electron. Imaging. 2013;22(1): doi: /1.JEI

Date of download: 6/3/2016 Copyright © 2016 SPIE. All rights reserved. Effects of changing the domain and range region detection thresholds. (a) Thresholds calculated automatically from Eq. (1), (b) small thresholds: over-segmentation, and (c) large thresholds: under-segmentation. Figure Legend: From: Image contrast enhancement through regional application of partitioned iterated function systems J. Electron. Imaging. 2013;22(1): doi: /1.JEI

Date of download: 6/3/2016 Copyright © 2016 SPIE. All rights reserved. Relation of the proposed method’s execution time to the region growing thresholds used for segmenting the image into domain and range regions. Figure Legend: From: Image contrast enhancement through regional application of partitioned iterated function systems J. Electron. Imaging. 2013;22(1): doi: /1.JEI

Date of download: 6/3/2016 Copyright © 2016 SPIE. All rights reserved. Contrast enhanced image, using the proposed regional PIFS method, for (a) λ=0.45, (b) λ=1, (c) λ=2.1, and (d) λ=5. Figure Legend: From: Image contrast enhancement through regional application of partitioned iterated function systems J. Electron. Imaging. 2013;22(1): doi: /1.JEI

Date of download: 6/3/2016 Copyright © 2016 SPIE. All rights reserved. Performance of the proposed method, when varying the value of γ used for decoding. Figure Legend: From: Image contrast enhancement through regional application of partitioned iterated function systems J. Electron. Imaging. 2013;22(1): doi: /1.JEI