Fractals everywhere
Automatic, adaptive, brightness independent contrast enhancement
Signal Processing
Fractal image compression
Two-dimensional signal and image processing
Two-dimensional signal and image processing
Contrast limited adaptive histogram equalization
Graphics gems IV
A cubic unsharp masking technique for contrast enhancement
Signal Processing
A study on partitioned iterative function systems for image compression
Fundamenta Informaticae - Special issue on image compression
Multidimensional binary search trees used for associative searching
Communications of the ACM
Computer Vision and Image Processing: A Practical Approach Using Cviptools with Cdrom
Computer Vision and Image Processing: A Practical Approach Using Cviptools with Cdrom
Digital Image Processing
Adaptive unsharp masking for contrast enhancement
ICIP '97 Proceedings of the 1997 International Conference on Image Processing (ICIP '97) 3-Volume Set-Volume 1 - Volume 1
Comparative Study of Unsharp Masking Methods for Image Enhancement
ICIG '04 Proceedings of the Third International Conference on Image and Graphics
Integration of iterated function systems and vector graphics for aesthetics
Computers and Graphics
Image coding based on a fractal theory of iterated contractive image transformations
IEEE Transactions on Image Processing
Region-based fractal image compression using heuristic search
IEEE Transactions on Image Processing
Short Communication: Histogram Modified Local Contrast Enhancement for mammogram images
Applied Soft Computing
Medical imaging correction: A comparative study of five contrast and brightness matching methods
Computer Methods and Programs in Biomedicine
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A new algorithm for the contrast enhancement of images, based on the theory of Partitioned Iterated Function System (PIFS), is presented. A PIFS consists of contractive transformations, such that the original image is the fixed point of the union of these transformations. Each transformation involves the contractive affine spatial transform of a square block, as well as the linear transform of the gray levels of its pixels. The transformation of the gray levels is determined by two parameters which adjust the brightness and the contrast of the transformed block. The PIFS is used in order to create a lowpass version of the original image. The contrast-enhanced image is obtained by adding the difference of the original image with its lowpass version, to the original image itself. The proposed algorithm uses a predefined constant value for the contrast parameter, whereas, the parameters of the affine spatial transform, as well as the parameter adjusting the brightness, are calculated using k-dimensional trees. The lowpass version of the original image is obtained applying the PIFS on the original image repeatedly while using a value for the contrast parameter that is lower than the predefined one. Quantitative and qualitative results stress the superior performance of the proposed contrast enhancement algorithm against four other widely used contrast enhancement methods; namely, linear and nonlinear unsharp masking, Contrast Limited Adaptive Histogram Equalization and Local Range Modification.