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Medical ultrasound images are low contrast in nature. Information regarding tissues and other important structure is required by a physician to assess patient's health. Therefore image enhancement is a critical pre-processing task. In this paper a methodology based on emerging topic of fractional calculus is proposed. Proposed method is simple yet effective. In the proposed algorithm, input image...
The characteristic of the subband coefficients of the discrete fractional wavelet transform (DFRWT) vary with the change of the order p should be utilized in this paper. The original image is decomposed by DFRWT in different p order near p=1, and the mode subband coefficients have changed slightly with the comparison of DWT(p=1). In order to make the result of image enhancement selective, the paper...
Retinex is a theory on the human visual perception. It explains an object's color is determined by its reflectance. The classic Retinex causes the problems of halo, color distortion and noise, etc. In order to solve these problems, In this paper, we present a algorithm that combining with Nonlinear Image Enhancement and Guided Filter to estimate the reflection components under Retinex frame work....
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