Linearization of Mammograms Using Parameters Derived from Noise Characteristics
暂无分享,去创建一个
A method is proposed for converting digitized mammograms to a normalized representation, in which pixel values are linearly related to the logarithm of x-ray exposure. This method is based on a signal dependent noise model. By exploiting this model unknown parameters of the non-linear response of the film-screen system can be estimated from signal dependence of the image noise. The method was applied to a series of 1372 mammograms acquired over a period of 8 years. Sudden changes in estimated parameters corresponded well with the introduction of new film-screen systems.
[1] Michael Brady,et al. A Representation for Mammographic Image Processing , 1995, CVRMed.
[2] Phillip C. Bunch. Objective imaging characteristics of mammographic screen-film systems , 1996, Medical Imaging.
[3] G. Barnes,et al. Radiographic mottle and patient exposure in mammography. , 1982, Radiology.
[4] Michael Brady,et al. Mammographic Image Analysis , 1999, Computational Imaging and Vision.