Abstract
Digital Radiography (DR) images obtained by OCD-based (optical coupling detector) Micro-CT system usually suffer from low contrast. In this paper, a mathematical model is proposed to describe the image formation process in scintillator. By solving the correlative inverse problem, the quality of DR images is improved, i.e. higher contrast and spatial resolution. By analyzing the radiative transfer process of visible light in scintillator, scattering is recognized as the main factor leading to low contrast. Moreover, involved blurring effect is also concerned and described as point spread function (PSF). Based on these physical processes, the scintillator imaging model is then established. When solving the inverse problem, pre-correction to the intensity of x-rays, dark channel prior based haze removing technique, and an effective blind deblurring approach are employed. Experiments on a variety of DR images show that the proposed approach could improve the contrast of DR images dramatically as well as eliminate the blurring vision effectively. Compared with traditional contrast enhancement methods, such as CLAHE, our method could preserve the relative absorption values well.
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Citations
Aug 3, 2020·Medical Physics·Qian WangHengyong Yu
May 14, 2019·Journal of X-ray Science and Technology·Xiaojuan DengHongwei Li
May 6, 2019·Optics Express·Tianyi LiYanmin Yang
Jul 10, 2019·Journal of X-ray Science and Technology·Xiaojuan DengHongwei Li
Jul 7, 2018·Journal of Synchrotron Radiation·Yanping WangXiaoming Jiang
May 1, 2021·Sensors·Dat NgoBongsoon Kang