in X-Ray Digital Image
Lin Gang,Zhang Feng,Zhang Dengfu,Jiang Dazong
(School of Life Science and Technology,Xi'an Jiaotong Univercity 710049,China)
Abstract:Experiment shows that the light field of the X-ray digital image is in paraboloidal distribution.A practical algorithm based on the least mean square (LMS) algorithm for the correction of X-ray digital image is proposed.Firstly, the average gray level of the highlight region in the empty image is used as a referential value, and all the pixels in the empty image are multiplied by the corresponding coefficient to get the referential value.Then, a paraboloidal function is adapted to fit the coefficient image and to make the correction operator.Eventually, the correction operator is applied to correct the objective image. It is shown that the operator generated by this algorithm is stable and reliable, and it can correct the non-uniform illumination in the objective image without increasing the noise.
Keywords:X-ray;digital image;light field correction