Denoising Algorithm for Dynamic Digital X-ray Image Sequences and Its Fast Implementation
Dongbo Wei · Acta Armamentarii · 2011
In order to realize the fast noise reduction in the dynamic digital radiography(DR) imaging system,the system's noise characteristics and the disadvantages of the original NL-means denoising algorithm were studied.An improved NL-means noise reduction algorithm was proposed.Meanwhile,in order to solve its calculation complexity problem,graphic processing unit(GPU) was applied to make use of its high parallel and fast floating-point calculation abilities.In the implementation,the image was mapped to the GPU's texture and multi-thread parallel calculation was adopted.The experimental results showed that the improved NL-means noise reduction algorithm could effectively restrain the quantum noise and improve the resolution of DR image sequences.In addition,the acceleration with GPU could realize the real-time denoising without the loss of image information.