Abstract
X-ray image might be corrupted by noise or blurring because of signal transmission or the bad X- ray lens. This paper presents a two-stage shock filter based on Partial Differential Equations (PDE) to restore noisy blurred X-ray image. Shock filters are popular morphological methods. They are used for noise removal, edge enhancement and image segmentation. Our experimental results show that the performances of shock filter are excellent in X-ray image. The peak signal-to-noise ratio (PSNR) values are 38 dB at least in restoring the noisy X-ray image. The sharpness of image’s edges increase in enhancing the blurred X-ray image. Furthermore, this paper proposes a VLSI architecture for accelerating the high-definition (HD) X-ray image (944 p) process. This paper implements the architecture in FPGA. The hardware cost is low because the computation of shock filter is low complex. To achieve the real-time processing specification, this paper uses a 5-series shock filter architecture to implement computation of HD X-ray image. This paper demonstrates a 944 p, 43.1-fps solution on 100 MHz with 133 k gate counts in Design Compiler, and with 2904 logic elements in FPGA.
Highlights
Shock filters are morphological method, and it “shocks” an image iteratively by dilation and erosion to create ruptures at the edge pixels [1]
The performances of removing noise show that the method is much better than median filter, and that the value of peak signal-to-noise ratio (PSNR) and structural similarity (SSIM) is very high in any types of noise
In order to remove noise of X-ray image, we propose an anisotropic diffusion filter, and it’s an adaptive smoothing technique
Summary
Shock filters are morphological method, and it “shocks” an image iteratively by dilation and erosion to create ruptures at the edge pixels [1]. This process makes shock filters applied to edge enhancement and segmentation. An anisotropic diffusion filter [3] has been proposed to remove the noise. The diffusion can remove noise but details of image. Shock filter is applicable to process X-ray image. We propose a restoration method of X-ray im-. (2014) Implementation of Shock Filter for Digital X-Ray Image Processing.
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