Xingdong Li

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Among various kinds of image denoising methods, the Perona–Malik model is a representative Partial Differential Equation based (PDE-based) algorithm which effectively removes the noise as well as having edge enhancement simultaneously through anisotropic diffusion controlled by the diffusion coefficient. However, the unstable behavior of the Perona–Malik(More)
Based on deducing the gain error's formula of noninverting amplifier, MathCAD was used to analyze the influences of real opamp's nonideal parameters. Result shows: For the modern opamps whose open-loop gain is larger than 120dB, the optimal value of feedback resistance Rf can be settled in a very wide range which is 3–5 orders of magnitude, but Rf(More)
A major goal of vaccines is to induce functional immune memory, and efforts to improve the efficacy of vaccines targeting memory CTLs have revealed an important immunoregulatory role of rapamycin, a specific mTOR inhibitor. While inflammatory cytokines are critical for memory CTLs formation, it is unknown if cytokines such as IL-12 mediate rapamycin's(More)
Depth Cameras are widely used in mobile robotics recently. Combining two frames is the key step to construct a complete 3D map, and the relative pose between two views w.r.t two frames is needed. 3D point pairs are necessary for computing 6DOF pose transformation. In this paper, a method for finding correspondences of two point clouds is proposed, and the(More)
3D point cloud is the original format of three dimensional map for the navigation of mobile robotics. Time of Flight camera can directly return 3D points and grayscale image simultaneously, but the color information is lost. In this paper, 3D points are colored by calibrating PMD camera with RGB camera, and then the RGB image is generated with respect to a(More)
Reports a method of design low-pass filter. Based on analyzing the error isogram of the Voltage-controlled Voltage Source(VCVS) 2nd-order Low-pass filter's parametric equation by MathCAD, the paper put forward that VCVS unit gain Butterworth f0 Hz Low-pass filter optimal design plan: firstly, select two capacitances C1 and C2, making C2/C1 0.5; and then(More)
If the complicated system wants to be good running, it should have a stable initial condition. The function of checking hidden danger information system of the coal mine's production in the accident control becomes more and more important. Taking tunneling waking face, we established the checking hidden danger information flow by stages, based on systems'(More)