FPGA Implementation of the Bilinear Interpolation Algorithm for Image Demosaicking

2009 ◽  
Author(s):  
Ivan Olaf Hernandez Fuentes ◽  
Miguel Enrique Bravo-Zanoguera ◽  
Guillermo Galaviz Yanez
Keyword(s):  
Fpga Implementation ◽  
Interpolation Algorithm ◽  
Bilinear Interpolation

Shadow Removal Using Inpainting and Interpolation Technique

2014 ◽  
Vol 626 ◽  
pp. 32-37 ◽  
Author(s):  
Ajayan Lekshmi ◽  
C. Christopher Seldev
Keyword(s):  
Image Inpainting ◽  
Smooth Transition ◽  
Color Model ◽  
Shadow Removal ◽  
Bilinear Interpolation ◽  
False Color ◽  
Novel Approach ◽  
Reconstruction Quality ◽  
Hsv Color Model ◽  
Interpolation Technique

Shadows are viewed as undesired information that strongly affects images. Shadows may cause a high risk to present false color tones, to distort the shape of objects, to merge, or to lose objects. This paper proposes a novel approach for the detection and removal of shadows in an image. Firstly the shadow and non shadow region of the original image is identified by HSV color model. The shadow removal is based on exemplar based image inpainting. Finally, the border between the reconstructed shadow and the non shadow areas undergoes bilinear interpolation to yield a smooth transition between them. They would lead to a better fitting of the shadow and non shadow classes, thus resulting in a potentially better reconstruction quality.

scholarly journals Study on the Arctic Underwater Terrain-Aided Navigation Based on Fuzzy-Particle Filter

2021 ◽  
Author(s):  
Yanji Liu ◽  
Guichen Zhang ◽  
Zhijian Huang
Keyword(s):  
Particle Filter ◽  
Autonomous Underwater Vehicles ◽  
Arctic Region ◽  
The Arctic ◽  
Bilinear Interpolation ◽  
Low Resolution ◽  
Continuous Map ◽  
Map Resolution ◽  
Navigation Accuracy ◽  
The Arctic Region

AbstractThe ultra-low resolution underwater terrain maps of the Arctic region reduce the localization and navigation accuracy of the underwater vehicle relying on terrain-aided navigation. In this paper, we study the navigation ability of Autonomous Underwater Vehicles (AUVs) under the ultralow-resolution terrain map. Firstly, the low-resolution map is transformed into a continuous map by bilinear interpolation. Then, a Terrain-Aided Navigation (TAN) system based on the Particle Filter (PF) is constructed to estimate the state of AUV position by particles. Particles of a random distribution of fixed variance can effectively track targets. However, a fixed variance distribution is not well adapted to many different situations. To improve navigation accuracy and robustness, fuzzy logic is used to estimate the distribution variance of particles under the current terrain gradient dynamically. The simulation results show that our proposed Fuzzy-PF TAN system is robust under various current disturbance situations. The position error of our system is within a map resolution unit of 500 m.

A comparative study of the methods for calculation of surface elastic deformation

2003 ◽  
Vol 217 (2) ◽  
pp. 145-154 ◽  
Author(s):  
W-Z Wang ◽  
H Wang ◽  
Y-C Liu ◽  
Y-Z Hu ◽  
D Zhu
Keyword(s):  
Surface Deformation ◽  
Contact Problems ◽  
Piecewise Constant Function ◽  
Bilinear Interpolation ◽  
Numerical Accuracy ◽  
Piecewise Constant ◽  
Computation Efficiency ◽  
Influence Coefficients ◽  
Grid Points

A fundamental issue of lubrication analysis is the calculation of surface deformation, which includes two major steps: determination of influence coefficients and multiplication and summation. There are various interpolation schemes, such as the bilinear interpolation, the piecewise constant function or Green's function, available for determining the influence coefficients, while the summation operation may be performed by using one of the following methods: direct summation (DS), multilevel multi-integration (MLMI) or the discrete convolution and fast Fourier transform (DC-FFT) method. To limit the periodical errors, the proper way to implement the DC-FFT method is described in detail. The computation efficiency and numerical accuracy are compared by applying the different methods to typical contact problems. The results show that the three methods can achieve comparable numerical accuracy, but the DC-FFT method shows much higher computation efficiency than the others, especially when a great number of grid points are involved. It is concluded that the DC-FFT method has great potential in applications to the numerical analysis of, for example, surface deformations and temperature rises.

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