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Bilateral filter

About: Bilateral filter is a research topic. Over the lifetime, 3500 publications have been published within this topic receiving 75582 citations.


Papers
More filters
Patent
30 Aug 2006
TL;DR: In this article, a multi-stage method of scaling an input image to form a scaled output image and an apparatus for doing the same, is disclosed, which includes forming pixels of an intermediate image from the input image using edge-directed interpolation in the first stage and output image pixels are computed by interpolating pixels of the intermediate image.
Abstract: A multi-stage method of scaling an input image to form a scaled output image and an apparatus for doing the same, are disclosed. The method includes forming pixels of an intermediate image from the input image using edge-directed interpolation in the first stage. The intermediate image contains pixels of the input image, and interpolated pixels that are formed by interpolating pixels of the input image, using edge-directed interpolation. Output image pixels are computed in a second stage by determining an associated intermediate pixel coordinate of a corresponding pixel in the intermediate pixel coordinates for each output pixel. Output pixels are then computed by interpolating pixels of the intermediate image.

14 citations

Proceedings ArticleDOI
01 Nov 2016
TL;DR: Analysis of performance between Gaussian and bilateral filter in the fetal length shows that by using a bilateral filter, the fetallength achieved quite accurately characterized with a mean error of fetal length is quite small.
Abstract: One step in the image processing is filtering that located in the preprocessing. In the context of fetal analysis on the ultrasound image, filtering is really needed to enhance the quality of ultrasound image. This study conducted analysis of performance between Gaussian and bilateral filter in the fetal length. Peak signal to noise ratio (PSNR) was used to measure the quality of reconstruction the image compression. In case of early pregnancy, fetal analysis is important to determine some disabilities that might cause miscarriage. One indicator parameter for determine the fetal health on the early pregnancy is Crown Rump Length (CRL) or fetal length. Calculation of fetal length was performed with different filter (Gaussian and bilateral) after segmentation carried out. According to the experimental data, using Gaussian filter with kernel 3×3; 5×5; and 7×7, PSNR was achieved consecutively 31 dB, 28 dB, and 27dB. Furthermore, in the same ultrasound image, PSNR is 30 dB when the filter is bilateral. At the same time, fetal length was also counted separately for Gaussian and bilateral filter. The results of mean fetal length were 6.5 cm, 9.9 cm, 9.4 cm for Gaussian filter with kernel: 3×3, 5×5, 7×7 respectively; while the system was obtained fetal length 5.6 cm for bilateral filter. It is seen that by using a bilateral filter, the fetal length achieved quite accurately characterized with a mean error of fetal length is quite small.

14 citations

Patent
Fumio Komatsu1
14 Oct 1988
TL;DR: In this article, an image forming method includes a first step of irradiating a beam onto an object, and using an intensity corresponding to an image area onto which the beam was irradiated as an intensity of a pixel at the center of the image area, and scanning a beam throughout the inspection area of the object to obtain an image within the area as a collection of pixels arranged at intervals smaller than a beam diameter.
Abstract: An image forming method includes a first step of irradiating a beam onto an object, and using an intensity corresponding to an image area onto which the beam was irradiated as an intensity of a pixel at the center of the image area, and scanning a beam throughout the inspection area of the object to obtain an image within the inspection area as a collection of pixels arranged at intervals smaller than a beam diameter; and a second step of assigning a pixel to be processed and neighboring pixels with coefficients in accordance with a beam intensity distribution, multiplying the intensity of each pixel by each assigned coefficient, determining a new intensity of the pixel to be processed in accordance with the sum of respective products, and repeating the new intensity determining process for all pixels necessary to be processed. In the second step, the value of the coefficients for those pixels except on the scanning direction may be reduced. Further, a third step may be provided for linearly-transforming the intensities so as to make the intensities of respective pixels to be distributed within a predetermined range.

14 citations

Journal ArticleDOI
TL;DR: Experimental results have shown that the proposed bilateral filtering based cost aggregation utilising colour statistical classification and similarity measurement within annular blocks reduces the mismatch at depth discontinuous and the computation complexity significantly.
Abstract: The edge-aware bilateral filter has been demonstrated to be effective for preserving depth edges, and disparity maps obtained from Fast Bilateral Stereo (FBS) have enhanced the efficiency of algorithm and the robustness to noise. However, they also lead to a non-perfect localisation of discontinuities. To overcome this issue, a new bilateral filtering based cost aggregation utilising colour statistical classification and similarity measurement within annular blocks is proposed in this study. We have adopted the similarity of histograms evaluated by Earth Mover Distance (EMD) to obtain the raw matching cost in the raised annular block, since histograms are very effective and efficient in capturing the distribution characteristics of visual features. For the weights aggregation, the spatial weight is assumed to be a constant. The colour weight is calculated by using a cluster-mean-value strategy, which is implemented by the local colour histogram. It improves the accuracy in the discontinuous areas. Computation redundancy is reduced by disparity candidate selection using the local minimal relevancy in the corresponding annular blocks. We use the efficiency and accuracy to demonstrate the performance of our proposed method. Experimental results have shown that the proposed method reduces the mismatch at depth discontinuous and the computation complexity significantly.

14 citations

Journal ArticleDOI
TL;DR: The goal is to propose a new low complexity approach to defining spatially variant bilateral structuring functions, starting from the bilateral filtering framework and using the notion of counter-harmonic mean.
Abstract: A current challenging topic in mathematical morphology is the construction of locally adaptive operators, i.e., structuring functions that are dependent on the input image itself at each position. Development of spatially variant filtering is well established in the theory and practice of Gaussian filtering. The aim of the first part (second and third sections) of the paper is to study how to generalize these convolution-based approaches in order to introduce adaptive nonlinear filters that asymptotically correspond to spatially variant morphological dilation and erosion. In particular, starting from the bilateral filtering framework and using the notion of counter-harmonic mean, our goal is to propose a new low complexity approach to defining spatially variant bilateral structuring functions. Then, in the second part (fourth section) of the paper, an original formulation of spatially variant flat morphological filters is proposed, where the adaptive structuring elements are obtained by thresholding the b...

14 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202321
202257
2021116
2020145
2019203
2018204