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Fast Adaptive Bilateral Filtering of Color Images

Abstract: 

The bilateral filter is popularly used for image enhancement. By using a range kernel along with a spatial kernel, the filter is able to smooth images without excessive blurring of edges. It has been shown that the enhancement capacity of the filter can be boosted by adapting the width of the range kernel at each pixel. A fast algorithm for grayscale images was recently proposed for this so-called adaptive bilateral filter, which is otherwise computationally expensive. This can trivially be extended for color filtering using channelwise processing. However, developing an efficient algorithm that can exploit correlations between color channels is not straightforward. We show that such a fast algorithm can be developed by first expressing the filtering in terms of the local histogram and then approximating the latter by an uniform distribution. The distribution in question is along the direction of maximum variance in the RGB space, which we compute from the local covariance (this is done efficiently using power iterations). The local covariances in turn are computed using fast convolutions. To demonstrate the effectiveness of our fast algorithm, we apply it for sharpening, detail enhancement, and deblocking.

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Paper Details

Authors:
Ruturaj G. Gavaskar, Kunal N. Chaudhury
Submitted On:
19 September 2019 - 5:58am
Short Link:
Type:
Presentation Slides
Event:
Presenter's Name:
Kunal N. Chaudhury
Paper Code:
1503
Document Year:
2019
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[1] Ruturaj G. Gavaskar, Kunal N. Chaudhury, "Fast Adaptive Bilateral Filtering of Color Images", IEEE SigPort, 2019. [Online]. Available: http://sigport.org/4718. Accessed: Aug. 07, 2020.
@article{4718-19,
url = {http://sigport.org/4718},
author = {Ruturaj G. Gavaskar; Kunal N. Chaudhury },
publisher = {IEEE SigPort},
title = {Fast Adaptive Bilateral Filtering of Color Images},
year = {2019} }
TY - EJOUR
T1 - Fast Adaptive Bilateral Filtering of Color Images
AU - Ruturaj G. Gavaskar; Kunal N. Chaudhury
PY - 2019
PB - IEEE SigPort
UR - http://sigport.org/4718
ER -
Ruturaj G. Gavaskar, Kunal N. Chaudhury. (2019). Fast Adaptive Bilateral Filtering of Color Images. IEEE SigPort. http://sigport.org/4718
Ruturaj G. Gavaskar, Kunal N. Chaudhury, 2019. Fast Adaptive Bilateral Filtering of Color Images. Available at: http://sigport.org/4718.
Ruturaj G. Gavaskar, Kunal N. Chaudhury. (2019). "Fast Adaptive Bilateral Filtering of Color Images." Web.
1. Ruturaj G. Gavaskar, Kunal N. Chaudhury. Fast Adaptive Bilateral Filtering of Color Images [Internet]. IEEE SigPort; 2019. Available from : http://sigport.org/4718