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Bilateral filter for Android

asked 2013-07-01 11:37:49 -0500

issey173 gravatar image

Hi I am trying to apply the bilateralFilter function in Android to an image (Mat object) and it seems that doesn't work (it just blur it a little bit). To do so I first convert my bitmap into a Mat with Utils.bitmapToMat(bitmap, mat) (mat type: CV_8UC4). BilateralFilter only accepts 1 or 3 channel Mats so I obtain another Mat without alpha channel (CV_8UC3) called interMat. Then I create an empty Mat with the same size and type than interMat called filterMat. When I make: Imgproc.bilateralFilter(interMat, filterMat, 5, 180, 150) and turn it back into a bitmap is like I made nothing. I have modified the sigmas and distance and also iterate the filtering but I just obtain an image a little blur (always the same, even if I change sigmas).

Can anybody help me with this problem? I have tried everything I know. Thanks in advance

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answered 2013-07-03 16:46:52 -0500

MysticBE gravatar image

I don't see the exact problem, the blurring is what the Bilateral filter does (smoothing the images). Check http://homepages.inf.ed.ac.uk/rbf/CVonline/LOCAL_COPIES/MANDUCHI1/Bilateral_Filtering.html for examples. What did you expect it to do?

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Thank you for your answer. As you can see in the link you provided, I expect it to transform the image to a cartoon-like appearance (if the sigma values are appropiate). The main point of the bilateral filtering is that does not blur the edges (as a gaussian filter). That's the first problem, when I apply the bilateral filtering it blurs the edges. The second problem (and maybe the main one) is that even if I change the sigmas values, the output is always the same.

issey173 gravatar imageissey173 ( 2013-07-23 12:51:10 -0500 )edit

You can follow my tutorial :https://www.ivanjul.com/bilateral-filter-opencv-android/

Ivan Julian gravatar imageIvan Julian ( 2018-09-30 11:22:59 -0500 )edit
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Asked: 2013-07-01 11:37:49 -0500

Seen: 1,644 times

Last updated: Jul 03 '13