OpenCV c++ code for mexican hat operator

Question

Can any one help me to find the Open CV c++ code for Mexican hat operator. I need the code for detecting the license plate. Please help me.

score 2 · Answer 1 · answered Apr 22 '14 at 10:27

You can obtain a LoG (Mexican Hat) -filtered image by decomposing the operation as:

Mat mhFiltered; // resulting (MHat-filtered image)
Mat gaussianBlurredImage;
GaussianBlur(image, gaussianBlurredImage,Size(5,5),1.5); // First apply the gaussian operator
Laplacian(gaussianBlurredImage,mhFiltered,CV_32F,3); // Then the Laplacian

Notice that the parameters of GaussianBlur and Laplacian will alter the final result. Read the OpenCV reference to learn how they work!

score 1 · Answer 2 · edited May 12 '16 at 00:19

1

It's simpler to use Difference of Gaussians (DoG) filter it is an approximation of Mexican Hat filter. And it's just a difference of two images blurred with different sigmas.

edited May 12 '16 at 00:19

Ginés Hidalgo

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answered Apr 22 '14 at 10:29

Andrey Smorodov

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OpenCV c++ code for mexican hat operator

2 Answers2