Gabor滤波器的不同'theta'返回没有方向的图像 [英] Different 'theta' for Gabor Filter Returns Images with no Orientation

问题描述

我在带有以下 theta 的图片上应用 Gabor过滤器 - {0,45,90,135}。但是得到的图像在相同的方向角下完全相同！

I applied Gabor filter on images with the following theta- {0,45,90,135}. but the resultant images were exactly the same with the same orientation angle!

我预计使用 theta = 90 的Gabor过滤器的结果与 theat = 45的结果不同，但在使用不同 theta 的Gabor滤镜后，我得到的图像没有方向差异！

I expected that the results of applying Gabor filter with theta = 90 will be different in orientation than the one with theat = 45, but after using Gabor filter with different theta, I get images with no difference in orientation!

我是否使用Gabor滤镜错误？因为我希望每个图像根据Gabor滤波器中指定的方向角度具有不同的方向。

Am I using Gabor filter wrong? Because I expect every image to be of different orientation according to the orientation angel specified in the Gabor filter.

我为Gabor滤波器设置的参数如下：

The parameter I set for Gabor filter were as follows:

kernel size = Size(5,5);
theta = {0,45,90,135}
sigma = ,2
type = CVType.CV_32F
lambda = 100
gamma = ,5
psi = 5

代码：

public static void main(String[] args) {

    MatFactory matFactory = new MatFactory();
    FilePathUtils.addInputPath(path_Obj);
    Mat bgrMat = matFactory.newMat(FilePathUtils.getInputFileFullPathList().get(0));
    Mat gsImg = SysUtils.rgbToGrayScaleMat(bgrMat);
    double[] theta = new double[4];
    theta[0] = 0;
    theta[1] = 45;
    theta[2] = 90;
    theta[3] = 135;

    for (int i = 0; i < 4; i++) {
        Mat gaborCoeff = Imgproc.getGaborKernel(new Size(3,3), 2, theta[i], 4.1, 54.1, 0, CvType.CV_32F);
        Mat dest = new Mat();
        Imgproc.filter2D(gsImg, dest, CvType.CV_32F, gaborCoeff);
        ImageUtils.showMat(dest, "theta = " + theta[i]);
    }

}

image_0度：

image_45度：

image_90度：

image_135度：

使用theta = 0,45,90,135应用Gabor后的图像，没有平滑：

推荐答案

问题可能就在这里：

Mat gaborCoeff = Imgproc.getGaborKernel(new Size(3,3), 2, theta[i], 4.1, 54.1, 0, CvType.CV_32F);

我认为它应该是这样的：

I think it should be something like:

Mat gaborCoeff = Imgproc.getGaborKernel(new Size(3,3), sigma, theta[i], lambda, psi, 0, CvType.CV_32F);

我不确定lambda和psi的值。也许您应该尝试使用不同的值查看生成的图像。

And I'm not sure about the values of lambda and psi. Maybe you should try to see the resulting images with different values.

最后，Gabor结果就是你所谓的image_0度，image_45度。即使它们之间没有重大变化，我也会改变参数

Finally, Gabor result is what you called image_0 degree, image_45 degree. Even though there is no significant change between them, I would change the parameters

这篇关于Gabor滤波器的不同'theta'返回没有方向的图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！